【作者】 潘家永； 马东升； 曹双林； 夏菲； 陈少华； 吴凯；

【Author】 PAN Jiayong MA Dongsheng CAO Shuanglin XIA Fei CHEN Shaohua WU Kai State Key Laboratory for Mineral Deposits Research , Nanjing University, Nanjing, Jiangsu, 210093 East China Institute of Technology, Fuzhou , Jiangxi, 344000

【机构】 南京大学内生金属矿床成矿机制研究国家重点实验室； 东华理工学院；

【摘要】 本文对湘西三岔、杆子坪与贵州织金3个震旦纪一早寒武世深水相剖面进行了系统的碳氧同位素研究,研究表明,这3个剖面下寒武统底部都出现明显的δ13C负漂移。其δ13C在剖面上的变化规律与全球浅海相碳酸盐剖面相似。这可能是下寒武统海洋生物产率的降低而导致沉积碳酸盐的δ13C负漂移。更多还原

【Abstract】 Carbon and oxygen isotopic records from three deep-water fades sections (Sancha, Ganziping and Zijin) of the Precambrian-Cambrian transitional period in South China were studied in this paper. It is shown that there exist clear negative δ13C anomalies at the bottom of Early Cambrian strata in the three deep-water facies sections, whose characteristics are similar to those of shallowwater facies sections all over the world. The negative δ13C shift at the bottom of Early Cambrian might have been caused by decrease of bio-productivity.更多还原