孙康,胡永亮,关成国,孙云鹏,王伟,高云鹏

• 1:山东科技大学地球科学与工程学院
• 2:中国科学院南京地质古生物研究所和生物演化与环境卓越创新中心现代古生物学和地层学国家重点实验室

摘要(Abstract)：

埃迪卡拉纪普遍缺乏有效的同位素年龄和生物地层资料,碳同位素(δ~(13)C_(carb))常用来作为其内部地层划分与对比的标准。目前,关于埃迪卡拉纪扬子地台δ~(13)C_(carb)地层的研究多集中在中上扬子区,扬子地台东缘下扬子区的研究则较少。本文详细分析了扬子地台下扬子区邵家山剖面地层序列和δ~(13)C_(carb)特征,发现邵家山剖面以碳酸盐岩为主,为该时期典型的浅水相沉积;δ~(13)C_(carb)值分布范围为–2.6‰～5.7‰,均值为0.9‰±0.3‰。剖面的下部、中下部、中上部以及上部的δ~(13)C_(carb)负漂移幅度分别为1.6‰、4.1‰、7.6‰和3.2‰,可分别对应峡东地区的EN1/CANCE、EN2/BAINCE、EN3/DOUNCE和EN4/BACE。对比分析扬子地台典型的8个浅水相剖面发现:盖帽白云岩广泛发育EN1/CANCE,δ~(13)C_(carb)分布在–6‰～0‰之间;EN3/DOUNCE在各剖面均有发育,漂移幅度均大于4‰,最大可达15.6‰; EN2/BAINCE仅在峡东地区的剖面发育,漂移幅度可达8.2‰; EN4/BACE在大多数剖面发育,漂移幅度为1.2‰～8.7‰。其中, EN4/BACE可作为广泛采用的埃迪卡拉系—寒武系界线的划分依据,而EN1/CANCE和EN3/DOUNCE可作为扬子地台埃迪卡拉系内部地层划分对比的重要标志。

关键词(KeyWords)： 埃迪卡拉纪;扬子地台东缘;浅水相;碳同位素(δ~(13)C_(carb));邵家山剖面;浙西

Abstract:

Keywords:

基金项目(Foundation): 中国科学院战略性先导科技专项(B类)(XDB18000000、XDB26000000、XDB10010101);; 国家自然科学基金联合基金(U1562104);; 国家重点研究开发计划(2017YFC0603101);; 国家科技重大专项(2017ZX05036-001-004)共同资助

作者(Author): 孙康,胡永亮,关成国,孙云鹏,王伟,高云鹏

DOI: 10.19839/j.cnki.dcxzz.2020.0017

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