Iron redistribution during postore stage at uranium deposits of the Khiagda ore field, Vitim district

Kochkin, B. T.; Tarasov, N. N.; Величкин, В. И.; Нестерова, М. В.; Novgorodtsev, A. A.; Shulik, L. S.

doi:10.1134/s1075701514010048

Cited by 11 publications

(2 citation statements)

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“…(3) inflow of reducing waters through fault zones from the basement (Mashkovtsev et al, 2010;Kochkin et al, 2014); inflow sources of cold carbonic water with pH ~ 5 in the ore-bearing horizons (Kochkin et al, 2017a). Taking into account these features of the KhOF, two stages are distinguished in the development of its ore-forming system: the first is infiltration ore formation with the involvement of meteoric oxygen-containing waters; the second is conservation of uranium ores (Kochkin et al 2017b).…”

Section: Geology Of the Depositmentioning

confidence: 99%

Post-Ore Processes of Uranium Migration in the Sandstone-Hosted Type Deposits: 234U/238U, 238U/235U and U–Pb Systematics of Ores of the Namaru Deposit, Vitim District, Northern Transbaikalia

et al. 2021

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To assess the nature of the post-ore behaviour of uranium in the Namaru deposit (Khiagda ore field), U–Pb isotope systems and the isotopic composition of uranium (234U/238U and 238U/235U) were studied. The studied samples represent different ore zones of the deposit and were collected along cross-sections both vertically and horizontally. Wide variations in the isotopic composition of uranium and U–Pb isotopic age have been established. Deviations of the 234U/238U ratio from equilibrium values, which for some samples exceed 50%, along with significant variations in the isotopic age, indicate that permafrost layer, which covered the catchment areas of paleovalleys with meteoric oxygen-containing waters ca. 2.5 Ma ago, did not lead to preserving uranium ores at the deposit. Uranium migration took place during the Quaternary period. The effective combining the U–Pb dating and 234U/238U data in assessing the post-ore redistribution of uranium made it possible to recognize: removal of uranium from some zones of the ore body and its accompanying redeposition in others. Wide variations in the 238U/235U (137.484–137.851) ratios throughout the entire studied cross-sections can be explained by the different locations of samples relatively to the ore deposition front and change in redox conditions as this front advanced. Depletion of the light isotope 235U in the lower zone of the ore body may be associated with the influence of ascending carbonic waters established in the regional basement. The effect of such waters on uranium-bearing rocks causes predominant leaching of light 235U.

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Section: Geology Of the Depositmentioning

confidence: 99%

Post-Ore Processes of Uranium Migration in the Sandstone-Hosted Type Deposits: 234U/238U, 238U/235U and U–Pb Systematics of Ores of the Namaru Deposit, Vitim District, Northern Transbaikalia

et al. 2021

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“…In recent decades, integrated hydrogeochemical parameters and the corresponding conceptual models for uranium transport and deposition have been identified. From the recharge area to the basin interior, groundwater hydrochemistry evolves gradually from low to higher salinity, from HCO 3 to HCO 3 -SO 4 , and SO 4 -Cl; dissolved O 2 and Eh value decrease gradually; pH tends to change from weakly alkaline to neutral and to weakly acidic; and H 2 S shows an increasing tendency (Shujuan and Guangcai, 2011;Kochkin et al, 2014). Based on the changes in these parameters, the hydrogeochemical environment of aquifers can be divided into three zones:…”

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confidence: 99%

Spatial distribution of uranium and metalloids in groundwater near sandstone-type uranium deposits, Southern Mongolia

et al. 2016

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In the Dornogobi Aimag region of Southern Mongolia, the main source of groundwater contamination by U, As, and Se is hydrogenic-or sandstone-type uranium deposits. These environmentally hazardous deposits, located in close proximity to populated settlements, pose a serious threat to drinking water quality and human health. Fifty samples were analyzed and levels of uranium were found to be elevated in deep and shallow waters (200 and 34.7 mg/L, respectively), with nearly 25% exceeding the World Health Organization (WHO) guideline level for drinking water quality (30 mg/L).Local rocks and soils appear to be the natural source of uranium. In particular, water from deep hydrologic wells near the largest deposits (Dulaan Uul and Zoovch Ovoo) exceeds the WHO guideline levels for U, As, Se, Sb, Cd, and Fe. At the same time, shallow groundwater (Argalant area) contains 50.5 mg/L of As, 34.7 mg/L of U, and 35.9 mg/L of Cd. Although multiple metal and metalloid contamination of groundwater is an issue of global concern, our understanding of the physical-chemical conditions of its accumulation is limited. This study provides a plausible explanation of the geochemical situation at the uranium Dornogobi province based on thermodynamic calculations.

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Uranium Isotope Variations (234U/238U and 238U/235U) and Behavior of U−Pb Isotope System in the Vershinnoe Sandstone-Type Uranium Deposit, Vitim Uranium Ore District, Russia

et al. 2022

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Iron redistribution during postore stage at uranium deposits of the Khiagda ore field, Vitim district

Cited by 11 publications

References 1 publication

Post-Ore Processes of Uranium Migration in the Sandstone-Hosted Type Deposits: 234U/238U, 238U/235U and U–Pb Systematics of Ores of the Namaru Deposit, Vitim District, Northern Transbaikalia

Post-Ore Processes of Uranium Migration in the Sandstone-Hosted Type Deposits: 234U/238U, 238U/235U and U–Pb Systematics of Ores of the Namaru Deposit, Vitim District, Northern Transbaikalia

Spatial distribution of uranium and metalloids in groundwater near sandstone-type uranium deposits, Southern Mongolia

Uranium Isotope Variations (234U/238U and 238U/235U) and Behavior of U−Pb Isotope System in the Vershinnoe Sandstone-Type Uranium Deposit, Vitim Uranium Ore District, Russia

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