A uranium-bearing rhyolitic tuff deposit near Coaldale, Esmeralda County, Nevada

Duncan, Donald Cave

doi:10.3133/cir291

Cited by 3 publications

(2 citation statements)

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“…Typically they consist of secondary minerals erratically distributed on fractures or along bedding planes. Some deposits of this type may have a hydrothermal origin (Duncan, 1953a)e but in most cases the uranium seems to have been leached from the host rocks and redeposited along fractures or in favorable rocks by ground water, as suggested by Gill and Moore (1955) for carnotite-bearing tuffaceous sandstone in South Dakota,, Most known deposits of this type are in areas where the climate is arid or semiarid.…”

Section: Othersmentioning

confidence: 99%

Notes on the geology of uranium

Klepper¹,

Wyant²,

Duncan³

et al. 1956

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Igneous processes tend to concentrate uranium in late phase differentiates of magmas, notably in pegmatites, small alkalic plutons, and veins and other epigenetic deposits. The concentrations in igneous rocks are syngenetic. They may be large but are low-grade. Vein and other epigenetic deposits associated with igneous rocks are generally relatively small, but some are high-grade. Weathering and sedimentary processes may either disperse or concentrate uranium, depending primatily on climate. Some primary , uranium-bearing minerals accumulate in placers. Others are dissolved and the uranium is transported by ground and surface waters from which it may be precipitated in favorable receptors to form epigenetic deposits. Most deposits thus formed are relatively low-grade but some are large. Some uranium in solution reaches the sea and may be extracted to form large low-grade accumulations in phosphorites or black fhales, Metamorphic processes may affect concentrations of uranium either by converting pre-existing rocks to magma, which subsequently may form uranium-rich differentiates, or by "sweating" uranium out of weakly uraniferous rocks and concentrating it in favorable geologic settings.Most of the world's important uranium deposits are clustered in a few areas or provinces that perhaps represent uranium-rich portions of an originally inhomogeneous crust. These uranium-rich provinces apparently persist through long periods of geologic time. Within them, some types of uranium-rich rocks and uranium deposits may be relatively short lived, depending on the geologic history and climate; but, as they are destroyed by erosion or metamorphism, others in equilibrium with the prevailing environment may form.

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Section: Othersmentioning

confidence: 99%

Notes on the geology of uranium

Klepper¹,

Wyant²,

Duncan³

et al. 1956

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“…In the northern part of Basin and Range province, uranium occurs in veins in rhyollte breccia In the Kings River and McDerraitt area, Huraboldt County, Nevada and adjoining Oregon; In Lassen and Kern Counties, California; and In Esmeralda, Lincoln, and Washoe Counties, Nevada (Sharp, 1956;Staatz and Carr, 1964;Yates, 1952;Duncan, 1953).…”

Section: Uranium Provincesmentioning

confidence: 99%