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PRELIMINARY GEOLOGIC MAP OF THE NORTH HALFOF THE SPIRIT MTN. NW QUADRANGLE,

CLARK COUNTY, NEVADA AND MOHAVE COUNTY, ARIZONA

P. Kyle House and James E. Faulds2008

OPEN-FILE REPORT 08-5 PRELIMINARYGEOLOGICMAP OFTHE NORTHHALF OF THE SPIRIT MTN. NWQUADRANGLE,CLARK COUNTY, NEVADAANDMOHAVE COUNTY,ARIZONA

Prepared aspart of theSTATEMAPcomponent of theNational CooperativeGeologic MappingProgram in cooperation with the U.S.GeologicalSurvey

Symbology (perFGDC-STD-013-2006)

NEVADABUREAUOF MINES ANDGEOLOGY

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CWAJB02-1

11437'30"W

11437'30"W

11440'0"W

11440'0"W

11442'30"W

11442'30"W

3522'30"N 3522'30"N

3530'0"N

3527'30"N

3525'0"N 3525'0"N

05

705000m.E

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710

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3917000m.N

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1 2

4 6

7

1 IretebaPeaks2 MountDavis

3 MountPerkins4 Fourth of July Mountain5 SpiritMtn.NW6 SpiritMtn.NE7 SearchlightSE8 SpiritMtn.9 SpiritMtn.SE

Adjoining7.5'quadrangle names

3

8

Mainly strike-slipfault Solid where certain and locationaccurate,long-dashed whereapproximate, dotted whereconcealed; queriedifidentity or existenceuncertain. Arrowsshow relative motion.

Normalfault Solid where certain and locationaccurate, long-dashedwhereapproximate, dottedwhere concealed;queried ifidentityor existence uncertain. Ballon downthrown side.

Strike anddipof bedding

Inclined15

?

?

9

5

Tephra Bed

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OTHER UNITS

MIOCENESTRATA

PROTEROZOIC (?)

Dacitedikes (middleMiocene)

MIOCENEINTRUSIONS

Calcite veins (middleMiocene)

Rhyodacite dikes(middle Miocene)

COLORADORIVER DEPOSITS

Beachsediments (recent)

Quartzite (Paleoproterozoic?)

Rhyolite dikes (middleMiocene)

Anthropogenic deposits (recent)

Rhyolitic tuffaceousrocks(middle Miocene)

Piedmont alluvium(Late Pleistocene)

Piedmont alluvium(middle Pleistocene)

Piedmont alluvium,undivided (Holocene)

Graniticdike (early to middleMiocene)

Conglomerateand Sandstone (middleto lateMiocene)

Eoliansand (recent tolate Pleistocene)

PIEDMONTALLUVIUM AND HILLSLOPE DEPOSITS

Eoliandeposits of reworkedTcb? (Pliocene)

Piedmont alluvium(late tomiddle Holocene)

Talus andcolluvium (Pleistocene to Pliocene)

Piedmont alluvium(late tomiddle Pleistocene)

Third Colorado River terrace(late Pleistocene)

Piedmont alluvium(Middle toearly(?) Holocene)

Porphyriticgranodioritedikes (middleMiocene)

Second Colorado River terrace(latePleistocene)

Piedmont alluvium(early Pleistoceneto Pliocene(?))

Piedmont alluvium(early Holoceneto latePleistocene)

Mud-dominatedfacies of theChemehuevi beds(late Pleistocene)

ColoradoRiver gravels,undivided (late tomiddle Pleistocene)

Sand dominatedfacies of theChemehuevibeds (late Pleistocene)

Fourth (lowest lying) Colorado River terrace(late Pleistocene)

ColoradoRiver terracesediments,undivided (Late Pleistocene)

Fanglomerate of theEldorado Mountains(Pliocene tolate Miocene)

ColoradoRiver sediments,undivided (late tomiddle (?) Pleistocene)

First (oldest andhighest) ColoradoRiver terrace (latePleistocene)

ColoradoRiver sediments.The 'sediments of Cottonwood Cove' (late (?) Pleistocene)

Upper Searchlight pluton,quartz monzonite togranodiorite (earlyto middleMiocene)

Piedmont alluvium,undivided. MixedQai and Qay (Holocene toPleistocene)

Piedmont alluvium,undivided. MixedQay and Qai (Holocene toPleistocene)

ColoradoRiver sediments,undivided (earlyPleistocene to latePliocene(?))

Dacite-andesitelavas (middleMiocene) Possibly correlativewithMount DavisVolcanics.

Valley fillsediments.Lost Cabinbeds of Houseet al.(2008)? (late Miocene)

ColoradoRiver sediments,the 'lakeside beds' (middle toearly(?) Pleistocene)

ColoradoRiver sediments.Chemehuevi beds of Houseet al.(2005) (latePleistocene)

ColoradoRiver sediments.Bullheadalluvium of Houseand others(2005, 2008) (earlyPliocene)

Piedmont alluviumwith reworkedColorado River sediments(early Pleistoceneto late Pliocene(?))

Upper Searchlight pluton,porphyritic-phaneritic phase,quartz monzonite to granodiorite (early to middle Miocene)

Basalticandesite lavas (middleMiocene) Prob.correlates withmafic lavas of Mount DavisVolcanics (Faulds,1995).

Breccia of volcanic rock(middle Miocene) Prob.correlates with brecciaunits in Mount Davis Volcanics (Faulds,1995).

Piedmont Alluviumand Hillslope

Other DepositsColoradoRiver Deposits

Miocene IntrusionsMiocene Strata

Proterozoic(?)

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Vein Showingdip.

Strike anddipof joints

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Tephra SampleLocality

CWAJB02-1

Contact Solid where certain and locationaccurate, long-dashed whereapproximate, short-dashedwhere inferred.

See accompanying text for fullunit descriptionsandreferences.

Holocene

Pleistocene

Pliocene

Miocene

Proterozoic

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Scale 1:24,000

CONTOURINTERVAL40 FEET

kilometer0 0.5 1

mile0 0.5 1

feet0 1000 2000 3000 4000 5000

Field workdonein 2006-2008Supportedby theU.S.Geological Survey STATEMAPProgram(Agreement No.07-HQ-AG-0064)

DRAFTPreliminarygeologic mapHas notundergoneofficeorfieldreviewWill berevisedbefore publication

Editedby JordanHastingsCompilationin ESRIArcGISv9.2 (ArcGeology v1.2) by P.Kyle House,

andinCardinalSystemsVrMappingSoftwareby NickHinz,andJamesE.Faulds

Cartography andlayout inESRI ArcGISv9.2 by Matthew RichardsonandJennifer Mauldin

FirstEdition, October 2008Printedby NevadaBureauof Mines andGeology

This map was printed on an electronic plotter directly fromdigitalfiles. Dimensional calibrationmayvary betweenelectronic plotters andXandY directionson the sameplotter,and paper may changesize; therefore, scaleand proportions may not beexact oncopies ofthis map.

Forsale by:NevadaBureau ofMines andGeologyUniversityofNevada,Reno/ 178Reno,Nevada 89557-0178ph.(775) 784-6691,ext.2www.nbmg.unr.edu;nbmgsales@unr.edu

2027

Projection:Universal Transverse Mercator,Zone 11,North American Datum 1927 (m)

Base map:U.S. Geological Survey SpiritMtn. NW

7.5' quadrangle (1959), Polyconic projection GeologicmappinginUTMisno longercoincident withthis base.

11445'00"W

11445'00"W

3530'00"N

3527'30"N