Sulfur and carbon isotopic variations in Neoproterozoic sedimentary rocks from southern China

作     者：CHU Xuelei~(1,2**),ZHANG Qirui~1,ZHANG Tonggang~(1,2) and FENG Lianjun~(1,2) (1.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China 2.Key Laboratory for Mineral Resources Research,Chinese Academy of Sciences,Beijing 100029,China) 

会议名称：《中国科学院地质与地球物理研究所2003学术年会》

会议日期：2003年

学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学] 

基　　金：Supported by the National Natural Science Foundation of China(Grant Nos.49973008 and 40172015) the Chinese Academy of Sciences (Grant No.KZCX2-116) 

关 键 词：Neoproterozoic southern China sulfur isotopes carbon isotopes seawater secular variations 

摘      要：A new set of δS,δSand δCvalues has been reported from Neoproterozoic sedimentary rocks in southern *** interglacial black shales of the Datangpo *** higherδSvalues with+20‰average,but the postglacial black shales from the Doushantuo *** negativeδ***,the Jinjiadong Fm.,the same post-glaciation as the Doushantuo Fm.,has positiveδSvalues,implying that theδS value of sedimentary sulfides would be controlled by lithofacies and paleogeographic ***δSvalues relative toδCwere obtained by extraction of trace sulfate from the successive carbonate sequences in the Yangtze Gorges sections.A preliminary interpretation suggests that the oceanic environment may fluctuate dramatically at the post-glacial Doushantuo stage and,then,recover its stability at the Dengying stage on the basis of the high resolutionδS andδC curves of seawater.