三峡地区岩家河埃迪卡拉系-寒武系界线剖面碳同位素地层学研究CARBON ISOTOPE STRATIGRAPHY OF YANJIAHE FORMATION ACROSS THE EDIACARAN-CAMBRIAN BOUNDARY IN THE AREA OF THREE GORGES
王丹,凌洪飞,李达,陈曦
摘要(Abstract)：
湖北宜昌三峡地区埃迪卡拉系-寒武系界线位置尚存争议,跨越这一界线的岩家河组地层的分段工作也缺乏统一的意见。对岩家河剖面开展岩相学和碳同位素地层学研究,揭示其碳同位素演化可与扬子板块内滇东北老林剖面和肖滩剖面对比,即自下而上在该界线附近存在一个大的δ13C负漂移、一个稍小的δ13C负漂移和一个大的δ13C正漂移。结合该剖面小壳化石首次出现的层位位于碳同位素大的负漂移之上的生物地层学证据,建议将埃迪卡拉系-寒武系界线置于δ13C大负漂移顶部和小壳化石出现层位的底部。埃迪卡拉系-寒武系界线附近的这一负漂移具有全球对比性,可作为三峡地区乃至全球范围内埃迪卡拉系-寒武系界线划分的标志之一。此外,根据碳同位素演化、岩石地层学和小壳化石资料以及与板块内滇东北地层剖面的对比,将岩家河剖面岩家河组划分为3段,它们分别相当于滇东北的朱家箐组的待补段、中谊村段和大海段。
关键词(KeyWords)： 化学地层;碳同位素;岩石地层;埃迪卡拉系-寒武系界线;岩家河组;三峡
基金项目(Foundation): 国家自然科学基金项目(No.40872025)资助
作者(Author): 王丹,凌洪飞,李达,陈曦
DOI: 10.19839/j.cnki.dcxzz.2012.01.003
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