bureau of mineral resources, geology and ...bureau of mineral resources, geology and geophysics...

BUREAU OF MINERAL RESOURCES, GEOLOGY AND GEOPHYSICS

RECORD

RECORD 1986/24

YEURALBA REGION, NORTHERN TERRITORY; DATA RECORD OF 1:100 000

SCALE MAPPING

R.S. NEEDHAM, P.G. STUART-SMITH & L. BAGAS

BMR Pl'''"';-r: ,~~.·-':S ':"1 ~: ': .. C'lU~ '- (LEi 'L .. ;- 'J S-L --v:-)

The information contained in this report has been obtained by the Bureau of Mineral Resources, Geology and Geophysics as part of the policy of the Australian Governme"t to assist in the exploration and development of minerel resources. It may not be published in any form or used in a company prospectus or statement without the permission in writing of the Director.

RECORD 1986/24

YEURALBA REGION, NORTHERN TERRITORY; DATA RECORD OF 1:100 000

SCALE MAPPING

R.S. NEEDHAM, P.G. STUART-SMITH & L. BAGAS*

*NORTHERN TERRITORY GEOLOGICAL SURVEY

I

ABSTRACT

INTRODUCTION

GEOLOGY

REFERENCES

TABLES

APPENDICES

FIGURES

1.

2.

1.

2.

1.

2.

3.

4-19.

(i)

CONTENTS

Summary of stratigraphy of the Yeura1ba

region (Cainozoic units omitted)

Changes in stratigraphic nomenclature

in the Yeuralba region.

Age determination sampling sites

Petrographic descriptions

Locality map

Generalised geology

Geological reference and index to

compilation sheets.

1:100 000 reductions of the 1:25 000 - scale

compilation sheets, and thin section

localities

1

3

5

16

49

52

53

54

2

4

7

17

-1-=

ABSTRACT

This record summarises the results of 1982-3 fieldwork by

the Pine Creek Geological Party (BMR and NTGS) in the Eva Valley,

Maranboy and Waterhouse 1:100 000 Sheet areas. Reductions

to 1:100 000 - scale of the 1:25 000 - scale compilation sheets,

petrographic descriptions of selected samples, and a list of age

determination sampling sites, are enclosed.

The area contains mostly Early Proterozoic rocks.

Moderately folded Tollis Formation (El Sherana Group) is intruded

by Maud Dolerite and Maranboy Porphyry. These units are

unconformably overlain by Hindrance Creek Sandstone and Plum Tree

Creek Volcanics of the Edi th River Group in which a large

subvolcanic intrusion, the Grace Creek Granite, is developed.

The El Sherana Group is intruded by the Eva Valley and Yeuralba

Granites, and these granites may also post-date the Edith River

Group. Middle Proterozoic rocks of the Kombolgie Formation rest

unconformably on older rocks and form dissected sandstone

plateaux in the west and east. Gently dipping sandstone and

basal t in the south mark the edge of the Paleozoic Daly River

Basin, and thin horizontal Mesozoic sediments form tablelands

over much of the south and southeast.

130°30'

'''l

) REYNOLDS.

RIVER ;

,r ......... ../--I

I I

/ 1''''-

I

1 ......... -- .......

/ TIPPERARY .. ~. {DALY

- __ ~1RIVER Daly River /' - - \

-2~

132"00'

\ McKINLAY

~lVER \\ I~ ,"'

\~ \\ ,<

i"

"\~ ~r /'-' '". ",-' /~~/ .

RAN FORD HILL l.

I \\

I I r

13330' 12'00'

\ I \ I _----

\,OENPELLI

HOWSHIP

GILRUTH

~

I I

~ SNOWDROP

/ \ // faj~\/_ .J .' '

r ' 1,,,---

I----r----~,-I-----\~~~-----_t----------~_r------~ .. -~-.--~------~----+_~------+_~ '0 14'00'

)'

WINGATE MOUNTAINS ...-/~

BARWOLLA

'~

'" \.. JINDUCKIN!

FLORA

(

"

j

\

\ WATERHOUSE

) /e\

-~ \\\-'

'---------'--~---'-----'----'----'---L------!.----'--L-------.L-.-Il!--=~O=--_ _..J15°00·

NORTHERN

TERRITORY

Q

Alice Spungs

• I 1 _______________ '

Record 1986/24

50 I

100 I

KATHERINE 1.'100000 Sheet area

D Area covered in Figure 2

150 km I

Figure 1. Locality map of the Yeuralba region

16/053-9/33

-3-

INTRODUCTION

This record summarises the major results of the 1982-3 field

work of the Pine Creek Geosyncline Geological Party of the Bureau

of Mineral Resources (BMR) and the Northern Territory Geological

Survey (NTGS) in the Eva Valley, Maranboy and Waterhouse

1:100 000 Sheet areas. The work was a continuation of geological

fieldwork in the Pine Creek Geosyncline, as part of the Pine

Creek Project, whose overall objective is to study the geology,

geophysics, and mineralisation of the geosyncline; an important

subsidiary objective is to produce 1:100 000 - scale geological

maps of the region. A detailed account of the geology of the

area mapped (the "Yeuralba Region") is in preparation and will be

published in the BMR Map Commentary series.

This record presents 1:100 000 scale reductions (Figs 4-19)

of the 1:25 000 scale compilation sheets, and an outline of the

stratigraphy. Age determination sample sites and petrographic

descriptions are appended.

The location of the area is shown in Figure 1. Colour

airphotos at 1:25 000 - scale were used, in conjunction with

1:89 000 - scale panchromatic airphotos. Figure 3 contains the

geological reference and an index to the compilation sheets.

Copies of the compilation sheets at 1:25 000 original photoscale

can be obtained from the Copy Service, Australian Government

Printer (Production), P.O. Box 84, Canberra, ACT 2601 - price on

application.

132 30'

MESOZOIC

LOWER PALAEOZOIC

MIDDLE PROTEROZOIC

EARLY PROTEROZOIC

-4-

133 00 14 00'

III 1\ .'0 km

dyke

fault

14 30 , lamt pattern

'" ~ dip and striKe of bedding. Igneous layertny

16 lJ53·g 14 Cretaceous

J,nriare Sandstone

Anl"m Plateau VolcaniCS

~"''''

:; 1\ .:: ....

Kambolgle Formation McAddens Creek VolcaniC Member

~

~+ +

.".' " •. D. ~:"

Plum Tree Creek Volcan1cs

Grace Creek C;rClnltp.

HlI1drance Creek Sandstone

~

~ Eva Valley Granite Figure 2, Solid geology of the Yeuralba region

Yeuralba Granite

Maranboy Porphyry

Maud Dole"te

D TalliS Formation Record 1986/24

-5-

The field positions of specimens described petrographically

are shown on topographic bases accompanying each compilation

sheet, as 8-digit BMR sample submission numbers.

About 700 field observations points were occupied over the

2700 km< area, representing an average density of about I per

4 km<; the density is about 1 per 1.7 km< in areas of Early

Proterozoic rocks.

GEOLOGY

Generalised geology is shown in Figure 2, and the

stratigraphy is summarised in Table 1. Changes from previous

stratigraphic nomenclature are listed in Table 2.

The region is dominated by extensive tablelands of Mesozoic

sediments which cover much of the southern half, and by plateaux

of subhorizontal Middle Proterozoic Kombolgie Formation sandstone

in the west and northeast (Fig. 2). The lower lands are mainly

gently undulating plains and hills with local rugged areas which

form parts of the upper Katherine River, King River and Maranboy

Creek catchments. Mesozoic sediments lie over warped to

moderately folded sediments (Tollis Formation and Hindrance Creek

Sandstone), volcanics (Plum Tree Creek Volcanics), and intrusive

rocks (Maud Dolerite, Maranboy Porphyry, Yeuralba Granite, Eva

Valley Granite, Grace Creek Granite) of Early Proterozoic age.

-6-

Sandy and black soil plains in the extreme south overlie

subhorizontal sandstone and basalt (Jindare Sandstone and Antrim

Plateau Volcanics) of Lower Palaeozoic age.

The Palaeozoic rocks lie at the edge of the Daly River Basin

which extends south and west of the region, and the Middle

Proterozoic rocks lie at the base of the McArthur Basin sequence,

developed mainly to the east. The Early Proterozoic, rocks form

part of a dominantly felsic volcanic suite which is intermediate

in age between the older and unconformably separated Early

Proterozoic Pine Creek Geosyncline sequence, and the Middle

Proterozoic McArthur Basin sequence.

Walpole and others (1968) briefly described the geology of

the area as part of a reconnaissance survey of the Katherine

Darwin region. Significant changes to their stratigraphy

include:

1. The outer parts of the Walpole and others' Grace Creek

Granite consist of ignimbrite, continuous with ignimbrite of

the Plum Tree Creek Volcanics of the stow region further

north. (Needham & Stuart-Smith, 1985).

2. The Grace Creek Granite is less extensive than mapped

previously, and consists of a zoned mass of microgranite and

granite. It is lithologically very similar to the

surrounding ignimbrite, the distinction being made on

differences in groundmass grain size, and the presence of

feldspar xenocrysts in the intrusive rocks.

Of a. Czl a.

P _ C" C,I Q,

~ 0..' Cz Il.s .... .---+--.-;"'-+--1 01

~S:C..-s~ 2 I ScT.! K c, ~ CIS

S.se.rr'ltnt me.t.sedlmen~5. volcanics. g,..nite . Cd ________ ...JI- ezl

---, "1 ~ _. n----"""i~l "z

K, ~~~~~~~~~~~~~~~~~~

';,w,i I ~;:, 1 CI" ill~l,

£!·'I . ".

J,nd.tte

Ant,,," Pl,tuu VolunlCJ ~ S,ndstone £1.

SlH.",ntl. c/~, 'red,nd ritler IIl/vlI'-urn

Une(lns(llltl~/lti Nnt/. ou"~a$" .n -1 collu,,/um

4JJc# t1ntI In»wn lI,!lTUc ,rt:Y14 #ncI cI~p

wI, rIlDIJ'-. ,un"" regolilh oDscurin9 kdrrxic

F~~rCl;mluol/.s dnd drlY'f .una'

.f~"'dsl("'1 .mtI wl"M~,.,tI /ItI/(:ln,c rq6j/~ . t;J/us lind' .sera

NtJtlulrlr, .,ncr,I',onrlry dna PIStlll"!i. I.f~r"e

1J"ItJ'"IId,d 1111. wlllk frlntlslone '1tllDIIII ~ntl Mown ~,,.roJr,n"l#I "iI. til m.t!,um-,flinett. .. I'r~"I. undslQn" IInlmdlt .whd. /tl I""" • .!~nd,J'on •• ",.n", n,l-lN'own "If,fon6; losSJ.'I,'nlJ~ 111 p..iC~ "/~/)It! /JI':h#/7 /~rrt/.9lnllu.l m.t/lum -9,,,,nea Nntlsl.nd Wh"~ "'~',vA1- eOt/rJ. Ir.Dli",lte IU6rlz .Nntlsftme

Jnd""t/u/ .'.~.?e .-0 CNrS •. Nllif. ·pu'pl. -/JrG,.,n stNIdsIGn •• !JncCl~f~tI ,Iu,' .• ,,0' ;rkD,$~ .~I1~ .. " curJ~, ...,11- Jorktl ,.h'/, ;",jb/# J~ntlsIDn~

II",k to :J"rp'4 .'rNu!I,ntJus poorlf .u".t,a undslon •• p.6~1y Fr'.~/. 8ko.,. .1.",it'l~/." ~hul :o", . ."onl, ""ecl.lld Jnt/ "mtJnil,c Purple 'b 4IdCK. "m",tJ/1/, w~Jtl"r,d . lin, ~.s./I. ",.lIclIl.r ,n p/~us. Minor ,,,t ;,r;"yl"o~" 77'.Q;'um -~r.m,d II """r.Jd Nnd.sitJn« tnllrlJ,tls n.~r MJ« in pldC~S

.... t.D~ I I ~ ~I ~u, g... P",A tPlti ",,~,." '-'Jil' fU.HIZ AIMs/on,

#'\JVV'V'\JV"\,7 'I'rv'V'\JV'V\IV? V'V'\IV"\IV'V"\I'\.

w~[~~==~~::::::::====~~~~ ______________________________________________ ~~~~~, !~ ?".:r.!_ .• ";)".. w" --y.;. ",,,,ens ':,eelll 'tol,.",c Me"..b .. r ~hm ~::i : Kom bolg ,e fo,m.t,o. IhM. en._

x~~------------------------------------------------------~-----------------------------1

'" w ~ ... k" o x"' .... ii ...

U mb.,

Plum Tree C,.ewk 1.lein'(5

--:;t ~.nny Rhyoht.. Pep,

~---fep

""", .. """

"","d,."ce Creek SOI",utone

I,," '- )

E'V~_.l!!.!.!tv tCl __

Gunl tc

eg'd I !g', I '1'.

M".nb0l' #orphy,y !rnp I

!.~.

\.. '°9> rege',,--...... '\ 6r.ce "\ Cre~k \ Granite

\(~\ r;:;"". "\

eog.

'l ..... '.lb. ~r4:\·te

ell

r Mlud" O.ltnte m]

I Pep

·t"P'f ··~.h

:t,~ :>

l-::c

P«l4 Pen

e,' !9'd eS~'r

'!I", I" e.,. £dd

; ~

~!I Toll., Fo,m,'"n - L" W vvvv VnetJnlIVMily ~ kc,m" •. ~4.:/I IHIIS 4t1Und~rl

Air" rtf 17~/". ~~ts.'e-h;,ull, IItSICt#.r ID p!;,r" CI1~rI'. cfIm'"tlnly """'y .IN"" "lIlIly .mil d~,tf. wllllt Iu ,,,', .NfUl$llIn4. lI,.own I",U/;ntlus Jillsfone ,nt~,.lm:ls. crrlss'Mddtd' ~ rlpplt - ",<lrk,; ::.::~;:·,w"of.s rlllsf.n. knsts

MJ.J'sIlIt I" ,tJO,4r Itlf"'" -ec 1J' rttltlJSJt·IJ,IIW'1 6ImJIt#lIC #Iul M,nlNrysl,c '9",mlJrJl •• PO. "I". "f'd-!"nk JIKJ fl4J!'p!t rbyoltlt, ".,.t: »nd.slone. -A.-.·.,' .. ,r1u:J:J~¥· J-'oNJ(tllf ·MIf ,,,,", .... I'I U'''I',C~. ",",\,.. ~·C'w 4.J'"ffd JI~rIf ?,,,,t -A!I:J,il.

<I'.':'~. "" .' "'7 JlhtI},.- "'f ~~~\, , .' .' "',n:.t .• :I.,-t: ...... , !',; ,~'",,-q:~ '''~.'J,.n ("til:, II ,

/.-t I" •. , ..•. ,.,. !/".J.'7" "i. 'r~":J.'ti~ J~'qh! I'" p."1f ,,"'i~# !,tin,!.'

~"i"'" Jrl' ... ·,,·'It ,]'~1-1,,~n '711(/.(1,"_ $I'JIIH4 g,.n", .+._;A~ . . 1"( ;.-:A - .;-': ""1.1 oJ - :/1'-lilYd jl'",./Ie '

_. ~"'.' i,C ;/1"1 plnA "', r"f-.#7·~'. 1~1"':I ·n pw,s

!in~ .~. ot/r.re P"""!"1 ,""",,~~i, .I",/ed IMbP.'Ih-c fVJdZ StInt/sf,,.,, ~nt/ ",HIlSd. tv,., l'IIu"",d 'lwdl "UJ,s • ""'>0 ~lIo1(l1 Un'''''.'JI •• ,.tui'''/~/hJ«I' '-. ,v~rfzi;. trri' ;;-...,,~.~ ,,..,,1 (QmjJIeJf.~·""/~d .

Un4111""~t: EN V.II'1 G'Jni4 . !tnt. will;'. ~u/I.pink ~"q ul"'Im i,uc"f,,,nil.

~iwT, ,1tI'phrd,( .l""H JiTotf i'loen MlICtlr-''''t.

1;". hi ",.dtu,,", - ~rJin,q I~AI ,1"1 .. p.r~ p#1A porphfl'll'( 1,,,,11,,.,,,,,1,

41~1I111111 . ,..",a ~ NIlI''''' JlMI #/Ul1rvnuw 1tNt,~1U 4i.I.·I. _'.11'"..,,1" .,I,nsl.,# .I"'se" "'II'rJ/,;;,n

I'tnkuh ."'''''''' -~I'rl' ~"'v/n Lr.Jln~" Itltl.tjIJ' "'~",r, M.tI.u," -.11'11111" .fre) -.1"'" yu;vlz riokril.

,*'.-3ctrtl,tI .Ir',w.,('~ r·.'fH4n'.,.I, p"'~n ,"I,"lltk. "''''tv ~""" 1,,11'

R~cord 1986/24 Figure 3(al. Reference to accompany I: 25 000 compilation sheets of Yeuralba region, NT

- .

t OUA TERNARY 1 ~CAINOioIC i

r TERTIARY I

'1 1 (CRETACEOUS >MESOZOIC

J )

1 L LOWER

CAMBRIAN tPALAEOZOIC

> MIDDLE

i !. : j

PROTEROZOIC

~ PROTEROZOIC , I

EARLY I PROTEROZOIC

I I

r

J

-16/053-9/35

I

" I

Ceolojlcal bOt/nolar!

---+1-~) Anlic/me

--",,*;-~) Sync/me

'Os

fat/It

Norm3! fadt, IlcIr on oIownfhrown JloIe indlcales oIlred,on o( dip

/at/It Jaowiny nd.;/ive lIortionl<11 tliS"pl<1cement U

---""";0;'" fat/If (u. D Indicates relat/vt. movem1nl; t/p. clown)

01 fat/If conlalniny breCCia

fat/If j dl- doluilt. ,e -t:l'dote , 9 -Jreisen, 'l-QU<1rfz , qb - IJllarfz breccia, t'ib -lovrm<1lme 'lvO'riz breCCia

Where lot'olion of bOllndaries, fo/~ anol (dllIlls IS approximate lIne IS broKen; where Inftrretl, ,/"eri8(1 i where cont't.,yled,ooundar/i!s and rold.}' are clolled, MIIII.r 3re shown by .rllor! oItTs/les

Minor syncline

Oray 1'0101

","r_A ___ ~) Fold axis

" Arrow Inol'-ules Irt?f/ol "nol valve !ndlcafes ,olllnIe o( 10101 a)'Is

....-----~..;" Shear zone

-<72

+

8rach yan fiel,ne

StriKe and dip of slrala

flllrlzontal tI!;o

Showlhg proved dlrecllon of f~clhy Sir/ire <7nol dip of strala } . .

SfnJ<.e and dip of over/llrnecl slrala ba.reol on .retl!menfarJ' slrvdvru

strike and tltp of slrala, rilp 50

-IS"

.4 Slrtlre and dtp o( slr"t", tlip j're3ter IlI,in 'IS'

-:- HOrlzont']l slrata

O;f -slole

.---. '---- Trend-lIne

Lineamtnl

airplloto interpretation

Stnlre and dip of joint

_ fed/cal jo/nt

+ HOrizontal joint

-<so Sirike and clip of {o;,ation

.:; Stnke anti dtp of cleal'O'Yt.

/ Jlerlical deaviJge k

05 Sfrike and clip of kink cleavage

..4.15 Sfr/lft and dtp af flow oO'ndlng or Ijneous lamln<1llon

JQ' Yerlic<11 flow banding Or igneous 18m/n81;017

~ Oylre Or veIn ; a - aplde , d 1- daler/liI, f - felsite, 9 - greisen , m - my lonite , q.-Ijllarfz , t -Iovrmakne , +9 - fourmah"ne !Ire/sen, tlj. - tourmalt'ne '1uarlz

, • '60 • Dyke, tldr on tlawnlhrown side indicates glrt.eI/on 01 dtp

'Cu

.. ~

"*

Macrofossil localilr

Onllho/e, DD -Olamond-drilihofe , PD - Percussion- drillhole GCDDH I - Grace Creek Oiamond-drillholt. No.1

tHlnor mineral occurrence

Abandonetl prosped Eva :falley

Open ad, fuarrr j minor • Abantloned mIne 0

Fence

Homes/ead

8l1dclinS

Yard

"t'o Alluvial worJrings; nof beinj worJr~tI 8. 7hyonomef,,'-cal sfation

• Abandon~d bailer! ·277 Elevafton In metres

>--< Cosfean

Cu- copper, Gg - aggregate o/her than crllshed roclr, Mo - molybdenum, So- Tin, w- lungslen

---=---- Walerhole

*- *- Swamp

Escarpment , 2 3 /

lA/nor road 5 EVA 6VALLEY 7

------ Vehicle track 9 54-69 II ,0

-------- foof track IZ ,3 14

L6 I iantlmj ground

1.'35' IS ,6 13'-40'

MARANBOY 5468

4 14°00'

8 1.'111 0 .,'

133'0<5 '

WATER 55

14°3.5' 133-00'

!-lOUSE

69

IN DEX TO COMPILATION SHEETS

Record 1986/24 Figure 3 (b). Reference to accompany I: 25 000 compilation sheets for Yeuralba region, NT 16/D53-9/36

I CX! I

-9-

3. Rocks mapped previously as 'Edith River Volcanics' between

the Kombolgie Formation and Grace Creek Granite are crumbly

purple weathering products of the Plum Tree Creek Volcanics

and Grace Creek Granite, and do not represent a distinct

extrusive or in places intrusive felsic unit as suggested by

Walpole and others (1968, p.148).

4. The Kombo1gie Formation rests unconformably on the Grace

Creek Granite indicating an age for this intrusion roughly

equiva~ent to the }1800 m.y. granites of the Pine Creek

Geosyncline (Needham and others, 1980).

5. The folded greywacke-siltstone assemblage is part of the

Tollis Formation, which unconformably rests on Burrell Creek

Formation of the Pine Creek Geosyncline sequence west of the

region (Needham and others, 1986).

6. The northern part of the Yeuralba Granite as defined by

Walpole and others is distinct from the main body and is

renamed the Eva Valley Granite. Additional exposures of the

Yeuralba Grani te up to 14 km south of the main body indicate

the thinly-roofed and flat-topped character of the pluton

and link it with massive greisen bodies further south in

the Maranboy area (mapped previously as undifferentiated

granite). Other bodies of 'undifferentiated granite' in the

Maranboy area are distinctive grey-green feldspar porphyry

and are redesignated Maranboy Porphyry.

I (

-10-

7. A swarm of long, subvertical east-northeasterly dolerite and

minor felsi te dykes cross the region and cut all the

Proterozoic units. They commonly fill faults.

8. Sandstone, arkose and chert of the Jindare Formation are the

earliest Cambrian sediments, and appears to intertongue in

places with the Antrim Plateau Volcanics.

The Tollis Formation of the El Sherana Group is moderately

folded about NNW-axes; individual greywacke beds are prominent

and may be traced in places for hundreds of metres. Internal

variations related to higher proportions of argillite and tuff

which have enabled subdivision of the formation in some areas

(Needham and others, 1986), are not present here. In the north

of the region an area of interbedded greywacke, tuff, rhyolite

and porphyry (Bbi; compilation sheet 2, fig. 5) forms a folded

belt about 2xl km within microgranite, or may represent an

unusual, sediment-bearing portion of the Plum Tree Creek

Volcanics, with which it is in faulted contact. In the centre of

the region the Tollis Formation is intruded by Maud Dolerite

(compilation sheets 6, 7, 10, 11; figs 9, 10, 13, 14), a dyke

like body about 1 km wide and 10 km long with small subparallel

bodies to the east. The dolerite is extensively faulted and in

several places its otherwise clearly intrusive contacts are

faulted, quartz-veined, and sheared. The main body contains

discontinuous bodies of banded iron formation and Tollis

Formation metasediments. One easterly small body appears to be

conformably overlain by poorly exposed Plum Tree Creek Volcanics.

-11-

The Tollis Formation is also intruded by several scattered bodies

of Maranboy Porphyry (compiliation sheets 12, 15; figs 15 and

18), mainly within 5 km of Maranboy. They form disconnected

dykes or plug-like structures. The largest is about 3x1 km and

is very poorly exposed. Contacts with the Tollis Formation are

not exposed and no contact effects are evident.

Two leucocratic granite plutons invade the Tollis Formation

in the centre of the region. The Yeuralba Granite (compilation

sheets 6, 10, 13; figures 9, 13 and 16) measures about 24x10 km,

but much of the southern half is roofed by country rock and the

central part is concealed by Cretaceous sediments. The granite

forms low-lying sandy plains surrounded by ridges of hornfelsed

Tollis Formation. The contact is discordant and commonly

faulted. The margins are extensively greisenised and a large

greisen body about 4x2 km in size extends from the southern-most

exposure of the granite towards the northern end of the Maranboy

tinfield. The Eva Valley Granite (compilation sheet 6, figure 9)

contains three iregularly distributed phases of leucogranite. In

the south it is faulted against the Tollis Formation and Maud

Dolerite, and the metasediments are hornfelsed. In the north

the contact between the pl uton and the Grace Creek Grani te is not

exposed, and no contact effects are apparent.

The Hindrance Creek Sandstone of the Edith River Group

(compiliation sheets 6,

than mapped previously.

7; figures 9 and 20) is less extensive

It is about 400 m thick and apparently

lies unconformably on Tollis Formation. It is truncated and

hornfelsed by the Grace Creek Granite, and overlain by Plum Tree

-12-

Creek Volcanics. Evidence of the intrusive nature of the Grace

Creek Granite which is extensive throughout the northern half of

the region is restricted to the hornfelsed character of adjacent

Hindrance Creek Sandstone on compilation Sheet 7 (figure 10), as

contact effects with other adjacent units are not exposed.

Zoning in the Grace Creek Granite is roughly concentric from

equigranu1ar medium-grained light grey to pink biotite granite in

the centre (around the common junction of compilation sheets 2,

3, 6, 7; figures 5, 6, 9 and 10) around the Grace Creek tin

prospect, to increasingly finer-grained and more porphyritic

types outwards. The gradation to finer phases is accompanied by

a broad colour change from grey-green to pink and red, so that

the outer microcrystalline type is in many ways identical in hand

specimen (red to red-brown, aphanitic, massive, porphyritic) to

the surrounding ignimbrite with a microcrystalline to crypto

crystalline groundmass of the Plu~ Tree Creek Volcanics of the

Edith River Group. Owing to this lithological similarity, the

contact cannot be precisely located in the field, but the common

presence of corroded feldspar xenocrysts in the granite enables

establishment of an approximate boundary in many places.

The Plum Tree Creek Volcanics presumably overlie and are

intruded by the Grace Creek Granite, but the nature of the

contact cannot be determined in the field. Rare sandy sediments

occur in the volcanics in the west below the Kombo1gie Formation

escarpment. Similar interbeds of less resistant sediments may

underlie parts of the extensive sandy plains between the isolated

tors and rocky ridges of ignimbrite.

-13-

Unnamed interbedded greywacke, tuff, rhyolite and porphyry

exposed in the actively eroding banks of Ironbark Creek

(Compilation Sheet 2, figure 5) may represent a similar, partly

sedimentary interval in the Plum Tree Creek Volcanics. In the

east (compilation sheet 8, figure 11) an extensive body of

rhyolite, the Fanny Rhyolite ~~~ber, either overlies or passes

laterally into the Plum Tree Creek Volcanics.

The Plum Tree Creek Volcanics and Grace Creek Granite are

overlain by a weathering profile of crumbly purple material which

is overlain by the Kombolgie Formation and thus represents a

period of weathering at least as old as the early Middle

Proterozoic. This profile was mapped by Walpole and others

(1968) as feeder dykes or flows of 'Edith River Volcanics' which

they believed were intruded by the Grace Creek Granite.

The Kombolgie Formation rests non-conformably on the

weathered profile, and with marked angular unconformity on the

Tollis Formation. About 500-600 m of jointed and dissected

sandstone section is preserved; in the west it is unconformably

overlain by andesite and basalt of the McAddens Creek Volcanic

~~~ber, and in places a discontinuous siltstone layer about

30 m thick is developed in the sandstone about 100 m strati

graphically below the volcanics.

The Proterozoic rocks of the region are extensively faulted

by mainly ENE and N to NNE, and lesser NW and E faul ts which,

except for wrench movement on at least one of the east-trending

faults, represent subvertical normal displacements. Many of the

-14-

ENE-faults are filled with dolerite, which is therefore post

Kombolgie Formation. Numerous straight to sinuous and

occasionally bifurcating dolerite dykes up to 20 m across which

trend in the same direction are most probably comagmatic with the

dolerite in the faults.

The Antrim Plateau Volcanics is probably of early Cambrian

age. It is a valley-fill basalt flow up to 40 m thick resting

unconformably on older rocks, and in places contains sandstone

interbeds near the base which are laterally equivalent to the

Jindare Sandstone, about 50 m thick, which commonly overlaps the

basalt to rest on Proterozoic rocks.

The tableland of Cretaceous sandstone is made up of about

15-20 m of white kaolinitic to red-brown ferruginous sandstone

and white to pale purple siltstone and claystone, and in places a

1-2 m basal conglomerate is present. The sequence thickens to

about 35 m in the northern part of the King River headwaters

(compilation Sheet 10, figure 13), where it fills a palaeo

depression over Yeuralba Granite. Generally no subdivision is

possible owing to the thickness ('5 m) of lithologically

distinctive intervals and steep and rubbly exposures, but locally

in the west, where the sequence is levelled off by erosion, two

subunits have been distinguished (compilation sheet 5, figure 8).

Tin and tungsten occur in association with the Yeuralba

Granite. Tungsten has been mined from greisen within or at the

margin of the grani te; tin occurs in the same si tuation and also

in quartz-tourmaline veins within the granite and in Tollis

-15-

Formation country rock up to 12 km from exposed granite, mainly south

of the pluton. Low-grade tin occurs in quartz-tourmaline veins

cutting the centre of the Grace Creek Granite. The veins are

probably related to the central equigranular medium-grained

biotite granite phase (Eega, compilation sheets 2, 3 6, 7; figures

5, 6 9, and 10). Minor copper accompanied tungsten in places

within the greisen bodies at the margin of the Yeura1ba Granite,

and copper staining was noted at one locality in the Fanny

Rhyolite Member (compilation sheet 8, figure 11).

-16-

REFERENCES

NEEDHAM, R.S., CRICK, LH., & STUART-SMITH, P.G., 1980 - Regional

geology of the Pine Creek Geosyncline in URANIUM IN THE PINE

CREEK GEOSYNCLINE (editors John Ferguson and Ann B. Goleby),

PROCEEDING SERIES, INTERNATIONAL ATOMIC ENERGY AGENCY,

VIENNA, 1-22.

NEEDHAM, R.S., STUART-SMITH., P.G., & BAGAS, L., 1986 - Edith

River Region, Northern Territory; data record of 1:100 000 -

scale mapping. BUREAU OF MINERAL RESOURCES AUSTRALIA RECORD

1986/7.

NEEDHAM, R.S., & STUART-SMITH, P.G., 1985 - Revised stratigraphic

nomenclature and correlation of Early Proterozoic rocks of

the Darwin-Katherine region, Northern Territory. BMR

JOURNAL OF AUSTRALIAN GEOLOGY & GEOPHYSICS, 9, 233-238.

WALPOLE, B.P., CROWN, P.W., DUNN, P.R., & RANDAL, M.A., 1968 -

Geology of the Katherin-Darwin Region, Northern Territory.

BUREAU OF MINERAL RESOURCES AUSTRALIA BULLETIN 82.

,

lit·" W '30 31 32 33 34 35 36 37 38 39 '40 41 42 43 44 45 46 47 48 49

·1.·.. "41\Y,'( ~~\ ) ..... , r

-.~ --t .. -.-.-~ ... ---- -: -." --.... ~~~-~-- -. ~V i~·?~\= ~~\ -... . ··~f / .4501t----·-··----.----.... -~----

49

48

47

46

45

44·'

43

42

4It

~

/ ./

(

\ \

'~51

"

"

1 l , .. 40J----: --t---T----·----·--t---

1 I

39 "r - , , I

I j' ,

) .l... \~ l. ;-. l35 . \-..-1 -'1' \ ) r ____ ___

'/" , \ . \ I. I ~ ,) j

')401 I

I

-( ?'),,' 1-\ \.1 / 'A--.:1--/ \ "\..1 I '}. y..:.:f / I . r-- /' / \ ,\ J-) t-'

'. ,- "'-.-", rY'--fV \ ( ;Y i I j .I (

I . \

\

, \ ~

i -t

/ Tf-JJ I ~ '-fT-~ ~ , . ,/1'1' ~ -1-J . -~ , \

~mU. (- ~ \ - \ \ I ...-- 1 fJ< '\) I' // /7 ~t ('-\/. '> .j ;,{. )/II,{\ \~ \. ) ...... 1...

"~t I ('1 l

r-I'-":~

, A_I ~~ / /'(-,/," --. ~1{IT~??{ ,\ , /

. -..Y/" l \~ ~') 1--\ , '''1 I '- '-/ ~

:. .~ Y kI ,) / '7~7-i /r ~ ," , --! I~ ~,(' • -' U : ~ J !l).-L'L. \' / ';' .. -) i '-L;_",) \ '-~ ~~:lj-L}7-/'( ~, , l' ~ \ r ~ .., f -...--

+- ,i' ,I ~--+- -:/---.. ;"\~---tt ~; 7'-!-~ ---~~~-. , 1 '\ '-\ \,~ '( ,,)., ;.: .. \ ~ J ,--1: I ' , ~ ". \ I \:

I" I \ ~~-+-~ ........ " "-

·i

. -j I \ 1 0\ i>r/ ,.1 '-/),

. ! : '~y \.-:J-;(. ~,' \' I . ~12C 3~~--/~, --~----------------------~~~~~~~--~~ .. ~---6~-.,-

__ .I. ' .. J.... 1 .. 38·

.. ~ ... /

X 82120145 Thin section locality with B M R registered numblJr EVA VALLEY, NT

o 2 4 6 km

Record 1986/24

Figure 4 (a). Yeuralba region thin section lo~alities 16/053-9/37

I-'

'-l I

IJl M

'~,_!L ___ P -,\]!-tl (_ 36 ~jf'~ 38 ! 39 '~'40'-.... ---41 --........ 4;\ 43 '\ t44 "\ 45 46 4~'t"}P..,fj 4 '4 00 I' .,.... I \ --/ '5---

~f ( \ ('-) (zl

/,-\ '1 / \'Oa/ u,t i 1) ~'i ..J,l,('/~ I~' " ~}u.cep. r .. ~o I' (\\ \ \-j-~, \ ..') \ " -t!~ \{I \);' ~~~k:~" ... ',7\ ':-- . '--, -hV' \ \. / ~ Cz.st' '-I / ) / / I- 0 ll', J~l'.f?lf)~' / ~ ,; ~ ,-- _ / I (, / (" J\.,' i'} \j .. ' Phk~ ~ 5 ~ (',].. / \ (/ '" \

~ 49 rfl "--'...1--01 ~ \ ' \ i \\ \ 'I '\en ! I 'I ~ \ \, 'I~ )1\ +C£ \ ''-,- K

(\ '. fhl!, \ ".', - .... " _ ". _' I ' , ~~:-:~\ ,-I _ \) \'''''-/ '\ ~(/M<',j ~t:"f \. ,j '::.,.t-R ~)., I Cz,fep '- ,,~ T;:><- !

\

.... j / ) iI.. \ \ '__" '\..... (' \ 41> t,, __ , T" ,(J I eli!., , '\p' "" \ " '1-t,) ~ \\ 3i

'\ ~-/-l ........ I -', r-} \ ~ 4'> " : I- ,- i \ \ \ I , '~

\ \ f\. \ \ \ \ \-__ l.:. ,~ fhk,.(, I ./ ) I) /.) 'J " \ fr. "A l-

1 /\( (01' 'Phk" 44 '-)// I L---0' :

r) 'J I \ ( \ ------~ / /--",..,.-" t \,_

/ / \ I \ I )

t1B Record 1986/24

Fiour. 4(b).

- ..... _",--,- ... ~. R 1I4;JI1 ........ lIIHtltM..., .... T.,.".., --_ ..... -",_ ... ,_ ..... ." .. ..ec,fI ................................ -.J _ .. _-- YEURALBA REGION - 0_ .. _

_,1"00000 COMPILATION SHEET --_ .... __ .-::-:;.: :.:.~-:..":.~ ":. ' .. =':.-'110 .. .,1. __ jIlT_.

Yeurolbo Region 1:100 000 reauction of 125000 compilation sheet. 16/053-9/38

i S .. ~ S

I-'

00 I

51 52 53 54 55 56 57 58 59 '60 61 62

i' , _-..... l /_.,.

r>----I-{, r' - ~ lc.. ( ,\--"., ,~Jj ,I / ,L '.:.. '\ '.>:-) ____ ./ -r-~ I ",," \ ~ j\ 'I .Z27 ../b -, '-\ .. t {Jt V- - f. " ,. )1 - ~~ / '\ (1 I !I L.."-- - . j....L..<"; \ ~ I I J---' ,-l:'1 .. " _(~) A. Ill' MOONT IAMIiIl 'il.~ \ / \. --- if. \1 \ J \~'---- \ ~ '( ~ \' I

63

, -.I--{ (,... t:-~ ___ ~ \. (l..--\ /" -: I ,/ \ /\"- '-t ,I ~'\ ' I '1____ / r" "- >--- A--- \ ~-'- ' / l :.:r \ / ~ I ~ \' _~l \ -i",:~ \ / '\ ~ t'/ \

M

\

\

67 68

~-

\ f'--,\: -~ \

( 1,\-.....,

I \~

( \

_, ,t J I ,..._ '\./ __ ~~"-\ ,~ l-----~ 1/ \- Y \ \ /-

I I ( '<. \ / " I :'.:: / \ / \/ \ / I L-- '-.. A"/ '\ y / f-~ '-I '-' I \1---:_' \ I / I ,:>.-" I \ I / \- ly / '':,J \ ~r~ ~l (' / \ LL_" \ I ~ , / . -- J-,</

I \ (y \..)-J (J-. _--'> ...... r I/" \ \ / (_j] \ I \,,( y--.. '- r.- '1' ~./' '" ... j '"

1,\ ,,/":' J., \ ,\ I _ }\-- I r' II nl 2,91' I. ...,.j,~ ".' } ___ "..... \..,) \! / \rC \' (\ /-....._< \

"'" '" \ j, r< ·214 I) "-~-- ~--......-- "-

,~ '1. \ : Y r\",I.<'" ~\ \ (} \ .. //$~V _ .. \ '" '\ / 'I~/" '"_, / \,'- ?--11..\" \ , , V / '-<, / / \ (-""'! \ / \ . \ \ l' ) J. . \ I l) \ 821~014Z "'y-2r- ;1:"'-''< {"..Y \ (

r-.--) i-t' r,f\" I ,,,- (82120129 I .,... >-~;'-- ,- i r-l. J ~ / , I Xl82120139 : (~l6d~~ I r"",~./ ~

_ -;!.. U r 3t .... ~VJf"~ (82120131j --- $' I I \\ I ~--<" \ /1 '\) "'\ ( I '-J' '\ /lI. I J \ '" )-, "\, f I I ')j -, /' ,-x"!"20'34_< ~1 I \ J," ',/ .... _ ({ _ " ';r \. r /......... \ { ~ \ '-,.'-" 0~ / I' ''-.. I I \ '\ - J

I \ ~ '-" " / ~" " ~ , ---- / ) _"_ ._.__ __ •• ~~,,~ ~~ _/{~ _ c --f, \- I ' / . "- '\" I "- ~1 V./..-' " )\_." , '.. .. ~. \ . . \ ,. t' '\. I \/, ',.\.-t1 L , I , Y ~ \ / -- "-"',/" \ ~ " " \:..", ., \ I J... ~ / t" \..

/ --.. { " I 'I \ \ / \ ~ . /._., 'Z \ \..) " ,\ "- \ / r--:.. J' \/ ))

" ~ -,_ , __ / I .216\1 ; \ '" V ) '\ ( / " ~.' -... / ._ \ ", \ ;-... /' ___ ",-- __ '\ --... \ '_, ~ S : \ \ I ' ..--i ' ' 7' ..... ~,..- , ·21. \ / \, I ) /- / \ ,...J2014~( { '7 / ~\ ./ ~'\ . ~I I J--/~-L.- "-.,. X8212015~

X 82120145

Record 1986124

I ' ' ~\' \ t ' ---- '\ \ \, .-1-' .", K \ T-\ / . ....", \ f

(

Thin section locality witll 8 M R rtlgistered number

- I-I

EVA VALLEY, NT

Figure ·5( a). Yeuralba region thin section' localities

:-.. \

\

L ~~.

o 2 4 6 km

16/053-9/39

.... --0 I

::; .x L

<

41 '10 ) \'b)...... I~l \ '''b. ,~ ~, \~- f;- )-_,~,.J-

iJd-~'.! / . ,-'f r "'. ep r- ~~, 1_.... "..... r-( ... , \. '\.. ..

\ I

rlp.lz

\J'l:

EVA VALLEY NT

_-.100000 COMPILATION SHEET 2 trn - YEURALBA REGION -Record 1986/24

'\ J --... ...... \

b.I_~ ~ ~~ _ ~-"--I -=--'' '/. '\:t1 ~~h)fc;i (~e9[ -'rr. \ (

I '- ~ v fe;j -,-" .-t'tj, a ,,~~.

1 t ,-- '- '" deg, \~

',adA> r\~~, rt'tj/'''-il c-.:: 1e'k' (

"- '-._---

~ .,. In. ...... 01 """"111 AMuuIl:.', CHil)/OQr fII'Id ~_" '" C9ft~I" Mlh t_ ""'I_m reHlfOf,

~01 b\4J. ()eporftN .... aA ,.... 0f10d [ .... '9' 01 PQf1

01 I'hII ~c;, of Go~ 10 0" .. ' • ., 1M •• plo'OhQfl on4

~nl 01 1'IIIntt91 r • .ourc" o C~weuHh 0' Au,,, • ............ ""*"' ............ ~CJf ... "'GPmct1...-.... ....... - ... ,.. ..... "- ..... , .... IIQt ... ............... , ................. ,.. ...... .. "_._.P'O" .... _ao"ACT MOl

FiQur. 5(b). Yeurolbo ReQion 1:100 000 reduction of 1:!5 000 oompilation ,hut. 16/053-9/40

~ :;:

I N o I

II' 67 68 69 '70 71 72' 73 74 75 76 77 78 79 '80 81 82 83

,-\ '--~ __ / I, f ,ri\ I '\ /:.--- ( ,r" -- , /--~. I --- ''->--, (\

r jJ- , \ " f'<... r '/ '/;, _ · '- 'y \

--~~-~l:<~-;: '( ! ~\ ~\ 'J ~~~~~lS-<~,_ /, , ' ,309 "( \ \ 1 > ~ __ "~ ~ ~/ \ \' vf~ { '> r '!'r v 'I \ v"J '-t----< \..~ ~--M >-",::--71 l' (\-- ~ l,-~ \ ("L ("-,../ L- X82120150 'V ~r----<...~ i '---.. ---~~ ./ '---< .....----; ~) ./

\ " \ \ I i-I ~ );.. ('.. --Y \ J-.. I ~ - { -~, t \\ ' '~~ r)'f\f~ X I 't-./ \;~~ i /T '-L\ ~~ .../ ~~/' ~_j \~ '" ' I\!- I ~/(-- '--/< ! ~--/~ '--- ~ //.J

{ I \ /~ V ' \t V~ 1-\ L -~, I ,'-,.L-'/ ~/' ( \ 1 / ~~/- \ ~) L--- \: y/"'--,_ \ ) c.,. ~/

J.. / ( l \ \ '\ J.._ "ir--- -.\). t/-~~--\ "~/ /' I "<" 'j": J..--_'m) ~~ /.J~J" \---~ : \ / \ \ 1( \ r-',---,/ l~

/ "-.., ( J.....--/ y....J., f<'-.---'\\ y\--- ;.. ;;~'vl \ \ '-'~r OAt ,2" J---{ , /"", / ' ,/, T '-i.J.. \ ~~" )..-</'; \

'" / i "'----',-<;J/ '---<.-r------- --;.(, \ ') ( O,-< V \ -;>-(>-(1\ '- /" \ \ \ \,..-< I \..... '-- ...... '\.. ,;..- t 1. \ (\; I " ' ",'......' I'--...,' ~ .. / ./ ~ '\.,..,)-..,' \" ,->---\ I \ } __ ; -<:C. ',L.. 1- 'ZII ,~-'- \

" ~' r" '-", 2\ \. I ). / r I - .. r 1,.-".

-~

I 1 '\ : """ 1I.T\8'120~~" u~\-- :" '- I£-, lj , ) /( 1_/--:'"',----, I ">, ~U~ I h \,~~J~t\$( -\,,\ )...-~V,,_~~,L.( \,.~. / /~"I~ 'L-'

.l......d I\. , ~ "L--,v . \, I', f" '151 ' ! I \ ( p) \ ~'!-.\ ,..~ ... i \/ \. Y .l 1"': ') \ ,'---'-\' .,....J'( J \ ) \--

\ ; ./ -1-45 -:'1\-) ",,-\; I . .L.-: '- \ _: '. i " \ \ , -+- I / ~ '" I "'-1"/ I\. " : Y \) ~ ->'-./' !" I A- ,"--r~ '( '/\ ---\' !

, ,). "'-" J , "-./, i \\. t "';- J.. ' '" l yr, , \ "J" I' :.: I '\/ t \)' - "y r I I 'I', "t-~.0 -L\.- ~ (r X.. (/', '/ / ' \ '-, y \ / \.. t ,)- -\.....--- 1<-- '" '\ I / --. <. I ~) (/-: \j ! ) I "- r--:. '\ ' . '-->; \ ___ _ \ \ )'1 " ,---' ( y, ")-'-..f. ( . L. ~) 1 \ -, - --~-- I, '-~'---Z'-l~- "-- t.c..--""--,,jj" 1. -\) \ ',- / I, ')

\ ( I ) ~I ""'/', ~ -.., '\ f-..).. ..... /" \ : ~" '\ V- /..- \ r \ /-...\,/) i " -' ~-r" ~ J ' ... ,) I -z ) \ )

/-...... / ,821201551--..f \' -J-.... ,"- 'L..rl ---\,r'\ !. ---1\ \,-,./'-I)J "' ........ .-L~'1)--\X "T....... '. ) -1 ( -, ~ ').L.. '\ )

\ 1 1 )(~2l2bI61 / Y"-.-\\'f'- \) \ 'l. i\ L \.~J... '\)"''-. ,,~~ \ j \ ~;--... / ~(( V"- /'--..c- 'l.->' I, .\

<: ( "r' '-. ''-<: '/) \ ; ~, ',/ '-'-'" '" y , -/

X 82120145 Thin section locality with 8 M R registered number EVA VALLEY, NT

o 2 4 6 km

Record 1986/24

Figure 6(a). Yeuralba region thin section localities 16/053-9/41

1 N ... 1

~ ~ ;: ~

~ S

~

E VA VALLEY NT

~ --_-I'IOOOQO

BeLort! 1986/24

. I ./ .

YEURALBA REGION

COMPILATION SHEET 3

, -\

f'9d-\' \ -..,-1 , \

, 11) •

~14.

e'9d 14" /'11

~ :: 0-

I

~

~ " %

;:

4i~etp

o.n.w ., t ...... fit ..... ~ 0. .. , .. .......... '" c ......................... *'-'" Te"1",,, ____ 4 __ '_--

......... r .. ~ ...... ItI ........... otIOfl ....

~of ..... ,..,...

O~ .. Ai..tf· .................. ~., .... ...., ......... ..... ... ... .. • ... ...... .... • teff,lNt ... .. ., .... ,..... ........................... ., .. __ ._."Ila. __ AC1_,

.1

::.'

I

S

~.

'III

31

Figure 6(b)' Yeuralba Region 1:100 000 reduc.tion of 1:25000 compilation sheet. 16/053-9/42

I N N I

81 82 '-( { 83 III .. iI _ '-- <_ _ \T'~ - ~~. 87 ',/ \ '-- 'V \ \ \.. - '- 1'\'1 '\ ____ ~T8~- 89 '90 \ \ ~", c _ .",",,; ,-,.7C' 91 9 I ~ /-' . ./ \ ",r.~, .. "",,,,,,_._2., 93 94 ~ ~ \ ('.-' / c /_ ,/1~ ! \ I 1 ' )'1'--'--- --,. . -I-~S -96 97,"-01';,0" ~ r-.{r' c' - () \~ \ ) ./ - :if--' ~,~-~_ _"-'- / _.~. ---:71 /' \ -1 ,-- 1 I~~V( 1- h~~-<~-T-114·00·

--"- _ {/ ~ ".-~ !' . . / .>'"""'\ . fr· / /' ~ .-- ... .J .' \ Y .-L/ ~ \ l ..--' (\ 51 , "r- \ ,.,,, \ ( / ". / ' I ., - If '. / \ ','-' ' ~~, I "\ I \ _?'. ~J' - j rl -+ .,. '.

/ \ ' -. , • .-\ (/ ,/ 0 ',' u,· ,."

50-

\ .l::- _~, I (, _/..J "-- FO"'Jl-~ I \ ,..-'/ /-Y ,-. 0:,.L-.'- ~7/~' "", I . .l--Y" .'-

49

48 ; ____ -\'-'1\",'/""i \\ ,0. // I ." . .J."'\-" \ ./ /" \,1 r" ---/ / \ I ,./ ( .-y,/_~~ \-' \ ,.J ( \ . f' l '\ / ~ r I '. '- / \ y,,:" I ,_/ \ (',j v' . .-VI.-""i ) - ~ ~/ 1 e

l . ~n\"~ /<_ \\ -\ $ \ ; (,"<c, f) \ (. ,)1

L " \ . ." I \ 1 , "1/ \.(i ./ I 1/ \ \ C. i \ I / V' 141

""f' c- .". / " IZ// I) ( \ , -'1 \ 1// \ \ , '- I { .- j' .- \ I ' Y i ( \ \\ ; \ \" \ ),,/ I" :t:< . 1 1",.1\ ,', (0J/ I "'.s. ) 'v .- .<./ "0/-"::- ,14 •

.- .; ) '.. Vi' __ 1/ ~ '/~ I \ (" p-<' -r I ,/- ).J""~Jrj' ) I 4 r:- \ -, ''\ 14' .... A ,) \ __ \ \ /,---'\ " /.l.._ }----</ I ( \ \ \' I' ., ~\ \ \' '

. _( /"_ I 1-" '\ \ \ 1'\ - 144 '" I r, \ ---\ 1/ --;. (~---./ - /-' ) /'----) Y Y '\ r .,/ I .I / ~ )!'< 'c (r 0 / I 0 ;- ~ .c.. ,"--- \' ( ~~

\ '- \' ,_ / \ \. I i <Z . l I \ '-- "Ii--- VI f )- '-... I)_ \ ---.. - -) P

43

42

41 , Y '\ .. ) . h - '" -\_, ~\/ \ ( I. I I \ /'_r" ,~-/~,j- \ /', ' V- r..:--) j 0 ) .-~V\" . ~~ -'./: \ . \

--1 \ \ I I, \ ( r"'-' .', I ) .---1 \ 'V'!') -<. j \ ,.-../) .,.7 , . '\'j- ·r/ 1. -, \ ,) \ r.} 'c_-,-_)'/ h do'''- ,c;~/";7 L .. .- "_:-".1 + }.~ "\I'~ ,.) ,~j _,r/c.,. $ ~...:.)::,.-140 ), \ ) \ _I ,( -" !' /" . ,_ \ ~ v·,---' I / ,,( , __ / f'~ L.-, / ( -

I I ') " '---<;'-----..,J-..---y

\ ~ 38

y'

X 82120145

R,~c()rd 1986/24

//) I _/

Thin section locolity with B M R registtlrtld numbtlr

, '--t·L-~.J 'I t __

WATERHOUSE, NT

Figure 7( a). Yeuralba region thin section localities

o 2 4 6 km

16/053-9/43

1 N W I

~ ;; .". .. II

! S

~ ;"i

~ i! :I

\ .

!l8 ie' ~( 4:0 f' o/i ~o 96' 97 \ t ~~'tf':-r:-~ ffll::J..P"~~, .... .Io., • .iJ- .,...- of

.. '::/. 31: ~,,-,(

\" .... ) J

1,\ ('\ \

'-..

'P5

/' -',

366-

.. " ".

WATERHOUSE' NT :::' ... ~.~=": ==. =-:;:: .. ~il]l±±j= Record 1 986/24

Figure 7( bL

YEURALBA REGION ,.... .. ~O"-..... " .......... I!,.,...,.. " ... ,.,fIf~ ........ """,,,,,,,,,,,,, ................... ,....... C~af ... f ...

COMPILATION SHEET 4 ..... ~........,..... ........ -r,..,.... .................... w(f.IIwt ........ . ,.. ..................................... '" .... _ .... .to .. u .. ~"J ..

Yeurolbo Region 11100 000 reduction of 1'25000 compilation sheet. 16/053-9/44

I N .j::. I

JB~:-----~~~*""~~ I ~ ( ,,\\,), \

[ i t1!}' , > If l L "';9"'" / _ ~f:~ ~ ,~¥~:\-, F A'J\\ j ~\\\ Vol, 1(2~!49\J

/,,'v . \ -, [\ -~'f'~-).Jr-~'~:'::);II " j", /;j4,JI ~("-(\

'-"

//

3610//

~ 't-------351'\ \ \-'\

~--- '

34

33

Ir-·-

32

31 ')07

"30

29

28

27

26

,," 1:: I~ ~ -I ~\-_ f·K J J --I /' J" ~ ~oo ,:;, l \ 1 -J. 1)--'

• I' ,J-) . -,I :;:A" I / ~~ '// V\..~ ~~ (II \ \ '--t-" \ . '-. __ ~ ,0--" '''~. \.. (' 'i-- / - ,.-( '\', . ~" •• ~'1l))~ / /~(i; c'3l 2..;::-J/:'~ -1.1-"'1 \

___ ~ ~,~~",_"J, 1\ if' ~\.-J \>/y:--::~' I J /,_ ~ r" (r/.YI ,~).J '--L ,)- I \):: \

( (f::-/,.- J,"1J/+-{\ I • f- ;~y ['(-ie, \ ( \ /7,::- 1/ \' -< ~ \ '" \ I / (T) I;: ,\' \) / --V

- --j "\', ':;-' ), ,I) ~y Ie.. . ",-'I \ » \ ~I-'¥' 1 \ /j J ,J' J/" ( " I \ I_f' ~~ j/ '-,! ty l ' /-- 1>1--' Vi" )-. , )/ j \ ,)',. ~ ]A"' (".~ ,,": \ J \ I' ./ '

. ,0 \,.1 v >.-{ 1.---.,.-1 -\ -.1: ) ----el ___ "''\/A fA \ ,I t> \.'~;. '--I/ ~~ \ /~) \ ('II '/.) '\' .. ,//~ \ \ '\ / V \ ~ {--.... ~- J J~\ \ '\ (

'" y 7 ",,":J... '

\ \//,,;_'\,,\ v"---- ~"\/ .f /' '/-\....' ~j , _y \ '- , "J\ 1\ ~./ ! I" -. .., I / \,\ \.. \ < \ j'\.' / f ~I -.. \I~ ~ ~\./I,,-,r-I1/- \ i " --(

, ,,_ f <"~ \\ ,'V \~~ y1,jY .~ ',-,' 1>-.. "-,, - 1'--, " 7 " \ "-d'c.J/-\ ,)oj I . /' ~, I

'--\1. \\ \ ') \ "' __ :'( \,).; ). / .A 1\ , , \ v" -' ~ J~ ( -( \ ,," ' /'-" _,,, '-. '-< J"\ , \ . I ,

\ \ "

25

,325

241- /:

;/"

\

X 82120145 Thin section locality with 8 M R registerfld number

Record 1986/24

EVA VALLEY. NT

Figure 8(a). Yeuralba region thin section localiti'es

/ l' 82

o 2 4 6 km ,!

16/053-9/45

I N U1

(

~ .. ~ S

~ x

S

:l ~

~

'" ;;; x

S

~

• j I(;nY.!" (~;-·-'5 I \'\ L_ , u )

j~./.! \, )~ K.u$ \t..-~ , I --,j , ,~

~ ~ -~ " -. " ......

III

1/

.,

WMl K

EVA VALLEY

9=.,","

I --'

Cb: kWl czs,ezl K K

YEURAlBA REGION

COMPILATION SHEET 5

1i.vt;'>1/~' i".J{c'1l-""":')\':~~~\'~iW.'" l"Ij\Up,l..l\-(.. yr>:,-n~ '- \(/ Cz~,~\v'" 1S:~~1.f) , ~''. rl~"r;''''~ .-:

.. _- l---k'+ _1n. [.... .. .,L.c~\ ,_ 0;\, . hp . ,..- - vt"'\ \\j . \,' ;:-

- ..... - .. _-_ ... ........... --- ... ""- ......... - ...... - .. -... _ .... "' .. ,..., ............................. ... ........ fI~ ...... ..

o~ .. ----.. --~. t .. __ ........... _-.. _

;r::...-==-:.."C'":"'" a.:u. Record 1986/24

Figure B (b). V.uralba Region 1:100 000 reduction of 1:25000 compilation she.t. 16/053-9/46

z '" 1 S

" .. 1

i

I N 0-I

r : ...

, .

,

In

~

o N ...

~

-27

-

( )

I

f E

.... CD

V

o 10 v-o C

\I

C\I

IX)

X >

IJ.J ..J ..J <t >

<t >

IJ.J

,.. ~

..... (I)

I

'" ItI Q

..... co -

en Q

)

-o (J

o c o

- (J

Q)

en

c .s:

-c o C

It Q

) .... o

.Q

a .... :::J Q

)

>--o

Mlw

7/a

uA"

::9:D

O~

\:".

0

.. ~

-:; (t

)

CD 0

0 -E

!'.

t:r

N

-""

-< •

Z

C ...

~

C

tT

--j

--'!:v

( \

,-"--

'-/. _

__

-t::

r:-.

-J

C

~ • ~ 0 ;:

) .. (5

n -<

0

0 ",

!:

0 "0

C

0

r ::0

0

l>

:t>

... ~

r-•

0 m

C

L I:

Z

>

t'O

-O· (J

) ::0

::

t :I

: ",

IT1

Q

a IT

1 ~ -

N

0 C

J)

z (,

JI

0 0 0

Ii\.

lTlo

I4jl

! S

N

-82

-

. CIL )C

/--

-29

-

~ '"

-:,

'" ~

\ \

t

.... N

<D

'" .., '"

... '" .. .. ~ .---'-! J

/ ! .. -; --~ (

e ~ ID

~

o

~~

.~~

~

~~

..... c:: ~ ~"l)

I:) 'II

......... 'II C::

... I:) .!:!

..... C

I "

''11

~

.... II) 0.: .~ ~

~~

10 V

V

N

0 ..... <0

C\I

c:o en

N

... CD

'E 0 <.l

'" X

II:

en ., ..... en I If) ., a ..... ! o u o c o

- U

CD C

It

c .-s::

-c o OJ

CD ~

-o o CD ~

~

OJ

u..

z ~

I i!!

~

lilt,

~ , \ ,

I

~tdJ.z , D_ C 7

~~ /- lCg",Z\ 1\'. ill v b l~ ,. '- 1-/' q < ~ { _>., , .,J'"\, 1 -- ..... "., I ~ ___ \..

~~I <-, v ~-'~i",\ ,1,r \ '..., I.... .. ::---...1'" ) ~,;r~ tla ---

.'\. ',' _.. ~L tot /-r/l'--l.,·'"~ r . • fe9d, Pep

Record 1986/24

fivur. 10(b).

'''''''''-:'-:\ t-"':v ....

YEURALB.A REGION

~IO.'O. COMPILATION SHEET 7

'- , '~

I \ \, . .... 1 .....

.--------.----------------~

'." . .......,.. ... , .................. Net"*,, I., •• -....--_ ... - ....... -. ....... 0,"' .................................. ... -"-_. 0-'''-"'":-~~ ............ ~ .... ~=~~~ ... -~, ... ~ '·I!_ .. W= .,.,..:m,-" ,

Veurolba RIGion 11100 000 reduction of 1;25000 compilation sheet. 16/053-9/50

'"

I W o I

X 82120145

Record 1986.'24

/ ) I \ I ~" '" ,'/'-', , ( \./ '"

" ~ ./ \ ,

\ . \j I

'\ ( , L\~ ) '-) I I L \j //:/ ( '} _ ) ,l V 1'1 / A \ )

V I

- I ,,-) Y I ! \ rJ '/, J

'" -' ) U\::!. / ""-- ---.-...L - ,-.{l-- ___ -J.....Ar-- v " / ' - ",(

;. ~ -- (( '- ') I --'\ /

) '->"

'\ ') \ '---.- 1

\ .,---- C -r:-: / ) \ / f--",

( ')" " " ~ ,_L_

\

" _I) ",-,{'.

/

r \, .-~ I \1 / '\ \ \. I \ /

'{-". "-, , \

~\ ): ~024t_i ' '. fl\ /X _../ \ \; \ ). , I 'I

-'

'<

'" (.

\ \ \ I

",

·27<

( l

,~

<.. 1

\-,1-' '- / . J

( '\

-. - - /

I,' I )

' • .J I' t--'), '\~~ 8Z120132 \ )' \ '-, 'e

~ j I' / j .' . ) J' -4 ... " ....

\ ' ( , '\

/

,/ ) \ (/

}

./ J /----------------

112· ////

'\ I

31-85 86 87 88 89 9IC; 91 92 93 94

Thin section locality with 8 M R registered number WATERHOUSE, NT

::1~

\ ___ ~ _--.\ 141 \

~ ----1 _-..... 'l~ . 140 -f"

'" /' -- '\ 39

/ 38

37

136 '\

\ ). - /

/ /135 ( (

) I

/\ I 134 !

/ \ / / ( )

133

I \ \ \ 132 \ \

\ '\

\, ) 114°12' ::10 97 ,,°0"30

o 2 4 6 km

Figure II (a). Yeuralba region thin section localities 16/0!l3-9/51

I w f-"

I

"

iI i! ;:

"30

---

III

I' .....

~.

...

2Cl 1-- --_ .. - .- -.---.-----------~-.. - ------------~.--- ... ---.- ---_._-_._-----~----

WATERHOUSE NT

~r·T-l_ ri t,

,; .~

tt ! I , .• l.! --"'00000

Record 1986/24

YEURALBA REGION

COMPILATION SHEET 8

c....-. .. '''' ...... of.....,. ~. UeolotY .... GI~ ..... co ............. ,_ ,.., ...... r_ntGrJ ~. Sur~ Depar,,,..", at ........ f.,.,.. _ I\IIIfI fill 'N 10k. 01 Gow .. """", fa _. In IN ......... CIP .. ...."...,.t ........ ~ ..

o c-.-....n", of AM"" =-:.-:........::::-::::::. -:....-:::. ~ .., ............ ~ ....................... .. .. DrIc ........ _O ... nl.c...r .. ClllI.&c.' MOl

figure II (b). Yeurolba Region 1:100 000 reduction of '·25000 compilation sheet. 16/053-9/52

I w N I

f

_.l L-- 'r-

,I

23 r I, I' .... . lIe y ~ J I, V \\ ",,') \,'-,\ Y ) '-.."( ~\ ." ,---j .~/~~/"\~~T'" / \// /' \ \ l l Y ( \ 'vX/ -1...4/ :::_ \ \_._--\.----- --, . \ :1 \" / 8212( \.. r ____ / ,,~ __ - - .).L. ----F - t-t .I "I.~ -...-< \ /

221 ___ ~--.'-\7;-K---~-M \\ t ~ C,ionaI //. ~" ') / __ -$ \. } ""<. I I, { I /$; (/ l)/ I:' ;v{~ v// /~ . "----- Y 'il "))-1 ~ . ~J 1'1;',..<1

2i k' \\1 ,,\I A,----)') /«~y;:-< / '-? /'+ 1 "-"'- il\ '1,\ ft'-v '-<", "" ~f'~~~~ ~" '. y/ '> ,,-\y y~/ 'r-;-. ~. r·,. / /' V/ '--. l.., <:" \ ,,' \\ 111.' \ /,,,,~' / \...., 821,

-i y J /. ,\' I // ~ t 1 V--//" (.6 ( ) I v .k ~,\ . ~.-......,.(~ "'-"20 •. -.;;..~-.l'\"'T .J- /'-L'-~-'/'~V/ V 7 • '- \ ... v-,'....... \ /'---..,,,, '} \ \.y: /. '/? \ lY ;t / \ .. \ ...... ~.\..-- - .. ~. ~A'12nnA.l'--<· I

" ("y07V ) /:v-:'/p.., /" \ I \1 A / .. \ t . '/''''''''I~:'~'-'' 19t..) \ \ ./ 0:f l--... ... /f(.~"V\ ;/)/ ~ ~,( ~ t4U \ ~f=- "\ ~_ 'J\ r~ \ \ • '303

__ ~ --;\f/'J X"" ~ ''\ ,\ ~ \~," 1"- ! \ '\" ~ "1\ ,_/~'\ IIL!,;.«(1 ',v.;JY u/ \/ / "f) 0 '\, "" ,J\', ,I\~ ) /;,--

/ ,,--Y ~ '/ ( \ I n.lIIE ·X\ftI2001i'''-,./, ", ,:1 I' ,--.....: t; "'\ /j( / ,\ / > :1:t4E'" , \ \ I), \ 1-1---- ,\. "A... ,\ 0\:'//' I)" \ ~"I '\ I ~ I g-C.. j I. (~ ',30~\

..... ) --t \) (I r l1 ~ I I \ .... <'~ \ \ L, \ "\ I '

\ r- 'r" (~\ ) \ .( /' vr \ I y ~''':---... /----'R1THERt~~~\rtONAi~i \. ~ : \ //f' I tv "''\:.\;: /--'j/\ J -~).'-. \,\' fr--t \ ), « ) \ \ '\ \ I ~ ~ , (/ \. - ... ---... - J " f/~ '-: '> '- ~ /-\ ~ \ -' 'I /.L \ ....... .,..-::;;~ -----/

.. 141- J r't\ y/ : ... --~"\ \ ........... ,}-./- 11 V~/ I " r ( r: V? -& ~~ \ r- . //, V~ / \ ' . -~ 1;-'- --.-

I! (t '!\ < / \. . 'r-,--- /-G t-f ........ ..,..... \ vl ·2 13f ":""'1-.... '-'I ), ) I \ --<.. (~. '1::,--"\ ' I ::--r

!-(" ........ " , ...,.,: ,ZD .~~-:""~~~ __ 71~---:t;->-.-----------"'T----" \ J ( ,---;;:f--:-1 ---,~_._. ___ --..r-.---- --C \ (\ J \ it-- ,V 1/ \ \>(-~../' 12r'-:r=r-c.;~ )::/- ___ I... J ~ I \... 'I V () V I

( ;::: (y (y '\ - \ \: ' "V,*,I\ ~ ,/ ':y i 111 II ) y ) ~- \" . '" I -.---, '--~ '-, 'Y / I 1/-'

Y / J'; ~\" -. I ;L-L ~'----";:-/-- \ '-----V If I ~ / / ( '<J/ y'/o " llJ/ : -_+L: '-~ '\J /j , y ) \ ~¥_ ....k.. ' )I /---~ ~) \ I " J ) 0 \ Iy-/ ~. ~. ..:-....-'"-<... 1 -~ " . ----:-. .....-:::t \..-" '\. v I } / '

o I ' • /,/: _ /-J (... "",- \:... . \ )J* 7' 3 .._ ____ /' ( / r 'j / '-, / V

, / --' 1 1 ) j ..JJ /\, I .A > \

X 82120145 Thin ssction locolity with 8 M R registertld number EVA VALLEY. NT

o 2 4 6 km

'I Record 1986/24

Figure 12 (a). Yeuralba region thin section localities 16/0 :13-9/:13

I W w I

x

~ .. ~ ,

:;

f .. ~

(II

:'9 PHI EVA VALLEY NT 1-' " ~_-t ~-

n --t=j =100 000

)1

YEURALBA REGION

COMPILATION SHEET 9

l J> - /;

r ,---r / -+--. ~ CL5.~1 j. ~

" K

c..rr..-. 8)'.PM .... of"""" ".IOI.IICea.GeolOl)OI'd ,-", •• ,11'1 coUOborQtlOfl .t" , .. Her"'-" r." .. , '-oIooJII;aI _"." o.p. ...... "' ..... ond E ....... part

01 ... .,oIIe, of Go .... ~ to elM' 1ft ...... pa.raIIOf! arM

~01"""~

C~of""''''. "--,."...... .............. -... .., ......... .................. " ........ , ........ .., : ::.:.::..::t.-;;:c.:..o: ~ :c.

Record 1986/24

FiQurl 12 (b). Vluralba Revion 1:100 000 reduction of 1:25000 compilation sheet. 16/053-9/54

" .. '0; ~

'" S

'" ... i ~

5

i ! S

~~,f~ K

~

~ s

I W .j::o.. I

'>." . 1 \ I i I \ ' / I ' /' J \\" . \ .. "" I

-.( '\ /,82120133X I' " ---<: /' ! '" "-. )~) ) / ~r \ r- ,\ ~' ' \ "119013'> \ /t' , , 0< I T-,< ." ? ~~ A ,-" --<--.,/ ~ \ ~~2120135: \."'\ \ . 'L ~~ " / \ -7 \ X 1 ~ ~ . l"'",/ ;;;:~ ~ '-, .t.1~2 _ J"t Z,? :..I2~02'1 Xf'lzosit\t~ , A" / (C j • ~.' ' \~ (\' 1'- ' ,/ f"-, ,,>P , n

W' l:;-J. {'r--:--< --t- N ~~1> " .

( , /7'-:'<'/\ /'0 .... \ -I () ""-/ )

I , ~----\----/" '" "-f-_,

... "'/ ,........ .... ........ ,;",,,,,,, __ V- '---'- "", ... '" --- ) ... , 10 _ '/ w. " ',--,

'-, y' ,/-" _____ ~ -' " V~- -', ,/ ------ ,,>,' ' ' / " C-V - L '... '

_ ~;;_ , :::. ~" i } '-r ','----ri-::-'1''' l:-'\ -0~"'J.. ,_I t<-- I)' '" _'-'_ ~_. 1/ ' ' " ' " ' ,_/' r ) I "f-"'-'- ' \X:~--/I . ' \ / ,'V' ," : -I i ;. V ," , ( <\ I I '\ / \ \ I \ ) 1,/ \

\\ _ ' i /1 ",( v,, ' \,( ,,(~ (J\ '):Lr~'- \ ,/ . \ ~ y -----.. \\ 5 '- \ ----- }) \ L ,/r-' h" " , \ "/ }/ -y.!_ _~ \ '" -~J /' e:--- I \: -- ,

'-+- " ,_ _, \ \ -" (' I '11 \J j) ,"./\ ~J - <\ />fJ;:,CJ..,-tL,!l.fI..\ I, (it \~ '\'-- ) __ i. Y ! / \ ,~ ,\, ). r7 -~';-- ",' \ , \ ~ \ Y'I\ "

'\ -s.--: pJl~ /t-<: \ ,\\ J- 1 \_, \' L-I ; ?c 't~ ,"I f'\ '. ~;-2'~.}E- \ // 71// "~" :'>.::-- I Y-' ' ( / - ,)-) l~ ~" I __ ~, __, ~ -' )-L!\,--" ) I-! .L_ \., \, , ,----,' ,--, ))"- , '

-.../ ~r"1 ) ( \)t/) 'y F'~ 1\"- I...J (\ ~ ;-"7 J~-~ /

\ l,l ) J >--1/ ,e:...(; I \ I 2.{ I. -~\ -._' "1/ -./ \ ~- V v/

X 82120145 Thin section /ocolity with B M R registered number

Record 1986/24

EVA VALLEY, NT

Fj(~ure 13 (a). Yeuralba region thin section localities

o

'2/t/:r "\

'\. / I \' w

\ \Jt

r--\ I

'" J-\' 'I --, ~~~'-\ ~)t)- t' ~ ~ t t

'< \ '\

~>-7-';-~f1 t"'--. ---"); I) r /' ( . -/) / ~f

... ~ /

\ \ 1~) 'I, ~-'.>--- ,,'\

-.1>.-"/ . ,is 1 ,.\ ..... .../

2 4 6 km

16/053-9/55

,. .. ;

~- ftp'

=

-r _ i _

~ ;Z ;;, i! ~

~ ~ lt z

S

i -~?-af ___ r /

/ //~,~./ i<~'(lt ----:--:---,-;i: ,;~ K .......... __

7-t- -

1 1,<, --.. ---.:,

NT ... -.... -1·100000

YEURAL8A;~R'GJON

COMPILATION SHEET 10

-

- '.,.

---~r.t--.· ...... • ........ -.- .-.. - ....... ....................... - ..... ... " ....... """'- - ........ __ w·· --.. .. -...... . ~ ... -:-, ..... -~~ .. ..• IIr ......... :.:;. .. ~ . ':=..-==-. . .:,

Record 1986/24

FiQur, 13 (b). V,uralbo ReVio" 1:100 000 reduction of 1;25000 compilation sheet. 16/053-9/56

I ~ §

~ .1

~., 1\ §

/,

-fzs \..~

'/ y..llL

K

I w 0-t

, / \

" ~ \

~ ,.

.,...;

.,,,. 'r I

I • '2131 . i

I I

24

23

,283

' I i I ' I , , " i \' I , I "-..... '2, I I I '- " ,

r J I / I , "V /' , i / r", ltti{,<~/, ,/ 1 'i , \

) \. ~~ I. ;'/' ( . . t. I __ ,~ --,- .. -~~.f.---~-1 .. 20 ' '\" I ... <--j _ _ ---~v _ . ~'" , I /' '-,- ~ , , I 1\ (J: I o ~" , '19 .'.\ ' /1'.1,/, ----, II" v// -\:";...--1 }' , I \' l--)

22

21

17

'"', \"" J

.~~~{ --"'-.)

",( "-..---~ .1 ( ."'

(

/ fI-~ // j. J \'! \ /' 118 (j\. "'/1 I ____ ....... , I \/ \ -~~ , "/

--"-",'" 1 ' \ '170 i ""_.1'\ ............. \ ."..- // j \ {' '\~- """ ~/ " r I II ' , ~, 'i ~,--, t,

1 \ . ~ ) \ I I 1./ , .!" '\........- '--- 1i6 '\ '\-- 1" , I '\ I'" \ '--. '\ / i-'---'--, --'--~ I l( / \-" I '-, i1, 115

'\--- I, /~ 'f"'J...~; ___ ", ( ) \ \ I' '!I ~\~ \

1,-' ,r ) I I '--', / I

/' -1 "'\. '> ~ ) I" / 114 r~ / I /' ~/-l / "-~l\ ___ f ') / , 1 I--',-/ / /'( t-, / '"" f 1 I y t -~ I, !,-' J .) , '-1 , ' I ,\ ----If, J--I13 ' \r ,-'" r \ .--.I ~_ 11- I ",,-

' '--() ',;-, I ~ t , ',_ ~ , '( '--

17

le'

/

~ t:.~ I '''''--I '\'" ,"'---ik-- ! ,I, '12 Y \~ . -f-~ . (", --~1((- ~Lr"1--- "'I) 'AI L/--1

..----/ ) \ " r'~ ), - "- / f -- ;" I ' l J / I ( / r 1 (I , ' '~'----'1 \ I .I) /') \ j. , r ' /- ~ :0.. / '( ! /'\ / -f "'v r_/ '1 k '\, jJ / I Fl1!' ;--1 4-/0 ", "t IJ 1\ \ ':\ , _ ~ 4' I I > '\ f (" Ii \ ) ,'" ,\ \ '-. "SO I \ ---J~~" q.\ / j V -, /' ' , //"l i _,"> /' j ~~ I -:;'~-I , \ ' '/ _, ,-j ;' \ j

11

__ ..J '--t"--" ( , -...\.

x 82120145 Thin soction locality witll 8 M R rog/stored number

Record 1986/24 EVA VALLEY, NT

o 2 4 6 km

Figure 14 (a). Yeuralba region thin section localities 16/053-9/57

I W '-l I

:R ~

~ ~

s ~ ;:, .. S

~ " ~ i! ::

tfuY ~ ) ..... ..-'

'" ~ . ( ~-:, I I I'

N' '\ '.-- ~~ 1( '" / 4'.

/ ~

/ ,;

r---' .... \ I /) l ',_/-1 (-/

..... to" I' .. i I'-/)L ~J K <!, \ 1...( K /\,r.. n '-u'\ C':J\" ~" ,,( ,/, -, " (z, 1''' ), ,-'/ 1') ''I -" 01 ) r Ie. J) "J'_~"" 01---)(1:"-_~ ~ ~ \ I "L. /1 ,,' <- /.' ~

'lzsulv,,)1 II I,"" (CZS - ).-{<[ -I -K~·;!Y I~, 1 -) r.-') /;::'/ K

J -,' - } '... / -'--. ..-"Y' r - f "... 0 \" I J v"... J ,'r Ie. 1\ f}' ff.,1 r) J <.I ?oF')... (}(...... k!S

1 '-ti/ /_ ( ) r/ -' \/J5.~ \I, ~V( I ~_) \ \ ( , 1_1~) "'~0Qj \ . K I~ /) r ,. '\ \ \~... •. I I. (t. I I ... 1/ I K -)~ I I. / ~ -, , ! J

U')

Of I /' .. / 1~,C/~ \~ ... , f CzsCzI I~)\ ~l ,~ J- us ..... :;- c.z, l'/~\·~')\A.'-. K ,1 'i .... ' \ \1...:~J v ~ K V) " .... 1 v 1-\

fK-l~\. ad.. l)~(~?d(K'\ Ll '\:..:~_?\ r-+ ~')~, ~ ,'If / ,;' ~ ,-~.:r, \ ..... ./, \ '.J 'If '--~ J-"" ' Y'fJ' " I J ~~( K l..,-;

. ., \

~ \ ------~--------------,-----,I~u~.~·--~----------------~----~------

EVA VALLEY NT

r:-',l,-.' '.~' ... ·1,-.

f ,~, ,..,.1 __

-, "-1M

YEURAlaA REGION

_-1'100000 COMPILATION SHEET II

Record 1986/24

;1.- ~

t .' , 1"1,; •

~ttrt""""'oI""""'Ii~,.<;'OIOQt~ ~_ ... ~-'ICIDoor.11Oft ""ttl.,. ,.,.,,..,..., ' ..... ftwr ~QI s.....,.o..par.....,.,01"" __ fn.r.,., .. pWf

" ... policy of GoYemrn.nt 1'0 .... ' "' Ihi • .,io.aflon Gn(I

...........' of ...... r.aourc.t C~ .. ot~ ..... ...... ~~ ..... ~"'CI''W'~ ........... .-.._ .................. ,.,.., .... ..., ..................................... . ................. .0 100""'-" dIr..~' M'

figure 14(b). Yeuralba RI9ioo 1:100000 r.<tllc.tkln of 1:25000 compilation sheet. 16/053"9/58

I W 00 I

.:.i:...: . .1, • ..' •••• '\ ••

,

'U'V)/ \ ,r--

091, 1 !'!/ I J' .J, ( '1~/ \~ ,-.../ ~---rt ..- --J \/' I ~

\ \ --- / ~ )-/ 081:'", (:;:::...-,.;: \'~.-l / ,,(

/ ,,) '-- I \ r ) ""l...\. -<;'-/ / // ~'\. '. "- I \ )..'/'-

071 / /;( -( \'--" ./(/ '" ~ ~ Y '\ / /-/' \)) ) ,--,>-~~ , )V---,<

061) ,zlz {/ ~ \82120130 f'\~\\.. / ~ '+-~ " ;-/, ' rt\ I / 'Y - " J -l, 1_ - :

051, V \/,~J t..:( 'Z~4)f... ".- -\ : (\~-<" ./ '" ~,-y, '-~/, UY~- 0 ~ '-\ )~ \ .( S", ilL)

04L~'1~r \\~,'\./~~,\ 0':~~::;: -( I\~(' ( / / / ~~ ~ i...j \. r-l-r""<~ ( ~ V/ / (

03~ f:-:--- \~ 't>-v --' ) .212bOti/::S-<~ LI,; ~r~(/ I-+- f 1/ f.~ It v J'-~ X - (,,"1tzI200601' -../ ~J:/,Y )..~0\ -----Fh - f--'-- '{" (-::; I'-~~~ --+'0/

021 \ I <:..,1v I ) / I (("\ ...... ~ , i. 4-. J ~' '\ \ , • y "\ r: (-''' -<.... ",,,-_,./

1 \~---A'rJ--,/ \) I'll\-, --\';/', ~,,-\ \ ~~ ; '- , ... ~ ___ ,\....{ Y\ / ')....",_ \' I I

tt ( r:...J "r / '- - \"

(( ) ;--. ,,'cL.,. \\ \"', "00 t;'· '-~ "/ - -t ~ _ ' - , ,/ -( )"' '. _ I

'- 'r-Lr( v~'C .... ..-L-' Il I ,

99L ' /) \ (\. / : --- '1'. ___.J -J. I......... j',-I : ) A -- J ) I I) V --. _/ '\ \-...-Y.) \ ~<... ,.; (,

98 I I f{,..q) '), ),v--" ' '''5 \ .4_--../ Z ) r-\~ I (' '/ \( ) ) i , '-- f' ( '" 'y- -.....( ,.-J, ~ L--"-/ '" .--./J \...-J I g'\ /) r \ ..-" ,

I 'L -<-- I /

96 A r/" '> /--

In " I "£:S:,>,

.j

\J ~ \ I

---1 '31""""[ 32 33 34 35 36 37 38 39 '40 41 42 43

III'.'

X 82120145 Thin section locality with , B M R registered numbfU EVA VALLEY, NT

Record 1986/24

·252

( J (

44

o

Figure 15 (a). Yeuralba r8Qlon thin section localities

.UI

'Z8~

I ~

---Vy \~ I Y , .......

/....i~ \ \(' -~....i \ I

,. '-,->-'""'~

\."- " \ ~ ~>---L_~"

V

" ') ( :"-y~~I'; -.... ,J ~

L if "---'\ '1)

-4{ lo...tio __ ~. I:., f •• \r\ . ....J.. •

l " t---v"'/ \ I ~, \

I \ "-, /" I ' ')l.. , --,

~ , - I

/

---r------r7'

/ J / ........ ~

).. "-. .....

}-~ L(

'v -- \ v- f' I

~~~ I

25

45 46 "

47 48 95r(~',

2 4 6 km

16/053-9/119

I W '-0 I

~

• , ~

! ~ <, ,

~[~(,rtl' M ~/S'/(7 -~/\ A W 8'" I I Co" "". , I ..... (..... _,-.

" >,',' I"j,' d ./.'-- --t-'" " / '\ ,,~ \---(. v' r' I !hk , , ..,' \ I '1hm n.,/·· ,,,--- Ihk .. ,; , .. '.0:," " .\~~ ______ _ ________

",~n"'''YY7/A'\( !X~ , /\ /.: .. " ehk. ,_/ !

EVA VALLEY NT

Ern ~

... ""'

"~"IIIOCI"

i ~(l ... "'\kl \, /~:: ~' ..

' ... ~. I \

\ .. , \

",fURAt,;BA: 'RUlON


V '~>lb~~,l.<' C'~ ,

l ' '-~; \',' '-- I \ '" '-l \.. li,

'"'I'

'j , ~ ' )

..... "' ......... _-_ ... ....-.-, .. ~ ..... ,.. ..... T.,.., - ...... __ ._ ... ,_ .... II .. ....," ....................... ....,... ... ..,......,--0-"_ :-..-:...-:=::=:.""':::..-.:, :.::..-==.-:..~~-=~ Record 1986/24

Fioure 15(b). Yturolbo ReQion 1:100 000 reduction of ',25000 compilation sheet. 16/053-9/60

J;(h\ ,

iilll K -~ _/

~~K 'r ."1.., " ~

49

~ S

~

"

E .. " ;;

S

I .j::o. o I

'\ \ __ 1 ,n..,

j --, .A~' -- v/ j I ' \ ~v. ! ;_' \ "--__ / ~\

\ '~I ""~---' \. \.. \-)/~ -1/. / _ / ) ' '/ ~ ( '-<,-( I - --:" 'I I; / ~ r <!) I,. l (" I. v _'<~

>.J" ',' / r y ~." (, \', 82.2\>0" . _k. J j /

\V \'~ I \: /11 ~. J~ j.' i'. ,~ '-,' ~ f.~ -~ . ..I,~ //. I· m;ci 0XB2'2"5'6f l '~( Y \ " / - ~.~ L..' "~'.v ", "', ,. I ,\ .. J' ~ y/ '--< =\ I., '" \. j, I J, '':1 ""7)' \ I ,( """>-_ " Ie ", ,_

;7f>~j ~.

/ j /L_ , , I,. \." , "

J '::: \" "), _, '_"~', ., ~'L.' _,I ",. """ , " , "-.. ), '. , ,.''''', " \

'\ \ \

J y_-( '-" \ , ',/'-'-j, , "

/

1

',.>-L...

'\ '.~ p' , " }', "~, "

' ~\ /' \ I f, I \ \ I c. \ '" r ~ I ~::.\ /~ : " (;< . ./"'~ \ L f '~'" V' ., , 1 \ .. I (, --<"~, , ,) / .. ", ,,-1.. .\ .... ,.{ I . -' J)... \, ., \--Z'/ I r~. , ,'=~!_. __ ...... ___ ;,;..._ }-~J ' ./~:t: ~ ,/ '~I j -ol2.-"'-f+-rf \

L \~~ I:t:. .L,"· t \ I, / I .... ~ .•. \ I fo~ f \) '( '--. "-- T \ J217.1 .... ~_ lJ/L- I,,\,o / "~I / v-~ "---,., ",11 ill

, -", 'J

. -Ie. " , -----'1", '/, \ ':" y (

.-- $ - ) l. \ \--J;" / ; \ '\ '--, ) \ \ \ r ' / '" X "-..- , , ., v r ~l\--,.~- C( "~\ !2'2,0067 X "\\ ... \~ ~/ J"..-'{ 1/

" , II 1 '''.. ~.~) . \1, " (~ \" ,\A \ j'-: 'Y~~l / V ':\1 \ .(' 1. /-'<: . I _ . ._"", I '\ \ (/ ') '~"\ \'7"'~ ~,- \ '" \.J , , ~'-.~ ::L'~ / 1 \ \~ ... "

"'-" ~~f/ I ~ "v':='" ~ '\ V, ,I' "" .'1202de~jI ~ \ __ " L

-274

_yJ

100' • ., ,_ --~+-,

'f,,,,- .. \ ,. \ '~, / \ " •• ,.q/,-" '- J y~ '\/''i\~ / L )'-.., .. :... . / ~>\S X';'('op~ ( f' .. ,w ) ;1/ I / 'V' '\, \11 '-.~:~j r..- \ ( " '\ \ , "

"-.( ./ '" I "I ~,

\ I \.',

/ ~" I 47 48

X 82120145

Record 1986/24

I

i Z52·'

. --/

Thin section locality witll iJ M R registered number

r I e2120o;56x ) " / ' , ~<:' I, Y ! / ?-r--'" I

i

EVA VALLEY. NT

! )$

Figure 16 (0). Yeuralba region thin section localities

-244

/ /---

'l-, ,I

o 2 4

/ / / \)

~ \ (

I ( , J/\

j'; ~v " ) y ~l..

'l.~(/ -11'

6 km

16/053-9/61

1 .j::.. ..... 1

§ s

~ i

s

j

~ S

EVA r" ,

• Record 1986/24

FiQurt 16 (b).

NT ...... " .. YEURALBA REGION .......

·.,.""IeG

'!.'."'-III,OO 008 COMPILATION SHEET 13

----~-~----------- ~-l

~LS,~Q K

/ /-

--\ ... ...- .. "" .... \,. '''''''

I I

) ( )

, 'L-",J

COI'fiPII"I fI\ 'lit' tIur_ or .,. ••• ~'W •• ~OIOf) .... ........ ..... , .. ,'tnlQWOliOli ....... ,.,...... r.,,_., ,""""",'" \ur ... ~ :"'J.'OI', .... "'.II ........ oN 1",,'lb • pori ,I .... ""'~c~ ,., '.Il ...... naant I, ...... , Of! " .. ,."torO"on QftIII ·a...etopm.1I1 01 __ ... 'Iao""".

() t_~tfl 01 &to", • Pw_ """ ....... -...u',...nctM .. _ ............. eo..c. Ib ... _.- ... for "'-of "* ...... tIu, .-0'_ en, ..,... .... _ euepl .. '" ' ... fI"" ""'\IIIIIoOr\" " "" q;. •.• u_.'o .. 5r •. c....."'(.It' .• 'I.uot

'--"

Vluralbo R'gion 1:100 000 r.duction of 1:25000 compilation sheet. 16/053-9/62

! ~

, S

I ~ N I

:'"

, ~'[I"1O I , ,

' t I ( ~/ \ \ \, . J' " ! y 09 .. , ", i > ~ . _,~ I (/ I '. . ~ )'") d -\ ;' -'--1) y-i-. \ ! " '. )/'. -.J / / ) / . .,. j '-~, lOB ,. t .J. (j r '. v 'r J, I _ , ,

X. "Y / G '--'. , ~l.;J/ ',~'1 / J- . ). (/! '" "'.,1

\1 ! '/ \0/ 'r 'r .. ,..t ',I , 1 101 ') (/ \- r \1.-- --'-, / J/( \ ,) ! j ,_ '-\....--r \ / r I, 1--' /'_./ I.' '_ I _', ,

("J") 1"- (/) t / / /' , j /) 1\ '1./ -:..yr\'/~106 ---I

(

.J

--,I ) ,~

71· /\

~'\

{

/ ~+---. ).--/ <> , ", \ ,/ -- / / / / ;1:,::.<. / D._, S \ '}J . ~-z / ') ~,.-{ "'1' ! 'Y'\. \~J/ !-, '-,:;r >- "\J \ J 1 (,: '--\ ('+r) \

' -j' 'n 1 >o( ~ 1/' / Y IL~ " ',' "\"'\, I /",,-. 104

I ""J', lY-'-" y '. / ,>' '\, .,,, / __ -J J" ~ ) 'x' \ . '\ IOJ . '" '\ ,,'('~.1 (..( / \ 1:"1.._ /

.' .1. , "'-..../ \ «, ".'..--__ ! I '7, /' \ ~'/", / .. , \ "

/ f\

05

' . " .. , . // \-----",/ t ~ _____ f / ~ 102 - "" .,1' r /( .,,, \- .. --1. F_._... , ., __ , / r_ -, _J ;"- --'J \ \ I ( \" __ /=, -:f~ 1 / \ i

,y . ( L'J!. ~ -~ ':" » f. y '\ '--,~ /' 'IOJ - ,rl,I-;;:~;, .I '~.::.,,-r, / f\ I /)/) \ '. " ( + /, '- - - '--Appro .. mulO / ( /'" j \ I r"-<. / ;:. /- ,\ I' \ \- ,.1 '- ''-c-

J

/.,

- /7 , , \ ~ /~ __ ' '- "'_ 1"011 I '" !'-",>, \. i I: YI.V I 1 /"_~, II / ,) ( J; ~./) >.'// ,>1 __ AI! '{._ ( '{I I I) B,swiCK, ;/ ',>--J \./ ':::Y

v \! (,- L\ / /)99

I I \) YJ / ,/ _ \ _, '-...l Y I,-).\.>\-.!:, ~ \", , 'i{ 1/ I ).j -101. ABORIGINAL / :f _\.{ ';;;"--"1,j' {( .f"''-o~ '\ 198

' \ ! , VJ \{ \ 1(> '" ./ i'/ ~ / jj-,\ . ....~ \ ()'( \ -;::? "4',.\.;--,1\ ( \'./ , I y .. , C . R'SERV' J - '~'., ... ,)"'",>,'1"'( '-, ;:/l,,::: VI / ';.. -,/ i 197

( .J (- ~'r, () I' \, f\ / /J) 1 l '--" I I f 1 /1 (\., \. ,'--\ \' ~\')- ,t- /,./ / ( J\ \ \ fJ.''- "" 1/, _~ I~. ( ,. ~ Iv'/ ~ ./ n ) I, 1 -J" I'" '" .. " P... ,I I , / \ '\. 81 82 " ,; / , '80

'c~/ / / ( 18 79 ,~r I • " __ ,' 't 76 " 1"'-) / '_, I ~ ''I / to

-244

X 82120145 Thin section locality with B M R registerfd nl,lmber EVA VALLEY, NT

o 2 4 6 km

Record 1986124 ,

Fi<Jure 17 (0). Yeurolbo re<Jlon thin section localities 16/053-9/63

I ~ W I

, ("

) -.

0 e

~

0 " r

8 ):a

o -f 0

t z en

::I

: rY

I rY

I -f

v ) ~

. . '\

~: \

>-'

"\ " ,

1--

0,

I I ,

I ~~

\.

-~,

../

y ,)

( .~

-, ... J

: '

-'/,

.

( )

. ,

>

. ''

'\''

....

.,

'.

, ~

........

.... .

'...

< ... "

-.~-~':

..

.. ~< ~:.

:j;}?:

':f:'~

"~ ~ ..

I "' .

. "

.....

'I

" , .

,. ,8 -t

t-

.. , . ...".,. ~--t-*

" I ~~ \ I , , I , \ : -, ,

I

'I I " ---'* _;--.L-~y / I '\ '-----I. ( ~./ /l / ) -,~-t' t82i202d8 I l, \ \ \ I \ (

/ /" ~, ___ , __ ~.. 1\ / ('-C>;I "~,, \" "'-1 I ,_/ '- , ~-- -' \ P~",. ~ ...... " ..... , " ) ( , '- '- " -------l~ X ' ~-\rY -,.y \' L

---...( ./ ,,\" \ /' ,_ -'-. 82120970 '! ( 1',>--- J r '----- \ \ t ,:::--:::... '--i ------\... ,rree,f "'"

) I 1-----821200!56 "-,

f I~ , X ~y , -----~

, \

252-! I

I

'244

47 ! --/ 48 r~ ~,' I ; -- -I _.~~ / '1~ . \. \ 95 ., ',- '- ( , ,

.... " , , I J

I

\, 1.---

'C / \

)

'\

94 ')

~ \

I I ~ , I /'\. \.___V

,·~lY ~L. .., /'

~i)lL

-..---'\', k .... -~,..-~ A \ A \ "" ''j._._ ( \~ (',. -' i J ~~(MAR>-~ / ...... " .... ___ '>-- ~ ~"'u/ .... , ....

-"'-- ::- 'r- -/,~ 1)1::. ~"J I \\/p J I . . \ y /Y ( J '\~\ I \ j/ I I . -j ~. \) 15

'" 93

"( \ \ " ,92 I" \ i . . \ . '\ V' r. ') ~ ~

--- i ' --"'';; ( t ----;-- \. 90 1 " T " -, ]I r, '232

V I 891 (. ..-

(-' I

91

881~,_,

87

21~-

\ \ \ - I \.. -z. .

'0,.......".1. \ .. I.

-'-<.::r,. . . r ' 212024!5-" - J82Ii0191"-;

~ \ X L/'tB2120ijB2120Itl . I, / , ' 212019~ I . __

8220199X' , '. '\ 82/20195 ./ "----/ \ V (I

'---J c:S...--- --/ -1"'- -, \ jI

') ,-- /V' \ -- J,r

~-Jt../ '\

I\. __ " i '---<:; ) I'f

\.-y" ')

\ ' I.) --,--r-",

07

'-, -/\

_/ ~ ,-,-

/'

----"

/

~'\..1 140 "' Ii! / ( • r

13~40 5{) 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 ~67 68

X 82120145

Record 1986/24

Thin section locality witli B M R rBgisfflred numbtu MARAN BOY, NT

Figure 18 (0), Yeuralba region thin section localities

o 2 4 6 km

16/053-9/65

1 .j::>.

Lrt 1

4b

~

"i ~

s I.

I'~~- N~ - J ') K " , ~r\~ _/ (~- \ l, ClS.cIw,_~( " r ._/" \/r~ /r.J I '\ ~~

t4·J~·1 f~

MARANBOY

r~' ~""~ I . i ) ,t ' .. "'1 L i i ,.)

NT -, c..,....

-''''00000

Record 1986/24

•••

YEURALBA

COMPILATION

' c~ ~~<Y) , '~ Ji«j{$~ ~' ~~~i1t ""', ,'-- ) ~ ,) OW, )dll, 't )fbt' , ,~ \ Jeu ,~~;"--; _ mp, 1Jw £Iwz L, ~ Qa \ £-1 -r (~l'f ~. >_" ~~<: I ;/,y---, bt ,,~

:i.:

REGION

SHEET 15

~ Dr 'hi 1Iw.au of ...... 111 R.KIW't .. , G.0I0fr and ~'. 11'1 c~l.bon:Il.,.. ""n It .. Irb...." r_n1IDr} lHvIo9cal s.....,. o.artme,. d ...,.. and ''*9)' • ,.... ~ IN JMIfI~Jot ~t'WtIIrd lIP 0 .... ' In"'" ... ptorgllOftaM ~lol""'''''r.IOIonI.'

O~ot&wlt" ~~.,....~., .. __ IfIOr~

..... thtir_ ... Ot,., ... "' ..... ~, ... ftU4 ..

:: .::.:;::.::;:. -;.~': ~~ ~

Fioure IS(b). Yeuralb(l Reoion 1:100 000 r.duc.tion of 1:2~ 000 compilation sheet. 16/053-9/66

I .j::..

'" I

X 82120145

./ (

,/" ~/

76

/ /' 95

/- /1'

94

93

92

91

.... 1;-

) -f "'1\-....;;~-!~neg- ), "- ~ \..; '-'k, '/~

, ,....j-" .... ~r-..:-~- " < .... y ..... Ii, \' /(, HIU.J .,.. . ,;t-' "'myl )) -4Z..;< ):.J

I · ..... .,..-1' - ~---- \ ~: r \ J l ,)---, ..... ....-... : l ~j I '-.... I :::---.L Jl ::....,..t ' "~' 1---1..J f"....'

r~~201$1 / "'.'\ / 1 I ISY ) .... ~-a212019~/' , /"- \. .; , 92120195 / ' I ..... __ "Ct,~ ;/. J

V \'" '/', r ( ~. \ ... !' / \ J '--'~r 1= --~+---......,. .. /~ .. __ .- ---\-~')~--'-'7--~" '-~--'-190

f /'>-t t j ~ fi-'" -' __ .~' t' r 1', ~ ...... I' J89

I '- _, It ' I " \\O\\. :. \ BESWICK /

/ 1 t.....:ri I , \'; I ;) 188

~<f'/ ) '\,;t . I ' } I\-{ '/ // II~: 3:1'

,4 65 66 5067 68 69 70 71 72 73 74 7513Z"~5°

''--.

01

'/ I' I / 1"--77 78 79

Thin section locality witll B M R registered number

o 2 4 6 km MARANBOY, NT

Record 1986/24 16/053-9/67 Figure 19 (a). Yeuralba region thin section localities

1 .p. '-l 'I

~ .. i J

~ ~

:0 ~.

s

II

-------- -

1-' ; ) 131"5.'· ,.. -1 ,I', ._-- '.' >/--';'-~:'::':": . ./ ............

" I, II III i'. HO !> I 8/ 83 84 III 00 --------- - _.---------- ............--- 96" ,.

........ --------", I, 9~

\' 'I <J4

,...~--A------r------

/

I <' ,- A

<:! \ \ 'I ./ \ '\ ,/ • eUI \"" I 11 ,/ ;-

, .... .... --- ......

Vd ,}.-'f - ,,';..', '<c "V"'" 'I I .).1 /k .-,- , Ow,) w - I "I '/./ / ~

u {'- ,:, I I I 11 ~ ---~ ·'1 I (I,! '-"r(J-,-~,,;i£'d"~ ! f?WICK "J' \ ~ ~ .. ~/r"1 -~_?' \ \.l (z / j fUI 'V'~' I'" I /.e",,"~/l J,l;;'/ I" / - " ." / - A· L f:;Lp / V\..I "1/ __

'- -' / ? _ ... '" '""'/( C' UI /,iJ.Vy' ' ' / -1-7 :<,0... f l...:- .J.--.,..-r- ~/ f ~'"'T''' II?, '/ Pui -?"/-~ ""- ,~-C \ \/, 'tIl -- ---t;-==---,. - / I ) I Qa \ ",/~~"/,, / CI~-;::--CZ/lJ.f-(.l " ll> '\ ~D \ Iji" } 'I; ;

- '- ~ / IL /)-tUi f ~ _. -, - 0"-// "( / / ---.l. I, I ,,'IS :. ~ /~ .. '" 1'/ 'l!u,1 -- \- <' --. '\ '!Lv 15,'Sl'

I' V-' lii \ ~ \ H'I~'I" ~/ c, \ \ 'e

I \ <_'"

I ',,'" l \ "

'<" "It""

'\

"- , "-" , , ....

. .

1(, ,

YEURALBA REGION MARANBOY NT

f'-·r--~

jJj ="'~, Record 1986/24


" .... ....

\

"-

\ ,'\.

" "-" ,

'-

........

,

' .... ....

. ,..

-, '

:,

-.: 1 'r]

<J?

'-'\

.'1 I \ -1: -, -

"\ , I '\ -" \ , " " \ , ....

-, 'A.·d.'''r'~ . • : I '1/1 L .....

/-------

/, 11

~ lap II,.. .... _ f:A ....... '01 R.~ •• Ge~, onct ~-'. In colhlbarohCln .,tt. It,.. ,*",tt..m r ... ,dOf, ~aI Sww,. Oeportlftetlf of ..... lind E'*W • ,a1

eM' !hi 1KIItC, of a--nment to II .... ' '" ItIt eapforQflOl'l ....

~"f 01 "",",nIiI 'Itourc .. o c--.a., .. of _Jr_ Pw ..... ~~ ... o, .. ".,....,~ 1t ...... u.rI __ .. lhottf .... Matt,. ......... ., .... ~~ .......... ..,.,.,_IIWt .. lie (hcklr •• "".~" n,c....c,.a.,.AOT ItO

'II

, 'Hi

H'i

fir.

HI

Ht.

k~

Figure 19(b). Yeurolbo Region 1:100 000 reduc.tion of 1:25 000 compilation sheet. 16/053-9/68 '/

I .j::>. 00 I

U H o lSI o U)

!:il ~

-49-

TABLE 1: SUMMARY OF STRATIGRAPHY OF THE YEURALBA REGION, N.T.

Unit

CRETACEOUS K

o

JINDARE SANDSTONE 8lw

ANTRIM PLATEAU 8la

o B . H p., Ul O:::~

o 80::: ~0

KOMBOLGIE 0::: FORMATION ~ Bhkl H 0:::

!:il Z H McADDENS ~ p., VOLCANIC ~ gMEMBER ..:t: P::::Bhm ~ .0

CREEK

description

Fine white sandstone, yellow-brown ferruginuous friable sandstone kaolinitic in places, minor siltstone

UNCONFORMITY

Fine-coarse commonly ferruginous sandstone, arkose, laminated and brecciated chert

Fine basalt, vesicular in places, minor sandstone intervals near base

UNCONFORMITY

Flaggy quartz sandstone

field relationships

Unconformable on older units: forms extensive tablelands with sandy aprons

Appears to unconformably overlie Antrim Plateau Volcanics

Unconformable on older units: sandstone interbeds may be equivalent to part of Jindare Sandstone

No relationships apparent in region

?UNCONFORMITY

Coarse buff-white sandstone, commonly poorly sorted pebbly and clayey, minor siltstone

Dark grey andesitebasalt, vesicular in places

UNCONFORMITY

A conformable sequence, resting with slight angular unconformity on Plum Tree Creek Volcanics and highly angular unconformity on Tollis Formation

P-! ::> 0 p:; 0

p:; IJ;:l

> H p::;

:I: E-i H C\ IJ;:l

U

H

0

IS]

0

p:;

j:ij

E-i

0

0::

P-!

:>-I

H

0::

.::r: j:ij

Unit

PLUM TREE CREEK VOLCANICS Bep

FANNY RHYOLITE MEMBER Bepf

GRACE CREEK GRANITE Beg a,b,c,d

-50-

description

Red-brown glassy to fine ignimbrite commonly with xenoliths; minor redpink or purple rhyolite, banded, spotted or agglomeratic, rare sandstone

White to purple-brown rhyolite

fine to medium-grained equigranular to porphyritic, grey-pink microgranite

HINDRANCE CREEK feldspathic sandstone, SANDSTONE Beh arkose, minor

conglomerate

EVA VALLEY GRANITE Bgv

YEURALBA GRANITE Bgy

MARANBOY PORPHYRY Bmp

MAUD DOLERITE Bdd

UNCONFORMITY

Fine equigranular and fine to coarse porphyritic leucogranite

Medium to coarse equigranular tourmaline-biotite leucogranite, extensive greisen alteration

Medium-grained feldspar porphry

Medium-grained dolerite

field relationships

Probably conformable on Hindrance Creek Sandstone

Contact not seen

Contacts obscure owing to similarity between outer, microgranitic, part and surrounding ignimbrite of Bep

Hornfelsed by Grace Creek Granite

Intrudes and hornfelses Tollis Formation; no contact effects visible near contact with Grace Creek Granite.

Intrudes and hornfelses Tollis Formation, unconformably overlain by Cretaceous

Intrudes Tollis Formation, unconformably overlain by Cretaceous

Intrudes Tollis Formation, faulted against Eva Valley Granite, apparently overlain by Plum Tree Creek Volcanics

~ Z ~ 0:: i:iI

U ::c:o.. H Ul~ 0 0 N HP::: 0 J:LI~ 0:: ". i:iI E-t 0 0:: ~ 0.. Z

~ :>-t P::: H i:iI 0:: ::c:o.. ~ Ul~ i:iI 0

HO:: i:iI~

Unit

Bbi

TOLLIS FORMATION Bbt

-sy-

description

Greywacke, tuff rhyolite and porphyry

Greywacke, siltstone, argillite, minor tuff

field relationships

Forms apparent syncline within Grace Creek Granite faulted against PLum Tree Creek Volcanics

Oldest unit in the Yeuralba region, intruded by Maranboy Porphyry, Maud Dolerite, and Eva Valley and Yeuralba Granites and related hydrothermal veins

-52-

TABLE 2. CHANGES IN STRATIGRAPHIC NOMENCLATURE IN THE YEURALBA REGION NEW NAMES. VARIATIONS OF NAMES. AND RELEVANT DEFINITIONS. HAVE BEEN

APPROVED BY THE STRATIGRAPHIC NOMENCLATURE COMMITTEE.

Walpole & others 1968

not recognised

not recognised

part of Grace Creek Granite

Edith River Volcanics

This Record

Jindare Sandstone

Fanny Rhyolite Member

Plum Tree Creek Volcanics

Grace Creek Granite Grace Creek Granite

Hindrance Creek Hindrance Creek Sandstone Member (of Sandstone Edith River Volcanics)

Yeuralba Granite Eva Valley Granite (northern mass)

un-named granite Maranboy Porphyry

un-named dolerite Maud Dolerite

Burrell Creek Formation Tollis Formation

Conunents

new name

new name

new name: extends into Stow region to N where it has been redefined (previously Plum Tree Creek Volcanic Member of Kombolgie Formation·) by Needham & StuartSmith (1985)

name discontinued

new definition

elevation to formation status

new name

new name

new name

new name

-53-

APPENDIX 1

SAMPLES COLLECTED FOR AGE DETERMINATION

Sample No. grid ref.

83126007 KE602337

83126008 KE563353

83126009 KE572421

83126010 KE630446

83126011 KE637446

83126012 KE646432

83126013 KE629414

83126014 KE626392

83126015 KE661376

83126016 KE644375

83126017 KE650355

rock type

granite

microgranite

ignimbrite

microgranite

microgranite

microgranite

microgranite

microgranite

microgranite

microgranite

microgranite

stratigraphic unit

Eva Valley Granite

Grace Creek Granite

Plum Tree Creek Volcanics

Grace Creek Granite

Grace Creek Granite

Grace Creek Granite

Grace Creek Granite

Grace Creek Granite

Grace Creek Granite

Grace Creek Granite

Grace Creek Granite

technique

U-Pb Zircon

IRb-Sr

I total

U-Pb Irock Zircon

-54-APPENDIX 2. THIN SECTION DESCRIPTIONS

The first line of each entry records BMR sample number, rock

type, AMG grid reference, and compilation sheet number

TOLLIS FORMATION

82120031 BANDED IRON FORMATION KE649243 6

Laminated microcrystalline quartz mosaic and granular

magnetite, with coarser grained secondary hematite and

cross-cutting quartz-hematite veinlets

82120054 VOLCANOLITHIC PEBBLE CONGLOMERATE KE655307 6

Rounded pebbles, <1 cm, of Fe-oxide - stained and

altered pitchstone, minor vein quartz, chert and mafic

volcanics, in a coarse poorly sorted matrix of quartz,

and metamorphic chlorite, epidote, Fe-oxides and white

mica

82120055 MUSCOVITE HORNFELS KE538080 13

Fine mosaic of muscovite and hematite veined by quartz,

with coarse poikilitic muscovite along altered margins.

Meta-shale

82120056 TOURMALINISED SILTSTONE HORNFELS KD605967 13

Graded laminae of very fine subidioblastic tourmaline,

quartz, muscovite and minor hematite. Laminae vary from

quartz-rich to tourmaline-rich and represent replaced

pelitic bands. Hornfels texture

-55-

82120061 PELITIC HORNFELS KE643312 6

82120062 TOURMALINISED GREYWACKE HORNFELS KE536075 13

Poorly sorted sub rounded fine quartz and chert in a

recrystallised matrix of quartz and tourmaline

82120067 FERRUGINISED PELITIC HORNFELS KE587012 13

Fine white mica and blades of hematite with minor

patches of coarse poikilitic muscovite (showing Fe

oxide penetration along cleavage planes), and very

minor quartz

82120068 DEVITRIFIED VITRIC TUFF KE387026 12

Microcrystalline quartz, sericite, chlorite, secondary

Fe-oxides, minor scattered angular to rounded very fine

quartz crystal fragments. Relict eutaxitic texture

82120070 TOURMALINISED SILTSTONE HORNFELS KD625982 13

Recrystallised fine muscovite, in places poikilitic,

quartz, and scattered rounded quartz grains <0.2 mm,

and fine secondary hematite. Quartz veinlets surrounded

by disseminated tourmaline haloes

82120073 PELITIC CORDIERITE HORNFELS KE539226 10

Very fine poikilitic muscovite, biotite, minor quartz,

?cordierite, and secondary Fe-oxides, with rare

prismatic tourmaline. Spotted appearance from

cordierite-muscovite intergrowths

-56-

82120121 COARSE LITHIC METATUFF KE654307 6

Poorly sorted sub rounded clasts <3 mm of altered

devitrified pitchstone, heavily impregnated with Fe

oxides; minor altered (white mica) plagioclase crystals

and chert. Fine metamorphic biotite and minor muscovite

throughout

82120191 TOURMALINISED GREYWACKE KD638912 15

Very poorly sorted coarse subangular quartz, chert,

minor felsic volcanic rock fragments, and fine white

mica aggregates after feldspar, in a subidiomorphic

tourmaline and fine white mica matrix. Rare rounded

detrital zircon. Tourmaline concentrations close to

open fractures

82120193 QUARTZ-TOURMALINE ROCK KD626916 15

Fine mosaic of subprismatic tourmaline and quartz.

Recrystallised breccia texture with relic cherty clasts

and patches of mosaic quartz-tourmaline in a more

tourmaline-rich matrix. Late tourmaline veinlets

82120194 VOLCANOLITHIC GREYWACKE KD637909 15

Coarse, very poorly sorted angular clasts of felsic

volcanics, quartz grains and minor plagioclase, Kspar

and phyllite, with fine metamorphic chlorite, white

mica, rare tourmaline, and minor detrital zircon

82120195 METAMUDSTONE KD637909 15

Weakly foliated microcrystalline sericite and minor

chlorite impregnated by secondary hematite granules

-57-

adjacent to fractures

MAUD DOLERITE

82120196 METADOLERITE KE648308 6

Medium-grained ophitic colourless clinopyroxene

marginally replaced by pale green to colourless fibrous

amphibole, moulds euhedra1 plagioclase. Rare anhedral

quartz, minor opaques

MARANBOY PORPHYRY

82120192 QUARTZ METAPORPHYRY KD626916 15

Scattered embayed quartz phenocrysts <3 mm and lesser

altered (white mica and Fe-oxides) feldspar, in a fine

quartz-muscovite base, with secondary Fe-oxides. Minor

aggregates of tourmaline and coarser patches of

muscovite indicate later alteration (contact

metamorphism?)

82120199 PORPHYRITIC HORNBLENDE GRANITE KD616908 15

As 82120245; rare relict colourless clinopyroxene cores

within amphibole grains

82120245 PORPHYRITIC HORNBLENDE GRANITE KD615916 15

Strongly porphyritic; rounded subhedral phenocrysts of

altered plagioclase <5 mm, subprismatic hornblende and

minor chloritised biotite in a fine groundmass of

anhedral quartz, Kspar, hornblende, apatite and zircon

-58-

YEURALBA GRANITE

82120251 EQUIGRANULAR BIOTITE-MUSCOVITE

LEUCOGRANITE

KE543216 10

Medium-grained subhedral microperthite 50% and

oligoclase 5%, anhedral quartz 40%, muscovite 2%,

biotite (with zircon inclusions) 1%

82120252 EQUIGRANULAR MUSCOVITE-BIOTITE

LEUCOGRANITE

KE615204 10

Coarse subhedral microperthite 50% and oligoclase 5%,

anhedral quartz 40%, biotite 2%, muscovite 1%

EVA VALLEY GRANITE

82120126 PORPHYRITIC BIOTITE GRANITE KE637316 6

Minor megacrysts of subhedral plagioclase and quartz to

1 cm in a medium-grained (1 mm) groundmass of anhedral

quartz, Kspar, euhedral plagioclase, biotite, minor

hornblende, muscovite, fluorite, zircon and opaques.

Biotite altering to chlorite and plagioclase to white

mica and fluorite

82120127 PORPHYRITIC BIOTITE GRANITE KE604337 6

Megacrysts of plagioclase, perthitic Kspar and anhedral

quartz to 1 cm, in a coarse groundmass of anhedral

quartz, Kspar, biotite, minor subhedral plagioclase,

trace muscovite, apatite, zircon and opaques

-59-

HINDRANCE CREEK SANDSTONE

82120173 VOLCANOLITHIC QUARTZ SANDSTONE KE673303 7

Coarse, poorly sorted angular quartz, chert, altered

(hematised and kao1inised) volcanics, kaolinised

?feldspar and rare phyllite/sericite schist, in a

clayey matrix. Rare detrital zircon

GRACE CREEK GRANITE

82120133 PORPHYRITIC MICROGRANITE KE505233 10

Eroded and embayed phenocrysts (?xenocrysts) to 5 mm of

quartz, plagioclase, and aggregates of biotite,

magnetite, apatite and zircon in a microcrystalline

base of anhedral quartz, Kspar (dusted by hematite),

minor biotite, trace apatite and zircon. Secondary

chlorite and epidote. The mafic aggregates may be

original euhedral biotite crystals altered to opaques

and surrounded by poikilitic greenish brown biotite

crystals.

82120135 XENOCRYSTIC FINE BIOTITE GRANITE KE483216 10

As 82120151; xenocrysts <5 mm, hornblende mostly

altered to chlorite

82120136 PORPHYRITIC COARSE SYENITE KE688306 7

Xenolith. Anhedral Kspar phenocrysts to 1 cm in coarse

Kspar, quartz, minor plagioclase and clinopyroxene.

Most grain boundaries are sutured and recrystallised to

fine polygonal aggregates containing metamorphic

0'

-60-

biotite. Clinopyroxene is rimmed by metamorphic

biotite. Trace zircon and opaques. About 10% quartz;

plagioclase is <10% of total feldspar

82120138 PORPHYRITIC COARSE GRANITE KE565300 6

Felsic xenolith. Coarse subhedral microperthite

phenocrysts to 1 cm rimmed by, and in a medium to

coarse groundmass of, sericitised plagioclase, anhedral

alkali feldspar and quartz (commonly graphically

intergrown), chloritised biotite, and opaques, with

trace zircon and carbonate. The groundmass and rims are

dusted by very fine hematite. Quartz 20%, plagioclase

10%, chlorite/biotite 5%

82120140 XENOCRYSTIC FINE GRANITE KE504345 6

As 82120147; minor secondary epidote


As 82120147; feldspar xenocrysts to 1 cm


Similar to 82120133; eroded and embayed phenocrysts

(xenocrysts?) to 1 cm of plagioclase (with clay

alteration), quartz and minor Kspar and chlorite

aggregates (after biotite), in a microcrystalline base

of anhedral quartz, stubby Kspar crystals, and chlorite

(after biotite), opaques, apatite and sphene. Feldspars

cloudy and reddish from very fine hematite alteration

-61-


Similar to 82120142; xenocrysts to 5 mm, minor

carbonate alteration, and some micrographic

intergrowths of quartz and Kspar in the groundmass

82120144 PORPHYRITIC MICRO-LEUCOGRANITE KE565349 6

Phenocrysts of alkali feldspar, sericitised

plagioclase, and minor rounded quartz, in a groundmass

of anhedral quartz and Kspar which are commonly

micrographically intergrown. Minor secondary chlorite,

opaques, and <1% primary biotite


Subhedral phenocrysts to 4 mm of plagioclase crystals

or aggregates, in a very fine groundmass of quartz

Kspar micrographic intergrowths, chloritised biotite,

and secondary carbonate and sphene. Accessory zircon,

apatite, and rare garnet showing chlorite alteration

82120146 PORPHYRITIC FINE BIOTITE GRANITE KE571349 6

Euhedra1 plagioclase phenocrysts to 3 mm in a fine base

of graphically intergrown quartz and Kspar, euhedral

plagioclase crystals, biotite, and secondary chlorite

and carbonate. Accessory apatite and opaques


Eroded xenocrysts to 5 mm of Kspar and quartz, and

euhedral plagioclase (hematite dusted), in a fine base

of graphically intergrown quartz and Kspar (commonly

surrounding minor euhedral plagioclase or Kspar

-62~

crystals), chloritised biotite, and accessory apatite

and opaques

82120148 PORPHYRITIC GRANITE KE688306 7

Scattered eroded xenocrysts to 5 mm of quartz, Kspar,

plagioclase and minor clinopyroxene, in a fine base of

anhedral quartz, Kspar crystals, minor biotite,

subhedral plagioclase, hornblende, opaques, apatite,

zircon, and secondary carbonate. Clinopyroxene

xenocrysts rimmed by biotite and hornblende


Subhedral phenocrysts and aggregates to 5 mm of

sericitised oligoclase and rare Kspar in a

microcrystalline groundmass of anhedral Kspar and

quartz, mostly forming graphic intergrowths, with

patches of chlorite, sphene, apatite, opaques and

epidote after mafic minerals, forming 5% of the rock

82120150 XENOCRYSTIC FINE GRANITE

As 82120147

82120151 XENOCRYSTIC FINE BIOTITE

HORNBLENDE GRANITE

KE756494 3

KE669314 7

Eroded xenocrysts to 5 mm of Kspar and plagioclase,

hornblende-biotite aggregates, and minor quartz, in a

fine base of anhedral quartz, Kspar and minor subhedral

plagioclase, biotite and hornblende. Accessory opaques,

apatite and zircon. Hornblende rims some biotite crystals

-63-82120152 XENOCRYSTIC FINE BIOTITE- KE639331 6

HORNBLENDE GRANITE

Xenocrysts/phenocrysts to 5 mm of Kspar, plagioclase,

minor quartz, and hornblende-biotite aggregates, in a

fine base of anhedral quartz, Kspar, biotite,

hornblende, plagioclase, opaques, apatite and rare

epidote

82120153 EQUIGRANULAR FINE-MEDIUM GRAINED

HORNBLENDE-BIOTITE GRANITE

KE699378 3

Fine to medium grained equigranular anhedral quartz, .

Kspar, minor subhedral plagioclase, biotite,

hornblende. Trace apatite, zircon, opaques

(magnetitic). Minor chlorite alteration of mafic

minerals

82120154 XENOCRYSTIC FINE HORNBLENDE

BIOTITE GRANITE

KE646505 2

Similar to 82120151; extensive chlorite-epidote

alteration of mafic minerals; xenocrysts to 1 cm

82120155 EQUIGRANULAR FINE TO MEDIUM

GRAINED BIOTITE GRANITE

KE672383 3

Fine to medium grained anhedral quartz, Kspar and

lesser subhedral (kaolinised) plagioclase, with minor

partly chloritised biotite. Accessory opaques, apatite

and zircon. The altered plagioclase forms rare

xenocrysts to 5 mm

-64-

PLUM TREE CREEK VOLCANICS

82120078 IGNIMBRITE? KE367177 9

Euhedra1 phenocrysts of Kspar, sericititsed

plagioclase, and minor chlorite clots after mafic

mineral (mostly altered to Fe oxides), in a mosaic

quartz-Kspar groudmass. Secondary Fe oxides, white mica

82120079 DEVITRIFIED VITRIC CRYSTAL TUFF KE343027 12

Angular crystal fragments and splinters of quartz,

Kspar and plagioclase to 0.2 mm, in a devitrified

ch10ritic base. Fe oxide granules. Eutaxitic fabric

preserved in places

82120081 RHYOLITE? KE458200 9

Phenocrysts to 1 cm of embayed quartz, rounded Kspar and

euhedra1 sericitised plagioclase, in a microcrystalline

mosaic groundmass of quartz, Kspar and opaques (Fe

oxides). Very minor oxidised biotite

82120092 ALTERED RHYOLITE KE492213 10

Scattered embayed and eroded phenocrysts of quartz and

kao1inised? feldspar to 3 mm, in a microcrystalline

base of quartz, white mica, minor altered (white mica

and Fe oxides) biotite, and radiating Fe oxide

microlites

82120129 BANDED IRON FORMATION KE570425 2

Laminated microcrystalline quartz and hematite (minor

magnetite). Laminae disrupted and brecciated. Scattered

-65-

angular quartz grains may be disrupted veins


Euhedral and rounded phenocrysts of quartz to 4 mm, and

minor euhedral feldspar (completely replaced by a

prismatic colourless high relief mineral - probably

diaspore?), and sericite, in a groundmass of alkali

feldspar, quartz and sericite

82120131 VOLCANOLITHIC GREYWACKE KE570419 2

Coarse, angular, and very poorly sorted quartz, felsic

volcanic rock fragments, plagioclase, and Kspar, with

very minor detrital muscovite, in a Fe oxide-stained

recrystallised biotite-muscovite matrix

82120132 WELDED FELSIC TUFF - IGNIMBRITE? KE9l6352 8

Rounded to angular fragments of fine-grained felsic

volcanics, kaolinised feldspar, and quartz crystals, in

a devitrified siliceous base which is extensively

fractured, quartz veined, impregnated with Fe oxides,

and altered to clay

82120134 FINE GREYWACKE KE563413 2

Fine, poorly sorted, angular quartz, chert, and rare

?felsic volcanic rock fragments, in a weakly foliated

matrix of fine white mica, chlorite/biotite, and

opaques. Quartz vein

-66-


Scattered subhedral rounded phenocrysts of altered

feldspar (clay, Fe oxides and quartz), and minor

quartz, in a devitrified brown glassy base with a weak

?spherulitic fabric. About 20% of the feldspar

phenocrysts are now fine hematite dust and quartz (i.e.

no clay), and were probably Kspar

82120139 ?RHYOLITE KE570425 2

Eroded phenocrysts to 3 mm of quartz, Kspar,

plagioclase, a mafic mineral (now chlorite), and

smaller opaque grains and apatite crystals, in a

devitrified hematised base containing radiating

microlites, and minor patches of microcrystalline

anhedral quartz and stubby Kspar crystals

ALTERATION ZONES AND DYKE ROCKS

82120208 GREISEN KD615988 13

Fine anhedral quartz and muscovite, very minor opaques

and rare tourmaline veinlets

82120240 LAMPROPHYRE KE686304 7

Strongly porphyritic; phenocrysts of eroded

plagioclase, colourless pyroxene (marginally altered to

biotite), and very minor quartz, in a microcrystalline

quartz-feldspar base with biotite and trace zircon,

apatite, epidote, chlorite, and opaques

-67-

82120244 OLIVINE DOLERITE KE845340 8

Medium grained ophitic colourless clinopyroxene moulds

altered (white mica) plagioclase laths, rounded

fractured and altered (green-brown ?chlorite, Fe

oxides) olivine, and chloritised biotite. Accessory

opaques and rare interstitial quartz

82120259 SYENITE KE620345 6

Fine anhedral equigranular cloudy (hematite dust) Kspar

with crystal faces growing into cavities filled by

quartz. Rare subhedral altered plagioclase. Accessory

zircon. Quartz veins replace feldspar in places. Quartz

<10%

bureau of mineral resources, geology and ...bureau of mineral resources, geology and geophysics...

Documents