Nbmg Of0616

NEVADA BUREAU OF MINES AND GEOLOGY

Tcs

Qai

Tlb

Tfha

25

Qay2

40 10

20

Qay2

Tfba

Qai

Qay2

35

Qai

Tfa

25 35

55

Qau

25

30

20

20

25

Thai

Kqd

35

Tva

30

Jm

Tva

20

Tva

Tfd

Tbhi

Thai

Thai

Tbhi 70

Tva

85

45

30

Thai

65

35

Tfa

50 40

Qay

Thai

30

30

15

Qay

80

Qay2

Qay2

Qay

Tva

Qay1

Qay1

Tfsa

Tva

Tod

85

15

Tva

Tvpa

Qai 80

40

20

25

Tbhi

45

Tvkb

Tfd

70 80

Qau

Qau

65

20

Tvba 20

Tfma

35

25

20

Tvbd

Tvba Tvkp 30 35

Qai

Tvba

Tvbd Qau

Tvba

Tvka 35 20

Tvkbd

20 30

45

Tvba

20

10

25

5

35

35

Qay

30

Tspa

Tspa

Qau

Tsdm

Tsdu

Tspa

Tsa

Qay

20

25

30

Qay1

Qay2

Qfl

Qfl

Qay2

Qay1 Qay1

Qay1

Qw

Qw

Qw

Qes

Qes

Qes

Qed

Qay

Qfl

Qay3

Qay3

Qay2

Qry4

Qry1

Older Carson River alluvial deposits (middle to early? Holocene)

Qc

Holocene and Pleistocene colluvium

Qls

Landslide deposits

Qtb

Basalt talus

Qry2

Qfl

Fluvio-lacustrine deposits (late to middle Pleistocene)

Lousetown Basalt

Tcs

Sedimentary rocks of the Chalk Hills

Tod

Dacite of Occidental Quarry

Qry1

Qry1

Piedmont Alluvium Qay

Qry2

Qry 1

Qfl

Qay3

Qry1

Qfl

Qfl Qay

Qry2 Qfl

Tspa

Pyroxene andesite flows

Tsa

Silver City andesite flows, undivided

Tsd

Undivided debris flows Middle debris flow unit

Undivided debris flows

Tsdl Tsha Tst

Andesites of Flowery Peak, undivided

Tfba

Andesites of Flowery Peak, undivided

Tfha

Hornblende andesite

Tfsa

Biotite-hornblende andesite of Sugarloaf

Tfra

Biotite-hornblende-pyroxene andesite of Rocky Peak

Tfma

Biotite-hornblende-pyroxene andesite of Mount Grosh

Hornblende andesite intrusive rocks

Ts

Hornblende andesite intrusive rocks

Tva

Virginia City andesites, undivided

Tvka

Andesites of the Kate Peak series

Tvkp

Olivine-pyroxene andesite

Hornblende andesite flow rock Santiago Canyon Tuff

OLIGOCENE ROCKS Tgm

Guild Mine Member, Mickey Pass Tuff(?)

PRE-TERTIARY ROCKS Klg

Leucogranitic rock

Kgd

Hornblende-biotite quartz diorite to granodiorite

Jm

Metamorphic rocks

References

Debris flows with biotite-hornblende andesite clasts

Thai

Qry3

Qay3 Qry

Castor, S.B., Garside, L.J., Henry, C.D., Hudson, D.M., and McIntosh, W,C., 2005, Epithermal mineralization and intermediate volcanism in the Virginia City area, Nevada, in Rhoden, H.N., Steininger, R.C., and Vikre, P.G. (editors), Symposium 2005, Window to the World: Geological Society of Nevada Symposium Proceedings, p. 125-134. Hudson, D.M., 2003, Epithermal alteration and mineralization in the Comstock District, Nevada: Economic Geology, v. 98, p. 367-385. Hudson, D.M., Castor, S.B., Garside, L.J., and Henry, C.D., 2003, Preliminary geologic map of the Virginia City Quadrangle, Nevada: Nevada Bureau of Mines and Geology Open-File Report 03-15. Morrison, R.B., 1964, Lake Lahontan: Geology of the southern Carson Desert, Nevada: U.S. Geological Survey Professional Paper 401, 156 p. Morrison, R.B., 1991, Quaternary stratigraphic, hydrologic, and climatic history of the Great Basin, with emphasis on Lakes Lahontan, Bonneville, and Tecopa, in Morrison, R.B., ed., Quaternary nonglacial geology: Conterminous U.S.: Geological Society of America, Geology of North America, v. K-2, p. 26-36.

Tvkb

Biotite-hornblende andesite flows

Tvkd

Andesite debris flows

Schwartz, K.M., and Faulds, J.E., 2002, Preliminary geologic map of the Chalk Hills Quadrangle, Storey County, Nevada: Nevada Bureau of Mines and Geology Open-File Report 04-11.

Qay2 Qao

Qai

Qai

Qao

?

Qao Qao

Ql

Qfl

Qtb

Qc

?

?

Qls

Qnr

Qnb

Qnw

Qnt

Qns

QTs Contact Dashed where approximately located, short dashes indicate internal contact.

Tfa

? Fault Dashed where approximately located, queried where uncertain, dotted where concealed.

Intrusive Rocks

Tfra

Tfma

Lineament

Tfba

Tfha

Quartz vein or ledge, some showing dip.

Tfsa

Clay vein or clay along fault

Tfd

a

Thai

Alunite vein or ledge solid, dashed where approximately located. ? Lacustrine scarp/shoreline, queried where uncertain.

Tvkp Tvka Tva

Tvkbd

Strike and dip of beds

Tvkb

30

Tvkd Tvba

Tvbd

Tvpa

Qai

Qao

Tsa

Inclined

Tvs 30

Tsdm

Inclined

Vertical

Strike and plunge of columnar joints

Tsdu Tsd

Tst

Horizontal

Strike and dip of foliation in igneous rocks

Tspa

Tsha

Inclined

Strike and dip of joints

Tfsa

PRE TERTIARY

Qt

Rocks of the Naturalite Quarry

Tsbd

50

Tsdl

Tgm Kgd Jm

Field work 2002-2005 Geologic mapping was supported by the U.S. Geological Survey STATEMAP Program (Agreement No. 04-HQ-AG-0032 and 05-HQ-AG-0014)

Scale 1:24,000 Adjoining 7.5' quadrangle names 1

2

4

Stephen B. Castor, P. Kyle House, and Donald M. Hudson 2006

Qx

Ts

Qai

PRELIMINARY GEOLOGIC MAP OF THE FLOWERY PEAK QUADRANGLE, STOREY AND LYON COUNTIES, NEVADA

Qed

Anthropogenic Deposits

Tbhi

Qai

Qes

Qes

Other Deposits ? ?

Tod

Qfl

Qai

Qsp

QTa

Qed

Qay

Qry 1

Qry4

Qry2

Eolian Deposits

Lacustrine, Spring, and Related Deposits

Qry1

Tcs

Tsa

Qed

Qry1

Qay2

Tlb

Qai

Qry1

Qai

Qry1

Upper debris flow unit

Biotite-hornblende intrusive rocks

Carson River Alluvium

Qao

Qfl

Qes

Qry4

Tsdu

Tsdb

Tvkbd Biotite-bearing debris flows

Qay1

Qry1 Qry 1

Fine-grained andesite

Qw

Tsa

Qry 1

Tsfa

Tsdm

Tfa

Spring deposits (latest Holocene to late Pleistocene)

Qry1

Qry 1

Tlb

Rocks of the Virginia City Magmatic Suite

Undivided lacustrine deposits (latest to middle Pleistocene)

Qry1 Qfl Qfl

Qry3

Qfl

Spring deposits

Tfd

Ql

Qry3

Qry3

Qry3

Qay

Qry 1

Qry2

Intermediate-age mud, sand, and gravel deposits of the Carson River (late to middle? Holocene)

Qry3

Qry1

Qry 1

Qry2

Qry1

Qry3

Young mud, sand, and gravel deposits of the Carson River (latest to late Holocene)

Qry 3

Qry 1 Qry 1

QTs

Qai

Qry 3

Qay

Qry2

Qry2

Qry3

Pleistocene to Pliocene alluvium

Rocks of the Flowery Peak Magmatic Suite

Active channel and bars of the Carson River (latest Holocene)

Qry3

Qfl

Qry2

Qry

Qed

Qry

Qay2

Qay

Qes

Qfl

Qry1

Qfl

Qfl

Qes

Qfl

Qes

Qry1

Qry3

Qay Qay3

QTa

Tbhi

Carson River alluvial deposits, undivided (Holocene)

Qx

Qay2

Qay1

Qw

Qay

Qed

Qes

Qes

Qry 1

Qay

Qay2

Qes

Tsdm 25

Qes

Qay2

Qay1

Qay3

Qed

Qfl

Qry1

Qry1

Rocks of the Silver City Magmatic Suite

Qfl

Qes

Qfl

Qay1

Qai

Qry2

Qay

Qay2

Qay2

Qry1

Tuff ring deposits

Thompson, G.A., 1956, Geology of the Virginia City Quadrangle, Nevada: U.S. Geological Survey Bulletin 1042-C, 75 p., 1:52,500 map.

Qfl

Qay1

Qay1

Qed Qay3

Qnt

Qed

Qay2

Qay1

Qry1

Qes

Qay1

Tva

Qes

Qay3

Qry3

Qfl

Tsdl

Ql

30

Qay1

Qes

Qay

Qc

Tsbd

Qx

Qry1

Qes

Qay2

Qai

Qw

Qw

Qes

Qes

Qau

QTa

Tsdm

Qx

Qw

Qes

Old alluvium (middle to early Pleistocene)

Oligocene

Qay3

35

Tsbd

Tsha

Qay

Qay

Qay

Qay1

Qay

Qay

QTa

30

Tsdm

Qao

Qay

QTa

35

Qx

Pyroxene andesite flows

Silberman, M.L., White, D.E., and Keith, T.E.C., 1979, Duration of hydrothermal activity as Steamboat Springs, Nevada, from ages of spatially associated volcanic rocks. U.S. Geological Survey Professional Paper 458-D, 14 p.

Qfl

Qry2

Qay3

30

QTa

Qx

Tvs

Intrusive Rocks

Qao

Qsp

Qay

Qay1

Qay2

Qes

Qes

Qay3

Tsdu

Qay Tspa

Qay1

Qai

Qao

QTa

Tspa

Qai

Qai

Tsdu

QTa

Qay1

Tspa

Tvka

Thai

Qc

Qay1

Qay1

Qai

QTa

QTa

Qay

Qay

Qai

Tvbd

12

18

Tsha Qc Tsdu Qay

Qay3

Rhyolite breccia

Other Late Cenozoic Units

Qay2

Qx

Qx

Qt

QTa

Qay

Qay1

Qai

Tsha

Qc

Tsdu Tspa Tvba

Tspa

Qay

Qay Tvkd

Qai

Qau

Tvbd Tvkd

Tvba Tspa

Tsdu

QTa

Tsdu

Qai

Tsha

Qau

QTa Qau

30 30

Tspa

Qay

20

Tvba

17

40

Qay

Tvbd

35 12

Qai

Tvba

Qai

10

Qc

Qay1

Qay2

Qay

Qai

Qx Qt

Qay1

Tbhi Tsdu

Qau QTa

Qai

Qai

60

70

Qai

Tvba

Qai

40

Qau

Tvbd

Thai

Qau

QTs

Ql

Qnb

Qay3

Qay2

Qes

Qay

Qay

Tvba

10

30

Tvba

QTs

Tbhi

20

Qao

QTa

Qay

Thai

Qay1

Qw

QTa

45

Pyroxene andesite flows

Qay2

Qay3

Thai

Thai

Thai

40

QTls

QTa

Qay1

Qay1

Qao

Qay3

25

Qay3

Tbhi

Qay

Tvba

20 40

30

Young inactive alluvium (middle? Holocene to latest Pleistocene)

Fluvial and Lacustrine Deposits of Lake Lahontan

Qay2

Qao Tva

Qau

Tvpa

Qai

Qao

Qay2

Tva

30

Qai Qai

Tvbd

30

20

Thai

Qay

Qay1

Tva

Tvpa

Tvba

20

QTa

Qay1

Hillslope and Mass-Wasting Deposits

Qai

Qao

Qao

70

50

QTls

40

Tvka

Qai

Tbhi

Tvbd

40

60

Tvba

70

Qao

Qay2

Qay1

Glassy rhyolite

QTa

25

Tvba

Qai

Tvba

Tvba

45

5

Tvka

Tvpa 30

25

35

Qay

Tvba

Tbhi

35

Qay2

QTa

Qao

30

Qai

Qao

Young active alluvium, (latest to middle Holocene)

Intermediate-age alluvium (late to middle? Pleistocene)

55

Tfba

Qai

Qai

Qai

Qay2

Qai

Qay

Qay1 Qay1

Youngest active alluvium (latest Holocene)

Qry4

Qai

20

Tva

15

30

70 25

30

Tvkb

Tfd

30

Qao

Qay3

Qry

Qai

Qay1

Qai

Qnr

Undivided young piedmont alluvium

Qw

Qai Tfba 5

Tfba

Qay1

Qay2

Undivided piedmont alluvium

Alluvial and eolian deposits of the Wyemaha Alloformation (Morrison, 1964, 1991) (late Pleistocene)

Qay3

45

Qao

Qai

Biotite-hornblende andesite debris flows

MIOCENE ROCKS

Carson River Alluvial Deposits

Qai

QTa

Qay1

Qc

Qay3

Tvba

Tvpa

Tbhi

Tod

80

Qt

30

35

35

Tsa

Qai

Qai

70

Tva

15

20

40

Qai

Tst

30

Tbhi

Tva

Tst Qay

Tva

Qau

20

Qt

Tbhi

10

80

45

QTa

Tbhi

50

Tfsa

40

Tsd

Tfd

Qai

Tva

QTa

Qay

Tvpa

Qay3

Qt

Qau

Tsa

Tbhi

Tvba

30

80

30

40

30

Qay

Tfsa

Tva

Tvkb

70

Tsa

25

Tfd

Qns

Qns

Qay1

25

75

80

QTa

Qay

25

20

Tsfa

Qao

40

QTa

15

Qay2

Tvs

Tfra

Tfra

Qao

Qay

Qay

25 35

20

Qns

Qao

Tva

Qay3

25

50

QlsKg

30

Qt

Qay

Tbhi

Qau

40

50

Qau

Qay3

Qay

Tva

Qt Qay1

Tbhi

20

Tbhi

60

Qay Tbhi

Qt

50

60

Qt

Tva

Tbhi

Tva

Qai

Tfba

Qt

Qai

Tgm

Kgd

75

Qnb

10

Qao

Qay2

Thai

Qay 15

75

40

Qns

35

60

Qai

Qai

45

75

Tva

50

Qnt

Tfba

Qai

QTa

Qt

55

Qau

60

Kg

70

85

Tbhi

Tbhi

Qay

Tva

Tbhi

Tfra

Tfra

75

70

60

Tvs

Tbhi

65 70

40

Tfa Qay3

60

80

45

70

Tfra

55

85

25

Qau

55

30

Tvs

45

65

Tbhi

80

35

Tbhi

Thai Tbhi

15

80

15

Tva

Tbhi

Thai

Qns Tfd

10

50

Tfra

80

Thai

30 60

Qay

Jms

80 55

Tfd

Qao

50

Qnr

Qao

Tsa

Qay3 Qns

Tvbd

Eolian sand sheet

Qau

Biotite-hornblende andesite flows

Welded rhyolite airfall

35

Tsa

Qay

Tsa

30

Qsp

30

Tbhi

Jm

70

Qao

Qai

80

75

Qns

Eolian Dunes

Tvba

Qnw

QUATERNARY AND TERTIARY DEPOSITS

Piedmont Alluvial Deposits

40

50

Qed Qes

Qai

Tsd

Tsa

Qao

Qay3

Qay1

Qnt

15

70

70

Qns Tsa

80

Qns

35

Qai

5

Qai

25

Ts

Qao

Qao Qai

10

10

Qnw

20

Tsa

Tbhi

Klg

80

Tsd

Tsa

Qai

Qay2

Klg

20

40

25

Qc

Qay

35

Qai

Qay1

Tsa 60

45

Qns

Kqd

Tbhi

35

50

Klg

Qnr

50

Qt

Qai

Qc

Thai

45

25

Qau

Tsd

Tsa

Qns

Klg

Klg

45

20

35

Qai Tsa

50

Tsa

Tfba

Qay3

Tsd

Qay

Tfd

Ts

32

50

Tss Qay

Tsa

Tsfa

Qao

QTa

Tfba

QTa

Qai

35

Qay

Klg

Klg

20

Tva

Thai

Qau

Klg

35

10

15

QTa

50

Qau

Tsa

30

Thai

Tfd Tfd

40

15

Tfd

30

Qsp

Qay

55

40

10

Qns

Tfba

Qai

Tva

Qsp

Qsp

30 20

Tsa

Qai

35

Tfha

Tfd

20

10

Kgd

Kgd 20

Tsa

Qai Tsa

Tsa

Tfha

Tfd

25

50

Qsp

Tva

Tfha

50

Tfba

Tfd

Tfd

75

60

20

Tfba

Tfa

Tfa

25

Tfa

25

35

45

Qay Kgd

Qai

Tfa

20

60

25

25

35

20

45

25

30

30

Tfra

20

25

Tfd

Qai

Tsd

Jm

30

Tfba

Qay

Tfba

Tsd

Eolian Deposits

70

35

Qai

60

65

55

Extensively disturbed areas (e.g., gravel pits and borrow pits)

Qx

Qau

Qai

Qao

Qay

Qao Qay

QTa Tsfa

Qao

Tfba

Tfba

30

30

40

40

30

Tfba

45

35

45

Tfa

40

Qau

Qau

Tsa

20

Qau

Tfba

Qay2

Qay

Qau

35

35

Tfa

Qau

25

Tfba

30

Tfa

Tfra

Tfa 30

30

Tfba

40

70

40

30

25

15

75

35

Tsa

25

Mine waste and mill tailings (latest Holocene)

Qt 80

45

Tsa

30

15

Qay2

20

Tfba

Qai

Qai

Deposits of the Naturalite Dome Area

Anthropogenic Deposits

40

15

25

Tfd

Jmv

40 20

20

Tfd

35

25

20

Qau

15

Qau

Tgm

Jmv

40

Qay3 60

45

10

40

Tsa

Tgm

Tgm

Tfra

Tfd

Qai

15

Qau

45

70

50

25

Tfd

Tfa

30

45

30

45

30

20

25

Tfba

30

Tfa

30

55

Qai

20 25

Tcs

Tfra

Tfa

Qau

20

Qay2

40

20

20

Tcs

Tlb

Tcs

QUATERNARY DEPOSITS

Tfba

Flowery Peak Suite

25

Tcs

55

Virginia City Suite

20

15

15

35

30

Silver City Suite

Tcs

25

30

25

Holocene

30

Qay3

Qai

30

Qay3

Pleistocene

Tcs

Qtb

Qai

Tcs

Pliocene

10

Miocene

20

QUATERNARY

Tcs

Tlb

Qtb

Qau

Tlb

TERTIARY

Tlb

Tfba

Tfba

OPEN-FILE REPORT 06-16 PRELIMINARY GEOLOGIC MAP OF THE FLOWERY PEAK QUADRANGLE, STOREY AND LYON COUNTIES, NEVADA

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

6

3 5

7

8

1 Steamboat 2 Chalk Hills 3 Martin Canyon 4 Virginia City 5 Misfits Flat 6 New Empire 7 Dayton 8 Como

0

0.5

0 0

0.5 1000

DRAFT

1 kilometer

2000

1 mile 3000

4000

5000 feet

CONTOUR INTERVAL 40 FEET Base map: U.S. Geological Survey Flowery Peak 7.5' Quadrangle, 1985 Universal Transverse Mercator projection, 1927 North American Datum

Preliminary geologic map. Has not undergone office or field review. Will be revised before publication.

First Edition. Printed by Nevada Bureau of Mines and Geology Digital geologic compilation by P. Kyle House, Stephen B. Castor, and Jennifer Mauldin Cartography by Jennifer Mauldin Nevada Bureau of Mines and Geology University of Nevada, Mail Stop 178 Reno, Nevada 89557-0088 (775)784-6691, ext. 2 www.nbmg.unr.edu, [email protected] 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 due to atmospheric conditions; therefore, scale and proportions may not be exact on plots of this map.