Lipids of sulfate-reducing bacteria and sulfur-oxidizing bacteria found in the Dongsheng uranium deposit
作者单位：Key Laboratory of Petroleum Resources Research Institute of Geology and GeophysicsChinese Academy of Sciences Graduate University of Chinese Academy of Sciences Slate Key Laboratory of Organic Geochemistry Guangzhou Institute of GeochemistryChinese Academy of Sciences Stale Key Laboratory of Organic Geochemistry Guangzhou Institute of GeochemistryChinese Academy of Sciences Department of Earth ScienceZhejiang University Department of GeochemistryYangtze University
会议名称：《中国科学院地质与地球物理研究所2012年度（第12届）学术年会》
会议日期：2013年
学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程]
基 金：supported by the Knowledge Innovation Program of the Chinese Academy of Sciences(KZCX2-YW-JC102) National Basic Research Program of China(2011CB808800)
关 键 词：fatty acids sulfatc-rcducing bacteria sulfur-oxidizing bacteria anaerobic oxidation of petroleum Dongshcng uranium deposit Ordos Basin
摘 要：U-bearing sandstones from the Dongsheng deposit in Ordos Basin contain abundant C-C fatty *** 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 Desulfobacler sp.,*** indicates the existence of sulfate-reducing bacteria(SRB) in the *** presence of sulfur-oxidizing bacteria(SOB),such as Beggiatoa and Thioploca,is indicated by significant amounts of 16:1ω7c and 18:1ω7c fatty *** existence of the SRB in the deposit,as inferred from the fatly acids,is consistent with results from fossilized microorganisms and isotopic compositions of ore-stage *** 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 *** process may have produced C-rich calcite and prominent baseline humps of unresolved complex mixtures(UCM),and 25-demethylated hopanes and tricyclic *** 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 *** assertion is supported by ore-stage pyrite withδS values as low as -39.2‰,and the lightest sulfate(about 11‰) measured during the Phanerozoic,a difference of more than 46‰.