Hydrouranium Anomalies as an Effective Tool in Exploration of Concealed Unconformity Related U-deposit in Srisailam Subbasin, Andhra Pradesh - Case Study from Chitrial Area

Verma, M.B.; Dandele, P. S.; Babu, G. Nagendra; Umamaheswar, K.; Maithani, P. B.

doi:10.1007/s12594-011-0108-2

Cited by 11 publications

(4 citation statements)

References 5 publications

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“…The prevalence of non-crystalline U (IV) as a reduced uranium species suggests the long-term persistence of this species in this environment. Nonetheless, future studies are needed for detailed physico-chemical characterization of non-crystalline U (IV) in other sandstone-hosted U ore deposits 54 55 56 57 58 in order to quantify the global significance of this form of U and to improve our current understanding of its mobility, toxicity and environmental impact.…”

Section: Resultsmentioning

confidence: 99%

Biogenic non-crystalline U(IV) revealed as major component in uranium ore deposits

Bhattacharyya

Campbell

Kelly³

et al. 2017

Nat Commun

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Historically, it is believed that crystalline uraninite, produced via the abiotic reduction of hexavalent uranium (U(VI)) is the dominant reduced U species formed in low-temperature uranium roll-front ore deposits. Here we show that non-crystalline U(IV) generated through biologically mediated U(VI) reduction is the predominant U(IV) species in an undisturbed U roll-front ore deposit in Wyoming, USA. Characterization of U species revealed that the majority (∼58-89%) of U is bound as U(IV) to C-containing organic functional groups or inorganic carbonate, while uraninite and U(VI) represent only minor components. The uranium deposit exhibited mostly 238U-enriched isotope signatures, consistent with largely biotic reduction of U(VI) to U(IV). This finding implies that biogenic processes are more important to uranium ore genesis than previously understood. The predominance of a relatively labile form of U(IV) also provides an opportunity for a more economical and environmentally benign mining process, as well as the design of more effective post-mining restoration strategies and human health-risk assessment.

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Section: Resultsmentioning

confidence: 99%

Biogenic non-crystalline U(IV) revealed as major component in uranium ore deposits

Bhattacharyya

Campbell

Kelly³

et al. 2017

Nat Commun

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“…Several types of uranium deposits, including sandstone ores, exhibit abundant organic material (17)(18)(19)(20)(21)(22)(59)(60)(61)(62)(63), sulfate/sulfide (17,22), dissolved organic carbon (DOC) up to 50 mg/L (59), and uranium up to micromolar concentrations (59,61,(64)(65)(66). Although acetate was the dominant DOC in the present investigation, monomeric U(IV) and uraninite are both produced in the presence of a wide variety of electron donors (7-9, 12, 14).…”

Section: Implications For Uranium Bioremediation and Reactive Transportmentioning

confidence: 99%

Uranium redox transition pathways in acetate-amended sediments

Bargar

Williams

Campbell

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

175

233

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Redox transitions of uranium [from U(VI) to U(IV)] in low-temperature sediments govern the mobility of uranium in the environment and the accumulation of uranium in ore bodies, and inform our understanding of Earth's geochemical history. The molecular-scale mechanistic pathways of these transitions determine the U(IV) products formed, thus influencing uranium isotope fractionation, reoxidation, and transport in sediments. Studies that improve our understanding of these pathways have the potential to substantially advance process understanding across a number of earth sciences disciplines. Detailed mechanistic information regarding uranium redox transitions in field sediments is largely nonexistent, owing to the difficulty of directly observing molecular-scale processes in the subsurface and the compositional/physical complexity of subsurface systems. Here, we present results from an in situ study of uranium redox transitions occurring in aquifer sediments under sulfate-reducing conditions. Based on molecular-scale spectroscopic, pore-scale geochemical, and macroscale aqueous evidence, we propose a biotic-abiotic transition pathway in which biomass-hosted mackinawite (FeS) is an electron source to reduce U(VI) to U(IV), which subsequently reacts with biomass to produce monomeric U(IV) species. A species resembling nanoscale uraninite is also present, implying the operation of at least two redox transition pathways. The presence of multiple pathways in low-temperature sediments unifies apparently contrasting prior observations and helps to explain sustained uranium reduction under disparate biogeochemical conditions. These findings have direct implications for our understanding of uranium bioremediation, ore formation, and global geochemical processes. metal reduction | roll front | sulfate reduction | sulfide | bioreduction

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“…21.7; Verma et al 2008Verma et al , 2011. In the Chitrial area, mineralization occurs in the structurally weak zones between the basement biotite granite and the overlying Srisailam quartzite, intercalated with siltstone and shale, at shallow depths of about 60 m (Fig.…”

Section: Mineralization In Cuddapah Basinmentioning

confidence: 96%

Chapter 21 Mineral potential of Proterozoic intracratonic basins in India

Deb

Pal

2015

Memoirs

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There are three large intracratonic basins (Vindhyan, Cuddapah and Chattisgarh) and several smaller basins (Kaladgi, Bhima, Pakhal, Penganga, Indravati, Khariar, Sabari and Kolhan) covering a large part of peninsular India. They are not known to host any significant metallic resource -except for a substantial uranium resource and Pb-Zn sulphide mineralization in the Cuddapah Basin, uranium in Bhima and Kaladgi basins and manganese in the Penganga sequence -but are nevertheless the repository of vast resources of industrial rocks (limestone, dolomite, phosphorite, aluminous laterite, building materials) and minerals (including pyrite, barite and diamond) in the country. The temporal distribution of these resources indicates a Mesoproterozoic age for all the deposits and occurrences except the uranium deposits in the Vempalle dolostones in the southwestern fringe of the Cuddapah Basin, which are Palaeoproterozoic in age. The Cuddapah Basin is the most intensely mineralized Proterozoic basin, with the Cumbum Formation in the Nallamalai belt hosting stratabound base metals and barite, dated c. 1.6 Ga, all the way from north to south. Potential mineralization, still undiscovered in the basin, is a large SEDEX-type Pb-Zn orebody in the vicinity of the Mangampet barite deposit and unconformity-proximal U deposits in the Kurnool Group, similar to those of the Bhima Basin.

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Hydrouranium Anomalies as an Effective Tool in Exploration of Concealed Unconformity Related U-deposit in Srisailam Subbasin, Andhra Pradesh - Case Study from Chitrial Area

Cited by 11 publications

References 5 publications

Biogenic non-crystalline U(IV) revealed as major component in uranium ore deposits

Biogenic non-crystalline U(IV) revealed as major component in uranium ore deposits

Uranium redox transition pathways in acetate-amended sediments

Chapter 21 Mineral potential of Proterozoic intracratonic basins in India

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