孙云鹏,郎咸国,欧阳晴,周传明

• 1: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
• 2:中国科学技术大学
• 3:成都理工大学沉积地质研究院

摘要(Abstract)：

臼齿构造(Molar-tooth structures)在全球中—新元古代浅水碳酸盐岩地层中广泛发育,其特殊形态及矿物组成、时空分布特征及缺乏现代类比物都使其成因成为难解之谜。近年来,气体扩散-迁移模型提出的臼齿裂隙形成及微亮晶方解石的快速充填机制引起了广泛讨论。本文对安徽省宿州市沟后剖面望山组上部地层中发育的臼齿碳酸盐岩开展了岩石学和碳同位素分析。结果显示,望山组臼齿碳酸盐岩中臼齿及围岩的δ~(13)C值分布范围具有一致性,二者不具有系统性差别。中—新元古代广泛分布于浅海地区的硫化楔可能为臼齿碳酸盐岩的发育创造了条件,望山组叠层石碳酸盐岩与臼齿碳酸盐岩在地层中的交替出现可能指示二者形成时浅海水体不同的氧化还原状态。

关键词(KeyWords)： 臼齿碳酸盐岩;海水氧化还原条件;望山组;新元古界;安徽宿州

Abstract:

Keywords:

基金项目(Foundation): 中国科学院战略性先导科技专项(B类)(XDB18030303);; 国家重点研发计划项目(2017YFC0603101)共同资助

作者(Author): 孙云鹏,郎咸国,欧阳晴,周传明

DOI: 10.19839/j.cnki.dcxzz.2020.0037

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