华南Pc-C过渡期深水相剖面的碳、氧同位素记录  

Carbon and Oxygen Isotopic Records from the Deep-Water Facies Sections of the Precambrian-Cambrian Transitional Period

作　　者：潘家永[1,2] 马东升[1] 曹双林[1,2] 夏菲[1,2] 陈少华[2] 吴凯[1] 

机构地区：[1]南京大学内生金属矿床成矿机制研究国家重点实验室,江苏南京210093 [2]东华理工学院,江西抚州344000

出　　处：《地球学报》2005年第B09期182-185,共4页Acta Geoscientica Sinica

基　　金：本文由国家自然科学基金项目（批准号：40272080与40232020）和973项目（编号：G1999043210）共同资助.

摘　　要：本文对湘西三岔、杆子坪与贵州织金3个震旦纪—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δ^13C负漂移。其δ^13C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δ^13C负漂移。Carbon and oxygen isotopic records from three deep-water facies 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 δ^13C anomalies at the bottom of Early Cambrian strata in the three deep-water facies sections, whose characteristics are similar to those of shallow- water facies sections all over the world. The negative δ^13C shift at the bottom of Early Cambrian might have been caused by decrease of bio-productivity.

关 键 词：碳同位素 深水相 黑色岩系 华南 海相碳酸盐 氧同位素记录 剖面 Δ^13C 过渡 下寒武统 

分 类 号：P534.41[天文地球—古生物学与地层学] P532[天文地球—地质学]