Favorable areas for prospecting adjacent to the Roberts Mountains thrust in southern Lander County, Nevada

Stewart, John H.; McKee, Edwin H.

doi:10.3133/cir563

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…Biometric analyses of individual variation are especially appropriate in connection with rugose coral species discrimination. Studies by Oliver (1960a;1968) and Rozkowska (1960) effectively present these data graphically as ratio curves or scatter diagrams. The most commonly used ratio is that of septal count relative to mature corallite diameter.…”

Section: Growth Changes and Reproductive Featuresmentioning

confidence: 99%

Lower and lower Middle Devonian rugose corals of the central Great Basin

Merriam¹

1974

Professional Paper

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Section: Growth Changes and Reproductive Featuresmentioning

confidence: 99%

Lower and lower Middle Devonian rugose corals of the central Great Basin

Merriam¹

1974

Professional Paper

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“…The pyrite cubes are euhedral and much larger than the silt grains, indicating that they were not introduced into the rock as detritus, and are likely diagenetic. The favorableness of the lower-plate carbonate rocks in general and the Roberts Mountains Limestone in particular for the occurrence of low-grade gold deposits in northcentral Nevada has been noted in many recent publications (Roberts, 1960(Roberts, , 1966Roberts and others, 1967;Hardie, 1966;Stewart and McKee, 1968;others, 1961, 1966;Erickson, Masursky, and others, 1964). The Wenban Limestone, described by Gilluly and Masursky (1965, p. 29-38), is massive to thinbedded argillaceous, bioclastic, gray limestone that discussed by several authors (Roberts, 1960(Roberts, , 1966Roberts and others, 1967;Hardie, 1966;Stewart and McKee, 1968;others, 1961, 1966;Erickson, Masursky, and others, 1964).…”

mentioning

confidence: 86%

Geology and geochemistry of the Cortez gold deposit, Nevada

Wells¹,

Stoiser²,

Elliott³

1969

Economic Geology

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Gold has been discovered recently at Cortez, Nevada, about 45 miles southwest of Carlin in carbonate rocks in a window of the Roberts Mountains thrust. The host rock consists of laminated to thin-bedded dark-to light-gray, silty dolomitic limestone and calcareous dolomitic siltstone in the upper part of the Silurian Roberts Mountains Limestone. These rocks contain sparse pyrite cubes and aggregates and some organic carbon. The rocks have been faulted and folded repeatedly during their complex geologic history. The gold is disseminated in a large zone where the rocks have been fractured and bleached and the pyrite oxidized. During oxidation the iron was redistributed, giving the rock a color ranging from light gray to dark red. The alteration zone envelops a 34-m.y.-old intrusive body of biotite-quartz-sanidine porphyry, which is also altered. No genetic relationship between the mineralization and the intrusive body is known. Silicification, iron-oxide staining, decalcification and, in extreme cases, dedolomitization generally accompanied the gold metallization, although any one of these phases of hydrothermal alteration may have been well developed without introduction of significant amounts of gold. Some clay alteration occurred in the igneous rock but none in the ore body. The gold is in micron-sized particles of native gold. Gold is taostly with silica between original silt grains and to a lesser extent in quartz-filled microfractures and hematite-goethite pseudomorphs after pyrite. The gold was discovered during the examination of an arsenic-antimony-tungstenmercury geochemical anomaly known in the area. Other gold deposits in north-central Nevada are associated with such anomalies. Contents

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“…The Paleozoic rock consists of Cambrian, Ordovician, Silurian, and Devonian strata that occur in several thrust plates which juxtapose strata of different facies. Three major thrust plates (lower, middle, and upper) are recognized (Stewart and McKee, 1968a;p. 3) in the Toiyabe Range. south ofAustin.…”

Section: General Geologymentioning

confidence: 99%

Aeromagnetic and generalized geologic map of the Austin area, Lander County, Nevada

Davis¹,

Stewart²

1970

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Favorable areas for prospecting adjacent to the Roberts Mountains thrust in southern Lander County, Nevada

Cited by 3 publications

References 4 publications

Lower and lower Middle Devonian rugose corals of the central Great Basin

Lower and lower Middle Devonian rugose corals of the central Great Basin

Geology and geochemistry of the Cortez gold deposit, Nevada

Aeromagnetic and generalized geologic map of the Austin area, Lander County, Nevada

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