cl ca fe cu ag pt au - duke university
TRANSCRIPT
.
0 km0 km
Greenland
MBS
Glacial Ice
Water
Gneiss
Marginal Border Series
Lower Zone
Middle Zone
Upper Zone
Upper Border Series
Bassistopen Sheet
Basalt
Sandwich Horizon
Triple Group
0 km
N
Skaergaard Peninsula
Mellemo Is.
Ivnarmiut Is.
UttentalPlateau
Pukugagryggeen 1111’
12 13
22
41
4650
32
05
09
33’
Intrusion boundary
Sample Location
68º 08
’ N
31º45’ W
68º 13
’ N
31º35’ W
Basalt
UBSBS
BSUZbUZc
UZa
MZ
LZcUZa
LZb
LZa
MZ
UZb
Gneiss
Kraemer Is.
Uttental Sound
2 km
Na Mg SAl K
Ca Fe AgCu
Cl
Pt Au
HZLZa
LZb
LZc
MZ
UZa
UZb
UZcUZc’
UZb’UZa’MZ’LZc’LZb’LZa’
UZb*U
Za*M
Z*LZc*LZb*
LZa*
***************
0
1.0
2.0
3.0
PR
Stra
tigra
phic
Hei
ght (
km) Digenite
Bornite
Pentlandite
Chalcopyrite
Orthopyroxene
Clinopyroxene
Calcite
Biotite
LZa
LZc
Apatite
UZa
UZb
MZ
Low-Ti Magnetite
a
Other
plag
iocl
ase
oliv
ine
Ca-
rich
pyro
xene
pige
onite
ilmen
item
agne
tite
apat
itefe
rrobu
stam
ite
quar
tzK-
feld
spar
tridy
mite
cb
LZb
Legend
(n = 38)
(n = 13)
(n = 7)
(n = 54)
(n = 36)
(n = 29)
mtCu
ccpcpx
opxplag plag
ccpccp
bn
pnmt
bn
ccp ccp + bn
biotite
Cu
opx
high-Ti mt
cpx olol
mt
Ag
bnCu-Fe-S oxide
bn
ccp
ol
Cu
a b
d e
40 µm 50 µm
50 µm 40 µm
high-Ti mtol
ol
cpx
opxplag mt
bn
bnol
biotite
plag
mt
opx
40 µm
40 µm
f
c
An# = 66
An# = 50
An# = 72
An# = 33
An# = 47
An# = 61
10µm
Ag
cpxapatite
plag low- Ca plag
AgAg halide
Cl-rich inclusioncalcite
plag
plag
Ag
Au
Cu calcite
cpxvug
Ag-Zn alloy
CuCl
cpx
a
d e f
10µm
Ag
Ag halide
cpx
ol
10µm
c
10µm 10µm
10µm
b
low- Ca plag
Agplag sul�de
Agqtz
cpx
�uid inclusion?
10 µm
Silver Map
a B
c Ag
Ag
AgCl
1099
824
274
549Coun
ts
X-Ray Energy (KeV)1.79 2.49 3.07 3.71 4.35 4.99 5.63 6.27 6.91
d
503
1007
1511
2015
0.00 1.28 2.56 3.84 5.12 6.40Co
unts
Cl
SiNa
K
CaFe
Ca
O
SCa
b
b
d
Mg
Al
10 µm
halite
sylvite
halite
Au
plag
Na
K
40 µm
10 µm
Pt-Au
plag
plag
Pt
cpx
bn
high-Ti mt
cpx
b
a
amph
ap
apamph
amph
a b
c d
b
d
vapor
solid
vapor
vapor
�uid
500 μm
500 μm
200 μm
200 μmalteration
LZa LZb LZc MZ UZa UZb
0.2
0.4
0.6
0.8
Loss
on
Igni
tion
(wt.
%)
0.050.15
0.25
∑ (low
-Ti mag m
ode)/∑
(sulfide mode)
0.01
0.1
1
10
100
1000
0.01
0.1
1
10
100
1000
0.0010.010.11
Weight fraction of melt (F) in the system
[Ag]
in s
ilicat
e liq
uid
(ppm
)[Ag] in volatile (ppm
)
Liquid
Vapor
MORBHawaii
Hawaii
MORB
Ag saturation = 5.5 ppm
0
0.2
0.4
0.6
0.8
1
1.2
0 0.002 0.004 0.006 0.008 0.01 0.012
Cr/C
o
Fraction Water Evolved
0.1
1
10
100
1000
0 0.002 0.004 0.006 0.008 0.01 0.012
Cf/C
o
Fraction Water Evolved
0
0.2
0.4
0.6
0.8
1
1.2
0 0.002 0.004 0.006 0.008 0.01 0.012
Cr/C
o
Fraction Water Evolved
0.1
1
10
100
1000
0 0.002 0.004 0.006 0.008 0.01 0.012
Cf/C
o
Fraction Water Evolved
Dfluid = Dsulfide
sulfi
de o
ut
m Cl = 1
m Cl = 5
m Cl = 10
m Cl = 20
a
c
b
d