Biogenic and petroleum-related ore-forming processes in Dongsheng uranium deposit, NW China

Cai, Chunfang; Li, Hongtao; Qin, Mingkuan; Luo, Xiaorong; Wang, Feiyu; Ou, Guangxi

doi:10.1016/j.oregeorev.2006.05.003

Cited by 91 publications

(42 citation statements)

References 35 publications

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“…If incorporated into precipitating mackinawite and retained during transformation to FeS 2 (48), this reaction sequence could produce biological enrichment of 32 S in pyrite similar to that observed in uranium ores (17)(18)(19)(20)(21).…”

Section: S-enriched Hsmentioning

confidence: 98%

“…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%

“…Sulfate-reducing bacteria (SRB) are important in the mineralization of FeS 2 in low-temperature sandstone-type ores, sustained by transfer of electrons from organic carbon [hydrocarbons (17)(18)(19)(20), plant materials (21,22), or their fermentative products] to sulfate (17,21). SRB along with metal-reducing bacteria (MRB) (23,24) also are capable of enzymatically reducing U(VI) to U(IV).…”

mentioning

confidence: 99%

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Uranium redox transition pathways in acetate-amended sediments

Bargar

Williams

Campbell

et al. 2013

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

174

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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Section: S-enriched Hsmentioning

confidence: 98%

Section: Implications For Uranium Bioremediation and Reactive Transportmentioning

confidence: 99%

mentioning

confidence: 99%

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Uranium redox transition pathways in acetate-amended sediments

Bargar

Williams

Campbell

et al. 2013

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

174

233

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“…Affected by the Mesozoic IndosinianYanshan and Cenozoic Himalayan movements, many faults have developed in the northern part of the basin, which may have acted as major pathways for upward migration of petroleum from deep strata. The host sandstone experienced maximum burial and heating during the end of the Early Cretaceous, and had palaeo-temperatures of <70°C, based on reconstruction of the burial and thermal history from well S1 (Figure 1(a)) [11].…”

Section: Geological Settingmentioning

confidence: 99%

“…However, little direct evidence of biogenically precipitated U minerals, and mainly of morphological nature, has been provided for uranium deposits [5,15]. Recently, robust mineralogical and geochemical evidence has been presented for the involvement of bacterial activity in the genesis of Dongsheng rollfront-type deposits of China [10,11,16]. The deposit has the latest stage of mineralization ages between 9.8-22 Ma.…”

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confidence: 99%

Lipids of sulfate-reducing bacteria and sulfur-oxidizing bacteria found in the Dongsheng uranium deposit

et al. 2012

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U-bearing sandstones from the Dongsheng deposit in Ordos Basin contain abundant C 15 -C 18 fatty acids. The fatty acids may have been derived from modern and ancient organisms including organisms from the intervals of U mineralization. A certain amount of i15:0, a15:0, a17:0 fatty acids coexist with small amounts of i17:1ω7c and 10me16:0, characteristic biomarkers of Desulfovibrio and Desulfobacter sp., respectively. This indicates the existence of sulfate-reducing bacteria (SRB) in the sandstones. The presence of sulfur-oxidizing bacteria (SOB), such as Beggiatoa and Thioploca, is indicated by significant amounts of 16:1ω7c and 18:1ω7c fatty acids. The existence of the SRB in the deposit, as inferred from the fatty acids, is consistent with results from fossilized microorganisms and isotopic compositions of ore-stage pyrite. This suggests that the environment may have been favorable for the SRB to grow since ore formation (9.8-22 Ma). The bacteria may have degraded hydrocarbons directly, or indirectly utilized hydrocarbons degraded by oxic microbes in the deposits. This process may have produced 12 C-rich calcite and prominent baseline humps of unresolved complex mixtures (UCM), and 25-demethylated hopanes and tricyclic terpanes. The existence of sulfur-oxidizing bacteria and sulfate-reducing bacteria in the deposit may have resulted in bacterial sulfate reduction to sulfide, re-oxidization of the sulfide to sulfate and subsequent reduction of the sulfate to sulfide. This assertion is supported by ore-stage pyrite with δ 34 S values as low as −39.2‰, and the lightest sulfate (about 11‰) measured during the Phanerozoic, a difference of more than 46‰.

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U-Ore Mineralization of Hypergenesis Reduction Zone: Uranium “Blacks”

Doynikova

2021

Uranous Mineralogy of Hypergene Reduction Region

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Biogenic and petroleum-related ore-forming processes in Dongsheng uranium deposit, NW China

Cited by 91 publications

References 35 publications

Uranium redox transition pathways in acetate-amended sediments

Uranium redox transition pathways in acetate-amended sediments

Lipids of sulfate-reducing bacteria and sulfur-oxidizing bacteria found in the Dongsheng uranium deposit

U-Ore Mineralization of Hypergenesis Reduction Zone: Uranium “Blacks”

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