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Mineralogical and geochemical evidence for coupled bacterial uranium mineralization and hydrocarbon oxidation in the Shashagetai deposit,NW China

Mineralogical and geochemical evidence for coupled bacterial...

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中国科学院地质与地球物理研究所2006学术年会

作者： Chunfang Cai~1,Hailiang Dong~2,Hongtao Li~1,Xinjian Xiao~3,Guanxi Ou~3, Chunming Zhang~4 1 Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,P.O. Box 9825,Beitucheng Xilu No.19,Beijing 100029,P.R.China 2 Department of Geology,Miami University,Oxford,OH 45056,USA 3 Beijing Research Institute of Uranium Geology,Beijing 100029,P.R.of China 4 Department of Geochemistry,Yangtze University,Jingzhou,Hubei 434023,PR China

Unusual mineral structures have recently been found in a sandstone-hosted roll-type uranium deposit in the Middle Jurassic Zhiluo Formation in the Shashagetai deposit,the northern Ordos basin,NW *** structures possess a chemical composition and crystal structure characteristic of mineral coffinite[(USiO)](OH)],which occurs as nanoparticles with size ranging from 5 to *** structures are interpreted to be fossilized microorganisms,based on mineralogical biosignatures including morphology,size,occurrence of biogenic coffinite as nano-crystals,and biological elements such as *** intimate intergrowth of coffinite with secondary pyrite of bacterial origin,as defined by lowδS values,and calcite cements with petroleum-derived carbon supports its biogenic *** inclusions in the host sandstone are characterized by abundant n-alkanes,slightly increased Pr/nC and Ph/nC ratios,significant amounts of demethylated hopanes and tricyclic terpanes,and the existence of unresolved complex *** characteristics are interpreted to be a result of mixing of an earlier,heavily degraded oil with a later charged fresh oil;subsequently the oils were slightly *** lines of evidence lead to the proposal that the reduction of sulfate and oxidization of petroleum are likely synchronous with reduction of hexavalent[U(Ⅵ)]to tetravalent[U(Ⅳ)]uranium by sulfate-reducing bacteria(SRB).The discovery of a natural association of microorganism-like structures,a uranium mineral,and biodegraded petroleum has implications for uranium biomineralization and fossil fuel exploration.

关键词： uranium deposit anaerobic petroleum oxidation sulfate-reducing bacteria nanoparticle microfossil sulfur isotopes

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