This report is part of a series of geologic, geochemical, and geophysical maps of the Tonopah 1° x 2° quadrangle, Nevada, prepared during studies of the area for the Conterminous United States Mineral Assessment Program (CUSMAP). Included here are 21 maps showing the distributions of selected elements or combinations of elements. These regional geochemical maps are based on chemical analyses of the minus-60 mesh (0.25 mm) fraction of stream-sediment samples and the nonmagnetic heavy-mineral concentrate derived from stream sediment. Stream sediments were collected at 1,217 sites. Our geochemical studies of mineralized rock samples provide a framework for evaluating the results from stream sediments.
\nThe Tonopah 1° x 2° quadrangle comprises about 19,100 km2 (7,450 mi2) in west-central Nevada (fig. 1). Topography is typical of the Basin and Range province, consisting of angular mountain ranges separated by broad valleys that comprise about half the area. Topographic relief is generally about 1,000 m but in some places is more than 1,500 m. Most of the ranges have well-developed drainages in steep-walled canyons occupied by intermittent streams. The climate is semi-arid to arid. Pinon pine and juniper grow in most places at elevations above 2,100 m, and sagebrush is abundant at lower elevations. Major access is provided by U.S. Routes 6 and 95, and there are numerous county maintained gravel roads and unmaintained jeep trails.
\nBedrock geology of the Tonopah quadrangle is a complex mosaic of late Precambrian to Tertiary rocks juxtaposed by numerous thrust and high-angle faults. Useful geologic summaries can be found in reports by Ross (1961), Albers and Stewart (1972), Stewart and Carlson (1978), and Kleinhampl and Ziony (1985). Mineral prospects and mines occur in igneous, metamorphic, and sedimentary rocks of all ages, and mines are particularly abundant in the central and western parts of the quadrangle. The complex geology produces clasts of mixed lithology in alluvium in all drainage basins sampled in this study, and the numerous mines and prospects probably contaminate many drainages.
\nThe geochemical maps in this report are based on analytical results reported by Fairfield and others (1985), Hill and others (1986), and Siems and others (1986). These reports also describe the sample preparation and analytical methods and provide information on the location of the sample sites.
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Other publications in this folio include U.S. Geological Survey Open-File Reports 82-419 (Barton and others, 1982), 82-599 (Klein, 1982), and 830734 (Theobald and Barton, 1983), and Miscellaneous Field Studies Maps MF-1834-A (Peterson and Tosdal, 1986), MF-1834-B (Peterson and others, 1987), MF-1834-C (Theobald and Barton, 1987), and MF-1834-D (Theobald and Barton, 1988). Open-File Reports 82-419 and 83-734 constitute the basic data and initial interpretation on which this discussion is predicated. MF-1834-C and D show the distributions of anomalous concentrations of copper, lead, molybdenum, bismuth, and tungsten.
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The area investigated includes the wilderness and approximately 150 sq mi of adjacent territory. The additional area covers several RARE II Road less Areas that were classified by the U.S. Forest Service in 1979 as Proposed Wilderness and Further Planning Areas, but were not incorporated in the Pecos Wilderness by the New Mexico Wilderness Bill. For the purpose of this report the entire area is called the study area.
\nThe study area is at the southern end of the Sangre de Cristo Range. It is characterized by an axial line of alpine peaks that rise to more than 13,000 ft, flanked on the west and north by heavily wooded ridges and canyons that drain to the Rio Grande Valley, and on the southeast by a high dissected plateau of meadows and forest. The plateau is dissected by deep canyons of the Pecos River and its tributaries, and is bounded on the east by a scarp of about 3,000 ft. Partly forested ranch land lies below the base of the scarp to the east, and beyond that is prai-rie of the Great Plains.
\nThis map is based on geologic and geochemical studies and mine and prospect investigations that were done principally in 1977 and 1979-80 (U.S. Geological Survey, U.S. Bureau of Mines, and New Mexico Bureau of Mines and Mineral Resources, 1980; Lane, 1980; Moench and Robertson, 1980; Moench, Robertson, and Sutley, 1980; Moench and Erickson, 1980; Moench, Grambling, and Robertson, 1988; Moench, Sutley, and Erickson, 1988; Erickson, Sutley, and Moench, 1986). An aeromagnetic survey covering almost all of the Pecos Wilderness was flown in 1970. The resulting aeromagnetic map was published by Moench and others (1980) and interpreted in that report by Lindreth Cordell. Cordell found no correlation between magnetic features and geologic terraines having mineral resource potential.
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