Geochemical and mineralogical studies of a South Texas roll-front uranium deposit

Goldhaber, Martin B.; Reynolds, Richard L.

doi:10.3133/ofr77821

Cited by 8 publications

(6 citation statements)

References 8 publications

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“…Alternatively, the reduction mechanism may differ among the different roll front deposits. The Smith Ranch aquifers contain abundant fragments of organic carbon, a potential abiotic reductant, 35 while the south Texas U deposits are thought to form as a result of H 2 S gas incursion from stratigraphically lower hydrocarbon reservoirs 46,58,59 and the south Australian deposits may be a mixture of these reducing materials. 12 Chemically reducing conditions between the ore zone and down-gradient monitoring wells in MU4a are also evident from the concentration and isotopic composition of sulfate.…”

Section: Environmental Science and Technologymentioning

confidence: 99%

Isotopic Evidence for Reductive Immobilization of Uranium Across a Roll-Front Mineral Deposit

Brown

Basu

Christensen

et al. 2016

Environ. Sci. Technol.

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15We use uranium (U) isotope ratios to detect and quantify the extent of natural U reduction in 16 groundwater across a roll front redox gradient. Our study was conducted at the Smith Ranch-17 model that evaluates both the migration of U from the ore body and the extent of natural 27 attenuation due to reduction. We find that the pre-mining migration of U down-gradient of the 28 delineated ore body is minimal along eight transects due to reduction in or adjacent to the ore 29 body, whereas two other transects show little or no sign of reduction in the down-gradient 30 region. These results suggest that characterization of U isotopic ratios at the mine planning stage, 31 in conjunction with routine geochemical analyses, can be used to identify where more or less 32 post-mining remediation will be necessary. 33

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Section: Environmental Science and Technologymentioning

confidence: 99%

Isotopic Evidence for Reductive Immobilization of Uranium Across a Roll-Front Mineral Deposit

Brown

Basu

Christensen

et al. 2016

Environ. Sci. Technol.

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“…However, some uranium deposits in the United Sates lack considerable organic matter. In some south Texas uranium deposits, organic carbon is less than 0.1 percent (Goldhaber and Reynolds, 1977). These deposits are generally low grade (<500 ppm) and the genesis of uranium deposits in this case can be explained by migration of H 2 S seeping up along faults (Goldhaber et al, 1979).…”

Section: Resultsmentioning

confidence: 87%

Uranium Traps in Phreatic Sandstone-type Prospect, Taunsa Area, Dera Ghazi Khan, Eastern Sulaiman Range, Pakistan: Evidences from Autoradiography and Optical Microscopy

Ullah

Fengjuin

Zhang

et al. 2020

IJEEG

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Taunsa uranium occurrence like other uranium resources in Pakistan is hosted by the Late Miocene-Pliocene age Litra Formation of the Siwalik Group molasse sediments. Taunsa uranium prospect is a unique phreatic-type uranium resource in terms of its disturbed geological setting of the eastern limb of the Zindapir anticline in the eastern Sulaiman range. Autoradiography technique was used to locate the spots of anomalous uranium concentration in thin sections from ore of Taunsa prospect. Twenty polished thin sections from uranium ore ranging from 200 ppm-600 ppm were attached to detectors for a month which produced prominent alpha track which were used to find the traps of uranium. Subsequently, these spots were studied under SEM and EPMA for further investigations of uranium phases. Autoradiography revealed that Taunsa uranium ore is mostly associated with organic matter (probably petroleum), black shale clasts, biotite, fougerite (a green colour rusty mineral) and with micritic clasts. This study suggests that prospective facies of the host sandstone containing relatively abundant black shale clasts, organic matter and biotite may be targeted during exploratory drilling in Taunsa uranium deposit and its extensions in the eastern limb of Zindapir anticline

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“…1). The geologic setting, mineralogy, geochemistry, and genesis of the Benavides deposit have been discussed previously (Goldhaber and Reynolds, 1977;Reynolds and Goldhaber, 1978;Goldhaber and others, 1978;and Granger and Warren, 1974). Similar aspects of the Lamprecht deposit were described by Goldhaber and others (1979), and Daniels and others (1977).…”

Section: Description Of Depositsmentioning

confidence: 95%

Clay minerals in two South Texas roll-type uranium deposits

Reynolds¹,

Goldhaber²,

Blackmon³

et al. 1980

Open-File Report

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Semiquantitative X-ray diffraction techniques have been used to identify and analyze distribution patterns of clay minerals in the host rocks for two south Texas roll-type uranium deposits. In sandstone and mudstone of the Benavides deposit, emplaced in the Miocene Catahoula Tuff, raontmorillonite is the dominant clay mineral, and illite is present in small amounts. Claymineral distribution in the Lamprecht deposit, in the Miocene Oakville Sandstone, is controlled primarily by lithology: Montmorillonite is the dominant clay mineral in sandstone, whereas illite is the dominant clay in mudstone. Kaolinite is present in most samples from the Lamprecht deposit but commonly in small amounts (less than 10 percent of the total clays). Chlorite, in trace amounts, was identified in only two of 62 samples from the Lamprecht deposit. Clay-mineral distribution in the Benavides and Lamprecht deposits is not related to processes of mineralization. In contrast, clay minerals (primarily chlorite) have been concentrated in mineralized rock of some roll-type and tabular uranium deposits in Wyoming and New Mexico. Organic matter is present in host rocks for deposits having such concentrations and may have influenced clay-mineral authigenesis. The lack of claymineral zonation relative to ore zones of the Benavides and Lamprecht deposits may be due in part to the lack of organic matter in the host rocks.

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Geochemical and mineralogical studies of a South Texas roll-front uranium deposit

Cited by 8 publications

References 8 publications

Isotopic Evidence for Reductive Immobilization of Uranium Across a Roll-Front Mineral Deposit

Isotopic Evidence for Reductive Immobilization of Uranium Across a Roll-Front Mineral Deposit

Uranium Traps in Phreatic Sandstone-type Prospect, Taunsa Area, Dera Ghazi Khan, Eastern Sulaiman Range, Pakistan: Evidences from Autoradiography and Optical Microscopy

Clay minerals in two South Texas roll-type uranium deposits

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