Atomic Prospect (First Chance Group), Gold Butte District, Clark Co., Nevada, USAi
Regional Level Types | |
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Atomic Prospect (First Chance Group) | - not defined - |
Gold Butte District | Mining District |
Clark Co. | County |
Nevada | State |
USA | Country |
Latitude & Longitude (WGS84): | 36° 20' 44'' North , 114° 7' 32'' West | ||||||||||||
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Latitude & Longitude (decimal): | 36.34580,-114.12581 | ||||||||||||
GeoHash: | G#: 9qqyg081e | ||||||||||||
USGS MRDS Record: | 10269982 | ||||||||||||
Köppen climate type: | BWk : Cold desert climate | ||||||||||||
Nearest Settlements: |
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Regions containing this locality
North America Plate | Tectonic Plate |
Commodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.No minerals currently recorded for this locality.
List of minerals for each chemical element
Regional Geology
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
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Middle Miocene - Late Oligocene 11.62 - 28.1 Ma ID: 2778139 | Tuffaceous sedimentary rocks Age: Cenozoic (11.62 - 28.1 Ma) Stratigraphic Name: Horse Spring Formation Description: Consists of the Horse Spring Formation in Clark and southern Nye Counties. This unit corresponds to unit Ths from the 1978 State map, and likely represents a composite of units Ts3 and Ts2. It is poorly known and may include rocks of other ages including Cretaceous. Comments: Original map source: Crafford, A.E.J., 2007, Geologic Map of Nevada: U.S. Geological Survey Data Series 249, 1 CD-ROM, 46 p., 1 plate; Scale 1:250,000. Lithology: Major:{sedimentary} Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133] |
Early Miocene - Late Oligocene 15.97 - 28.1 Ma ID: 3182365 | Horse Spring Formation, Thumb Member, algal limestone facies Age: Cenozoic (15.97 - 28.1 Ma) Stratigraphic Name: Thumb Member Description: Shown only in northeast part of quadrangle, at East Longwell Ridge and in the Virgin Mountains. These rocks were originally mapped as part of the upper limestone unit of the Rainbow Gardens Member (Bohannon, 1983, 1984; Beard and Campagna, 1991, Beard, 1992), but were determined to be facies of the Thumb Member by Beard (1996) and to overlie an unconformity at the top of the Rainbow Gardens in the Virgin Mountain area. Similar facies rocks are also probably in the Frenchman Mountain area but not shown separately here. Limestone is dark to medium gray, typically well bedded with algal laminations and locally hemispheroidal algal mounds and oncolites. They grade rapidly laterally or upward to white thin bedded dolomitic limestone with spring mound features or to fine-grained clastic rocks (Thtf) and gypsum (Thtg). The base of the section is locally marked by granule to small cobble conglomerate containing clasts of underlying Rainbow Gardens upper carbonate unit, or in rare outcrops, landslide breccia masses of Rainbow Gardens carbonate that intertongue laterally with the algal limestone Comments: The Horse Spring Formation is a pre- to syn-extension basin deposit defined by Longwell (1921, 1922) and divided into four members by Bohannon (1984). The four members are, in descending order, the Lovell Wash, Bitter Ridge Limestone, Thumb, and Rainbow Gardens Members. They range in age from as young as 13 Ma to about 24 Ma or older. Geochronologic data published since Bohannon (1984) originally defined the Horse Spring Formation members indicates that the stratigraphic relations between the members are quite complex, because deposition was mostly syntectonic with basin evolution. Although Bohannon originally defined the Lovell Wash Member as about 13 to 12 Ma and Bitter Ridge Member as 13.5 to 13 Ma, more recent geochronologic data have suggested that the upper part of the Bitter Ridge Member may be time correlative to the Lovell Wash Member, and the lower part of the Bitter Ridge Member may be time correlative to upper parts of the Thumb Member (Castor and others, 2000, Lamb and others, 2005). We consider the revised range of the two upper members to be from 14.3 to 13.0 Ma. Bohannon (1984) bracketed the Thumb Member to be between 17.2 and 13.5 Ma in age. In the south Virgin Mountain area this unit is more tightly constrained between ~16.2 and 14.2 Ma (Beard, 1996). New 40Ar/39Ar dates on sanidine and biotite (Donatelle and others, 2005; Martin, 2005) from the Thumb Member within the Echo Wash area range from 16.4 (biotite) to 14.6 Ma (sanidine). We consider the Thumb Member age to be most likely between about 14.2 to 16.4 Ma. Beard (1996) recognized a disconformity to angular unconformity between the Thumb and underlying Rainbow Gardens Members. Although Bohannon considered the Rainbow Gardens Member to be no older than 20 Ma, Beard (1996) reported 40Ar/39Ar ages ranging from ~26.0 to less than 18.8 Ma in the South Virgin Mountains. Carpenter and others (1989) also reported a K/Ar age on biotite of 24.3 ± 1.0 Ma from a vitric tuff in the Rainbow Gardens Member in the northern Grand Wash trough Reference: Beard, L.S., R.E. Anderson, D.L. Block, R.G. Bohannon, R.J. Brady, S.B. Castor, E.M. Duebendorfer, J.E. Faulds, T.J. Felger, K.A. Howard, M.A. Kuntz, and V.S. Williams. Preliminary Geologic Map of the Lake Mead 30' X 60' Quadrangle, Clark County, Nevada, and Mohave County, Arizona. U.S. Geological Survey Open-File Report 2007-1010 version 1.0. [151] |
Permian 251.902 - 298.9 Ma ID: 3187666 | Paleozoic sedimentary rocks Age: Phanerozoic (251.902 - 298.9 Ma) Lithology: Sedimentary rocks Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154] |
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