陈知,陈波

• 1:中国科学院南京地质古生物研究所实验技术中心
• 2:中国科学院南京地质古生物研究所现代古生物学和地层学国家重点实验室
• 3:中国科学院生物演化与环境卓越创新中心

摘要(Abstract)：

本文系统地统计并评估了扬子板块三峡地区埃迪卡拉纪海相碳酸盐岩的Ce/Ce~*比值,并依据能够反映原始海水信息的Ce/Ce~*数据探讨了三峡地区埃迪卡拉纪浅海海水的氧化还原性质。数据表明,埃迪卡拉纪早期陡山沱组底部盖帽碳酸盐岩没有明显的Ce异常,结合Fe组分特征,盖帽碳酸盐岩沉积期间水体主要处于铁化环境,并有间歇性的硫化,晚期有向锰化带转变的趋势。埃迪卡拉纪中期, 600—590 Ma海水可能具有弱氧化特征,590—580Ma海水氧化还原条件波动较大,575—570Ma(Shuram/DOUNCE开始阶段)Ce负异常显著,海水处于氧化环境。埃迪卡拉纪晚期,灯影组Ce负异常明显,表明该时期水体为氧化环境,可能促进了这一时期宏体多细胞动物的繁盛。海相碳酸盐岩的Ce/Ce~*比值是判别古海水氧化还原状态的重要指标,目前埃迪卡拉纪可靠的碳酸盐岩Ce/Ce~*数据还不够丰富,更多此类研究工作有待开展。

关键词(KeyWords)： 埃迪卡拉纪;Ce异常;碳酸盐岩;三峡地区;扬子板块

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(41802029)资助

作者(Author): 陈知,陈波

DOI: 10.19839/j.cnki.dcxzz.2022.0010

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