Lipid Evidence for Oil Depletion by Sulfate-Reducing Bacteria during U Mineralization in the Dongsheng Deposit

作     者：Tiankai Wang Lei Jiang Chunfang Cai Yuyang Yuan Yongdong Zhang Lianqi Jia Shuangling Chen 

作者机构：Key Laboratory of Petroleum Resources ResearchInstitute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Organic GeochemistryGuangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China School of Earth Sciences and ResourcesChina University of GeosciencesBeijing 100083China 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：2018年第29卷第3期

页      面：556-563页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 0704[理学-天文学] 

基　　金：supported by the Knowledge Innovation Program of the Chinese Academy of Sciences(No.KZCX2-YW-JC102) the National Basic Research Program of China(No.2011CB808800) the China National Funds for Distinguished Young Scientists(No.41125009) 

主　　题：fatty acids sulfate-reducing bacteria(SRB) individual lipid carbon isotope sulfur isotope uranium deposit. 

摘      要：Fatty acids were extracted from fluid inclusions, and analyzed for distribution and individual 613C values to determine if there exists sulfate-reducing bacteria （SRB） and what substrates SRB depleted during U mineralization in the Dongsheng deposit. The 10-methylhexadecanoic acid （10Mel6：0） has been detected from most of the samples using GC-MS based on relative retention time and co-injection of standard 10Me16：0 compound. Samples with higher 10Me16： 0 concentrations, show higher U contents. The presence of 10Mel6：0 along with iso-ω7-cis-heptadecenoic acid （i17：1ω7c） and ω7-cisoctadecenoic acid （18：1ω7c） in the fluid inclusions may indicate the occurrence of SRB during the U mineralization. Saturated fatty-acids and unsaturated fatty-acids detected in this study have individual δ^13C values from-30.3‰ to-28.5‰ and-30.5‰ to-27.9‰, respectively. These values are close to those of n-alkanes of the associated oils and the bulk oils, but significantly distinct from methane, thus the oils are concluded to have been used as substrate for the microorganisms to survive on. This proposal is supported by oil biodegradation and ore-stage calcite cement with δ^13C values from-1.4‰ to-17.2‰.