中国东部寒武系与奥陶系界线地层的碳氧同位素研究  

Carbon and Oxygen Isotopic Study across the Cambrian Ordovician Boundary Strata in East China

作　　者：沈渭洲[1] 方一亭[1] 倪琦生[1] 刘燕 林雨萍[1] 

机构地区：[1]南京大学地球科学系

出　　处：《沉积学报》1997年第4期28-42,共15页Acta Sedimentologica Sinica

基　　金：国家自然科学基金

摘　　要：对我国东部不同地层区一些代表性的寒武系—奥陶系界线层位开展了碳、氧同位素研究。结果表明，由于沉积环境差异和成岩蚀变影响，界线层位的δ１８Ｏ值变化较大，规律性不明显，δ１３Ｃ值变化虽小，但在界线处均发生不同程度漂移。漂移的层位与寒武纪—奥陶纪主要生物群面貌变化的界线相一致。综合各方面资料分析，笔者认为。Carbon and Oxygen isotopic study of some representative Cambrian Ordovician boundary strata of various stratigraphic areas in East China has done.It was indicated that the variation of δ18O values in boundary strata is larger and the regularity of variation is not conspicuous because of the difference of sedimentary environment and the effect of diagenetic alteration.But the variation of δ18C values is small and the various degree of excursion in the boundary strata occurs.The excursive stratohorizon is consistent with the variation boundary of major biotic population.According to the study of various data,it was believed that the excurson of carbon isotopic compositions is likely attributed to the televation and subsidence of sea level from the Late Cambrian to Early Ordovician.

关 键 词：寒武系 奥陶系 碳 氧 地层界线 同位素地球化学 

分 类 号：P597[天文地球—地球化学] P534.41[天文地球—地质学]