Geologic Map of the Tonopah 1° by 2° Quadrangle, Central Nevada

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Geologic Map of the Tonopah 1° by 2° Quadrangle, Central Nevada U.S. DEPARTMENT OF THE INTERIOR TO ACCOMPANY MAP MF-1877-A U.S. GEOLOGICAL SURVEY GEOLOGIC MAP OF THE TONOPAH 1° BY 2° QUADRANGLE, CENTRAL NEVADA By Donald H. Whitebread and David A. John INTRODUCTION Qb Basalt of Lunar Crater area This map is part of a folio of maps of the (Quaternary) Lava flows and local Tonopah 1° by 2° quadrangle, Nevada, prepared cinders and dikes under the Conterminous United States Mineral Tba Basalt and andesite flows Assessment Program. (Tertiary) As mapped, probably includes some Quaternary lava flows in DESCRIPTION OF MAP UNITS Pancake Range. Includes trachyandesite of Red Mountain and trachyandesite of Thunder Mountain in San Antonio SURHCIAL DEPOSITS Mountains Qa Alluvial, lacustrine, and eolian Tr4 Rhyolitic rocks (Tertiary) Rhyolitic deposits (Quaternary) A s to dacitic flows, dikes, and small mapped, locally includes Tertiary gravel intrusive bodies. Includes Brougher QTIs Landslide deposits (Quaternary and Rhyolite of Bonham and Garside (1979) Tertiary) and Oddie Rhyolite 734 Andesitic rocks (Tertiary) Andesitic SEDIMENTARY ROCKS AND to latitic flows, volcanic breccia, and UNCONSOLIDATED DEPOSITS dikes Includes Gilbert Andesite, Mizpah Trachyte, and volcanics of Lime Ts4 Sedimentary rocks and bedded tuff Mountain of Bonham and Garside (Tertiary) Tuffaceous siltstone and (1979) sandstone, bedded tuff, and diatomite. Tas Andesitic rocks (Tertiary) Andesitic Includes Esmeralda and Siebert to latitic flows, flow breccias, sills, Formations. K-Ar ages about 11-13 Ma dikes, and plugs (Evernden and James, 1964; Evernden Tfs Rhyolitic rocks (Tertiary) Rhyolitic and others, 1964) for Esmeralda to dacitic flows, dikes, sills, and Formation and 13-17 Ma (Bonham and irregular small intrusive bodies Garside, 1979) for Siebert Formation Ta2 Andesitic rocks (Tertiary) Andesitic Ts3 Sedimentary rocks and bedded tuff to latitic flows, flow breccias, dikes, (Tertiary) Sandstone and siltstone, sills, and minor intrusive bodies commonly tuffaceous. Some interbeds Tr2 Rhyolitic rocks (Tertiary) Rhyolitic and lenses of conglomerate and minor to dacitic flows and small intrusive tuff bodies. Commonly flow banded. Ts2 Sedimentary rocks and bedded tuff Includes some rhyolitic tuff in (Tertiary) Tuffaceous siltstone and Shoshone Mountains sandstone, limestone, minor Ta1 Andesitic rocks (Tertiary) Andesitic conglomerate, and bedded tuff. Includes to latitic flows. Locally, includes some Gilmore Gulch Formation bedded tuff and tuffaceous sedimentary Ts1 Sedimentary rocks and bedded tuff rocks (Tertiary) Tuffaceous siltstone and Tr-i Rhyolitic rocks (Tertiary) sandstone, conglomerate, limestone, Rhyolitic, quartz latitic, and rhyodacitic and bedded tuff lava flows, locally flow banded, and rhyolitic dikes. Includes some LAVA FLOWS AND SHALLOW INTRUSIVE ROCKS tuffaceous sedimentary rocks and bedded [K-Ar ages published before 1977 are corrected tuff using the constants recommended by IUGS Subcommission on Geochronology (Dalrymple, 1979)] ASH-FLOW TUFFS and volcaniclastic sedimentary rocks. [K-Ar ages published before 1977 are corrected Most of Darrough Felsite is Cretaceous using the constants recommended by IUGS and (or) older in age as described by Subcommission on Geochronology Brem and others (1991), but in the area (Dalrymple, 1979)] of this report, unit is considered to consist of rocks of both Mesozoic and Area 1 Tertiary age (G.F. Brem, written commun., 1986) Tt4 Ash-flow tuff (Tertiary) Pumice-rich Mzt Ash-flow tuff (Mesozoic) Dacitic and and lithic-rich tuff. Locally, includes rhyodacitic ash-flow tuff and minor sedimentary rocks sandstone and conglomerate Tf Fraction Tuff (Tertiary) Nonwelded to densely welded, crystal-poor, locally Area 2 lithic-rich quartz latitic to rhyolitic ash- flow tuff Tbm Bates Mountain Tuff (Tertiary) Tt3 Ash-flow tuff (Tertiary) Crystal-rich Grayish- to pinkish-orange, moderately to crystal-poor rhyolitic ash-flow tuff. welded, crystal-poor rhyolitic ash-flow Includes tuffs of Goldyke and Sheep tuff Canyon in Paradise Range Tt2 Ash-flow tuff (Tertiary) Rhyolitic to Ttt Tuff ofToiyabe (Tertiary) Densely rhyodacitic ash-flow tuff. Includes tuffs welded, crystal-rich quartz latitic to of Meadow Canyon, Trail Canyon, and rhyolitic welded tuff. Equivalent in part Ryecroft Canyon to the now-abandoned Toiyabe Quartz Tpc Tuff of Peavine Creek (Tertiary) Latite as mapped by Ferguson and Buff to light-brown, nonwelded to Cathcart (1954) and Kleinhampl and densely welded, crystal-poor rhyolitic Ziony (1985) (see John, 1992) ash-flow and ash-fall tuff Tt2 Ash-flow tuff (Tertiary) Rhyolitic to Trr Round Rock Formation (Tertiary) rhyodacitic ash-flow tuff. Includes some Crystal-poor, latitic, quartz latitic, and tuffaceous sedimentary rocks and rhyolitic, lithic-rich, ash-flow and ash- rhyolitic flows. In western part of fall tuff and subordinate interbedded quadrangle includes tuffs of Gabbs sandstone Valley, Davis Mine, Pactolus, Crow Tmj Tuff of Mount Jefferson (Tertiary) Springs, Castle Peak, and Summit Reddish-brown, poorly to densely Spring and Mission Spring Formation welded, moderately crystal-rich, of Vitaliano and Vitaliano (1972). In rhyolitic to rhyodacitic ash-flow tuff Toiyabe Range includes tuffs of Cloverdale, Rainier Mountain, North Area 3 Fork, and Mahogany Mountain Tad Tuff of Arc Dome (Tertiary) Gray to Tsw Tuff of Saulsbury Wash (Miocene) pale-red, densely welded, crystal-rich Reddish-brown to purple, crystal-rich rhyolitic ash-flow tuff. Contains rhyolitic welded ash-flow tuff conspicuous smoky quartz phenocrysts Tt2 Ash-flow tuff (Tertiary) Rhyolitic to Tpc Tuff of Peavine Creek (Tertiary) rhyodacitic ash-flow tuff. Includes some Buff to light-brown, nonwelded to tuffaceous sedimentary rocks and densely welded, crystal-poor rhyolitic rhyolitic flows. Includes tuffs of Black ash-flow and ash-fall tuff Beauty Mesa, Buckwheat Rim, Buckskin Trr Round Rock Formation (Tertiary) Point, Lunar Cuesta, Orange Lichen Crystal-poor, latitic, quartz latitic, and Creek, Pott Hole Valley, Crested Wheat rhyolitic lithic-rich ash-flow and ash- Ridge, Moores Station Buttes, The fall tuff. Subordinate interbedded Needles, Palisade Mesa, and Halligan sandstone Mesa T^ Ash-flow tuff (Tertiary) Rhyolitic Tsp Shingle Pass Tuff (Tertiary) ash-flow tuff and lava flows. Age Reddish-gray, pale-red, dark-red, and distinction from younger tuff units pale-red purple, nonwelded to densely based on more strongly altered welded crystal-poor rhyolitic ash-flow character. Consists of tuffs of Davis tuff mine and Pactolus in Paradise Range and Tkc Tuff of Kiln Canyon (Tertiary) Mission Spring Formation of Vitaliano Light-gray to grayish-orange to dark- and Vitaliano (1972) in Shoshone reddish-brown, nonwelded to densely Mountains welded, locally lithic-rich, pumiceous, TMzd Darrough Felsite (Tertiary and crystal-rich rhyolitic to quartz latitic Mesozoic) Locally silicified, ash-flow tuff crystal-rich to lithic-rich rhyolitic to Tbt Tuff of Big Ten Peak (Tertiary) quartz latitic or rhyodacitic ash-flow tuff Light-gray to buff to orange, lithic-rich rhyolitic ash-flow tuff. Locally includes PLUTONIC AND INTRUSIVE ROCKS air-fall tuff and laucustrine sedimentary [Plutonic rock names based on IUGS modal rocks classification (Streckeisen, 1976)] Area 4 TMzg Granitic rocks (Tertiary or Mesozoic) Granite, granodiorite, Tbm Bates Mountain Tuff (Tertiary) granodiorite porphyry, and quartz Grayish- to pinkish-orange, moderately diorite welded, crystal-poor rhyolitic ash-flow TKg Granitic rocks (Tertiary or tuff Cretaceous) Mostly fine-grained Tgw Granite-weathering tuff (Tertiary) granodiorite Reddish-gray and reddish-brown, Tg Granitic rocks (Tertiary) Granite, partially to densely welded, crystal-rich granodiorite, and quartz diorite. Unit rhyolitic welded tuff includes dike swarm near Round T\2 Ash-flow tuff (Tertiary) Rhyolitic to Mountain rhyodacitic ash-flow tuff. Includes some K/bd Dioritic rocks (Mesozoic) Mostly tuffaceous sedimentary rocks and diorite and quartz diorite. Field relations rhyolitic flows. Includes tuffs of Black do not permit age assignment other than Beauty Mesa, Buckwheat Rim, Buckskin Mesozoic Point, Lunar Cuesta, Orange Lichen MiQ Granitic rocks (Mesozoic) Granite, Creek, Pott Hole Valley, Crested Wheat granodiorite, quartz monzonite, quartz Ridge, Moores Station Buttes, The monzodiorite, and quartz diorite. Field Needles, Palisade Mesa, and Halligan relations do not permit age assignment Mesa other than Mesozoic, but most plutons Tsp Shingle Pass Tuff (Tertiary) presumably are of Late Cretaceous age Reddish-gray, pale-red, dark-red, and Kd Dioritic rocks (Cretaceous) Diorite pale-red purple, nonwelded to densely and gabbro. Ages determined welded crystal-poor rhyolitic ash-flow isotopically or by field relations with tuff rocks whose ages have been determined Tkc Tuff of Kiln Canyon (Tertiary) isotopically Light-gray to grayish-orange to dark- Kg Granitic rocks (Cretaceous) Mostly reddish-brown, nonwelded to densely granite, granodiorite, quartz monzonite, welded, locally lithic-rich, pumiceous, and quartz monzodiorite. Ages crystal-rich rhyolitic to quartz latitic determined isotopically or by field ash-flow tuff relations with rocks whose ages have Tm Monotony Tuff (Tertiary) Purplish- been determined isotopically gray to brown, partially to densely J"fig Granitic rocks (Jurassic or welded, crystal-rich rhyodacitic and Triassic) Granodiorite to quartz quartz latitic ash-flow tuff containing monzodiorite of Crow Springs pluton conspicuous biotite and quartz Jg Granitic rocks (Jurassic)
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