The genesis of the uranium mineralizationin the Shangulezhskaya area (Eyastern CIS-Sayan region)

Mikhailov, Vitaly Alexeyevich; Mironov, Yuriy Borisovich; Efremova, U. S.

doi:10.52349/0869-7892_2022_92_85-91

Cited by 1 publication

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“…Localities of U 4+ containing minerals are more abundant from 3.2 to 2.2 Ga during the period of U enriched granites (Champion & Smithies, 2007; Robb & Meyer, 1990, 1995) and detrital deposits (Ramdohr, 1958; Rasmussen & Buick, 1999). At the beginning of the sedimentary successions and unconformity deposit stage (2.2–0.45 Ga), the relative abundance of U 6+ minerals increases with increasing atmospheric O 2 until approximately 1.6 Ga agreeing with sedimentary U enrichment and the Olympic Dam deposit formation during this time period (Gauthier‐Lafaye, 1986; Mikhailov et al., 1999; Roberts & Hudson, 1983). The number of U 4+ and U 6+ localities then remained similar to each other from 1.6 Ga until approximately 0.6 Ga, while U unconformity deposits formed at 1.7–1.3 Ga (Alexandre et al., 2009) and minimal deposition took place from 1.3 to 0.5 Ga (Cuney, 2010).…”

Section: Discussionmentioning

confidence: 92%

Uranium Redox and Deposition Transitions Embedded in Deep‐Time Geochemical Models and Mineral Chemistry Networks

Moore,

Li,

Zhang

et al. 2024

Geochem Geophys Geosyst

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Uranium (U) is an important global energy resource and a redox sensitive trace element that reflects changing environmental conditions and geochemical cycling. The redox evolution of U mineral chemistry can be interrogated to understand the formation and distribution of U deposits and the redox processes involved in U geochemistry throughout Earth history. In this study, geochemical modeling using thermodynamic data, and mineral chemistry network analysis are used to investigate U geochemistry and deposition through time. The number of U6+ mineral localities surpasses the number of U4+ mineral localities in the Paleoproterozoic. Moreover, the number of sedimentary U6+ mineral localities increases earlier in the Phanerozoic than the number of U4+ sedimentary mineral localities, likely due to the necessity of sufficient sedimentary organic matter to reduce U6+–U4+. Indeed, modeling calculations indicate that increased oxidative weathering due to surface oxygenation limited U4+ uraninite (UO2) formation from weathered granite and basalt. Louvain network community detection shows that U6+ forms minerals with many more shared elements and redox states than U4+. The range of weighted Mineral Element Electronegativity Coefficient of Variation (wMEECV) values of U6+ minerals increases through time, particularly during the Phanerozoic. Conversely, the range of wMEECV values of U4+ minerals is consistent through time due to the relative abundance of uraninite, coffinite, and brannerite. The late oxidation and formation of U6+ minerals compared to S6+ minerals illustrates the importance of the development of land plants, organic matter deposition, and redox‐controlled U deposition from ground water in continental sediments during this time‐period.

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