Nbmgof085map

NEVADA BUREAU OF MINES AND GEOLOGY

114°45'00"W

05

35°30'0"N

Qai1

Qay

Tcb?

QTtc Trt

QTtc

Qai

Qai1

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Qai1

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28

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27

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35°27'30"N26

Qai Qai

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Qai1 Qai Qao Qao

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25 Qao Qao Qai Qao

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Qx Qcw

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Qch

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Qao

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Qai Qai

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14

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35°30'00"N PIEDMONT ALLUVIUM AND HILLSLOPE DEPOSITS

Qay1 Qay+i Qay1 Qay1 Qai3 Qai3 Qay1 Qai3 Qai3 Qay1 Qay1 Qai3 Qay1 Qay1 Qay1 Qai3 Qai3 Qai3 Qai3 Qai3 Qay1 Qai3 Qai3 Qay1 Qay1 Qai3 Qay1 Qai3 Qay1 Qai3 Qay1 Qcts1 Qay1 Qay+i Qay1 Qay1 Qai3 Qai3 Qay1 39 30 Qay1 Qcts1 Qay1 Qay1 Qay1 Qay+i Qai3 Qai3 Qay1 Qai3 Qai3 Qai3 Qai3 Qai3 Qai3 Qay1 Qai+y Qcts1 Qai3 Qai3 Qai3 Qay1 Qai3 Qai3 Qay Qay1 Qay 1 Qcts1 Qay1 Qay1 Qay1 Qay1 Qcts1 Qai3 Qay1 Qai3 Qay1 Qay1 Qai3 Qay1 Qai3 Qay1 Qcts1 Qay1 Qcts2 Qai3 Qcts1 Qay1 Qai3 Qai3 Qai3 29 Qcts1 Qay1 Qay1 Qai3 Qay1 Qai3 Qai3 Qai3 Qay1 Qcts1 Qai3 Qay 1 Qai3 Qcts1Qay1 Qay1 Qay1 Qai3 Qay 1 Qai3 Qai3 Qai3 Qay1 Qai3 Qay1 Qay1Qai3 Qai3 Qay1 Qay1 Qai3 Qay1 Qai 3 Qai3 Qai3 Qay1 Qai3 Qai3 Qay1 Qai3 Qay1 Qai3 Qai3 Qay1 Qai3 Qai3 Qay2 Qai3 Qay1 Qay1 Qai3 Qai3 Qai3 Qai3 Qcts2 Qay1 28 Qay1 Qay1 Qai3 Qai3 Qay1 Qai3 Qai3 Qay1 Qai3 Qai3 Qai3 Qai3 Qai3 Qcts3 Qai3 Qai3 Qai3 Qai3 Qai3 Qai3 Qai3 Qai3 Qai3 Qai3 Qcts4 Qai3 Qai3 Qai3 Qai3 Qai3 Qai3 Qai3 Qby Qai 3 Qai3 Qai3 Qai327 Qcts Qai3 Qai3 Qai3 Qai3

Qay Qay

Qay

Qay

Qai3 Qay

Qai1

Qay

Qai3

Qai3

Qai3

Qai3 Qai3

Qay

Piedmont alluvium (Middle to early(?) Holocene)

Qai3

Piedmont alluvium (early Holocene to late Pleistocene)

Qai2

Piedmont alluvium (Late Pleistocene)

Qai1

Piedmont alluvium (late to middle Pleistocene)

Qay+i

Piedmont alluvium, undivided. Mixed Qay and Qai (Holocene to Pleistocene)

Qai+y

Piedmont alluvium, undivided. Mixed Qai and Qay (Holocene to Pleistocene)

Qao

Piedmont alluvium (middle Pleistocene)

QTa

Piedmont alluvium (early Pleistocene to Pliocene(?))

QTac

Piedmont alluvium with reworked Colorado River sediments (early Pleistocene to late Pliocene(?)) Fanglomerate of the Eldorado Mountains (Pliocene to late Miocene) Talus and colluvium (Pleistocene to Pliocene)

Qcts

Colorado River terrace sediments, undivided (Late Pleistocene)

Qcts1

First (oldest and highest) Colorado River terrace (late Pleistocene)

Qcts2

Second Colorado River terrace (late Pleistocene)

Qcts3

Third Colorado River terrace (late Pleistocene)

Qcts4

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

Qcs

Colorado River sediments, undivided (late to middle (?) Pleistocene)

Qcg

Colorado River gravels, undivided (late to middle Pleistocene)

Qch

Colorado River sediments. Chemehuevi beds of House et al. (2005) (late Pleistocene)

Qchs

Sand dominated facies of the Chemehuevi beds (late Pleistocene)

Qchm

Mud-dominated facies of the Chemehuevi beds (late Pleistocene)

Qcw

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

QTcl

Colorado River sediments, the 'lakeside beds' (middle to early(?) Pleistocene)

QTc

Colorado River sediments, undivided (early Pleistocene to late Pliocene(?))

Tcb

Colorado River sediments. Bullhead alluvium of House and others (2005, 2008) (early Pliocene)

Tcb?

Eolian deposits of reworked Tcb? (Pliocene) Valley fill sediments. Lost Cabin beds of House et al. (2008)? (late Miocene)

Qby

Beach sediments (recent)

Qe

Eolian sand (recent to late Pleistocene)

Qx

Anthropogenic deposits (recent) MIOCENE STRATA

Tc

Qby

25

Conglomerate and Sandstone (middle to late Miocene)

Tdbv

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

Tdm

Basaltic andesite lavas (middle Miocene) Prob. correlates with mafic lavas of Mount Davis Volcanics (Faulds, 1995).

Trt

Rhyolitic tuffaceous rocks (middle Miocene)

Tda

Dacite-andesite lavas (middle Miocene) Possibly correlative with Mount Davis Volcanics. MIOCENE INTRUSIONS

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Qai3

Qai3 Qai3 Qai3 Qay1 Qay1

Qay1

OTHER UNITS

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Qai3

Piedmont alluvium (late to middle Holocene)

Tls

Qay

Qai3

Qay2

COLORADO RIVER DEPOSITS

Qai3 26 Qai3 Qai3 Qai3 Qai3

Qcw

Piedmont alluvium, undivided (Holocene)

QTtc

Qai35°27'30"N 3 Qai3 Qai3 Qai3

Qai1

Qay

Tfe

Qai3

Qai3

QTc

PRELIMINARY GEOLOGIC MAP OF THE NORTH HALF OF THE SPIRIT MTN. NW QUADRANGLE, CLARK COUNTY, NEVADA AND MOHAVE COUNTY, ARIZONA

114°37'30"W

15

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Qay1 Qay1 Qay1 Qay1 Qai3 Qay 1 Qay 1 Qay1 Qai3 Qay1 Qai3 Qay1 Qai3 Qai3 Qai3 Qay1 Qay1 Qai3 Qai3 Qai3

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13

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Tgdi Qai

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Xq

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Qai+y Qay1 Qao Qai Qay1 Qao Qay1 Qao Qai Qai Qai Qai Qao Qao Qao Qao Qai Qao Qao Qao Qao Qao Qao Qao Qao Qao Qao Qai+y Qai Qao Qao Qai Qai Qai+y Qay1 Qai Qai Qai Qao Qai Qai Qay1 Qai

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Tcb

Qby Tsu Tsu Qby Qai1 Tsu Qai1 Qby Qcg Qai1 Qai1 Qai1 Qcg QTc Tsu Tsu Qai1 Qai1 Qx Qai1 Qcg Qby Qay2 Qai1 Qai1 Qai1 Qcg Tsu Qchs Qcg Qai Qai 1 Tc 1 Qai 1 Qai1 Qai1 Qcg Qay1 Tgdi Tgdi Qai1 Qai1 Qcg Tsu Qai1 Tsu Qai Qai1 Qai1 Qay1 Qchs Tgdi TgdiTsu Qcg Qcg Qay Tc Qchm Qay1 Tsu Tgdi Qcg Tls Tgdi Tsu Qchm Tcb Tc Qay1 Qcg Tsu Tsu Tsuf QTc Qay1 Tls Tri Qai Qai Tri TsuQai Tsu Qcg Qay2 Qcg Tsuf Trdi Tsu Qai Tdbv Tsu Tsu Trdi Qai Qcg Qai Qay2 Qch Qai Qai Qai1 Qcg Qai Tdbv Qai Tcb Qby Qch Tc Qay1 Qai1 Qcw Qai 1 Qai Qch Qai1 Qcw Tls Qai1 Qai Qay2 Qby Qai Qay2 Qchm Qai Qai Qai Qai Qai Qai Qai Qcw Qai Qai Qai Qai Qchs Qai Qby Qcw Qai Qai Qai Qai Qcg Qai1 Qcg Qai Qcw Qai Qai Qcw Qai Qai Qcg QTc Qcg Qai Qai Qai Qai Qch Qcg Qai Qai Qch Qchm Qai Qai Qai Qcw Qcg Qai Qai 1 Qai Qby Qai Qai Qai Qai Qai Qai Qai Qai Qai Qai Qcg Qay Qai Qay Qai Qch Qcw Qcw Qby Qai1 Qcw Qcg Qai Qay Qcw Qcw

Qai1

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Qai Qai

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Qay Tcb

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Qai Qai Qai1

Qao Qai Qao

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Qao Qao Qai Qao Qao Qao Qao

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Tcb Qby

Tcb

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Qai Qai Qai+y

Tcb

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Qay+i Qay+i Qay+i Qay+iQay+i Qai+y

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QTac QTac

Tcb Qcts1 Qcts1 Qai1 Qby Qe

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114°40'0"W

11

10

7

Tcb

Qai3 Tcb

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09

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QTtc Tda QTtc Tda Qay2

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29

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Tcb

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QTa Tcb?

QTa

Tda QTtc

Tda

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Tcb

Tfe

CWAJB02-1

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3930

114°42'30"W 08

07

06

Qai1

Tfe Tfe

Qay

OPEN-FILE REPORT 08-5

Prepared as part of the STATEMAP component of the National Cooperative Geologic Mapping Program in cooperation with the U.S. Geological Survey

Qai3

24

Qay Qai3

Tcv

Calcite veins (middle Miocene)

Trdi

Rhyodacite dikes (middle Miocene)

Tri

Rhyolite dikes (middle Miocene)

Tgdi

Porphyritic granodiorite dikes (middle Miocene)

Tdi

Dacite dikes (middle Miocene)

Tgi

Granitic dike (early to middle Miocene)

Tsuf

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

Tsu

Upper Searchlight pluton, quartz monzonite to granodiorite (early to middle Miocene) PROTEROZOIC (?)

Xq

Quartzite (Paleoproterozoic?)

23 23 See accompanying text for full unit descriptions and references.

22 Piedmont Alluvium and Hillslope

Holocene

22

Qay

35°25'0"N

35°25'0"N

Qay2 Qay1

Colorado River Deposits

Qby

Qay+i

Qcts

Qai2

Qcts2 Qcts1

Qcg Qai1

Qch

Qai+y

3920

Pliocene

QTa

QTac

QTtc

Symbology (per FGDC-STD-013-2006)

Qchm

Contact Solid where certain and location accurate, longdashed where approximate, short-dashed where inferred. ? Normal fault Solid where certain and location accurate, long-dashed where approximate, dotted where concealed; queried if identity or existence uncertain. Ball on downthrown side.

QTc

Tfe

Tcb

Miocene Strata

19

Qchs

Qcw

Qao

39 20

Qx

Qcts3

Qai

Pleistocene

21

Qe

Qcts4

Qai3

21

Other Deposits

?

Mainly strike-slip fault Solid where certain and location accurate, long-dashed where approximate, dotted where concealed; queried if identity or existence uncertain. Arrows show relative motion.

Miocene Intrusions

Tc

19

Tdbv

Vein Showing dip.

Tdm Trt

Tda

Tcv

Trdi

Tephra Sample Locality

Tri

Miocene

18

Tephra Bed

CWAJB02-1

Tdi

Tgdi Tgi

18

Strike and dip of bedding Tsuf

15

Tsu

Inclined

Strike and dip of joints

39

17 000m.N

Proterozoic

15

35°22'30"N 114°45'00"W

705000m.E

06

07

08 114°42'30"W

09

710

11

12 114°40'0"W

13

PRELIMINARY GEOLOGIC MAP OF THE NORTH HALF OF THE SPIRIT MTN. NW QUADRANGLE, CLARK COUNTY, NEVADA AND MOHAVE COUNTY, ARIZONA P. Kyle House and James E. Faulds 2008

14

15

Inclined

Proterozoic (?) Xq

35°22'30"N

114°37'30"W

Adjoining 7.5' quadrangle names

1 2 3 4 5 6 7 8 9

1

2

3

4

5

6

7

8

9

Ireteba Peaks Mount Davis Mount Perkins Fourth of July Mountain Spirit Mtn. NW Spirit Mtn. NE Searchlight SE Spirit Mtn. Spirit Mtn. SE

Scale 1:24,000 0

0.5

0 0

1 kilometer

0.5 1000

2000

Field work done in 2006-2008 Supported by the U.S. Geological Survey STATEMAP Program (Agreement No. 07-HQ-AG-0064)

3000

1 4000

5000

mile feet

CONTOUR INTERVAL 40 FEET Projection: Universal Transverse Mercator, Zone 11, North American Datum 1927 (m) Base map: U.S. Geological Survey Spirit Mtn. NW 7.5' quadrangle (1959), Polyconic projection

Geologic mapping in UTM is no longer coincident with this base.

DRAFT Preliminary geologic map Has not undergone office or field review Will be revised before publication Edited by Jordan Hastings Compilation in ESRI ArcGIS v9.2 (ArcGeology v1.2) by P. Kyle House, and in Cardinal Systems Vr Mapping Software by Nick Hinz, and James E. Faulds Cartography and layout in ESRI ArcGIS v9.2 by Matthew Richardson and Jennifer Mauldin First Edition, October 2008 Printed by Nevada Bureau of Mines and Geology This map was printed on an electronic plotter directly from digital files. Dimensional calibration may vary between electronic plotters and X and Y directions on the same plotter, and paper may change size; therefore, scale and proportions may not be exact on copies of this map.

For sale by: Nevada Bureau of Mines and Geology University of Nevada, Reno / 178 Reno, Nevada 89557-0178 ph. (775) 784-6691, ext. 2 www.nbmg.unr.edu; [email protected]

2027