李光金,王霄鹏,孙云鹏,庞科,万斌,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:中国科学院大学
• 3:中国科学技术大学

摘要(Abstract)：

淮南地区中—新元古代地层保存有大量精美的宏体碳质压膜化石和有机质壁微体化石,是新元古代大冰期之前生命演化的重要实证材料。然而,淮南地区中—新元古代地层的沉积时间仍未得到较好的约束,碎屑锆石年龄随地层层序的变化特征也未明确。为此本文对碎屑锆石数据较少的淮南寿县地区中—新元古代地层开展了系统的碎屑锆石U-Pb同位素测年。结果显示,八公山组碎屑锆石以古元古代锆石为主体,无小于1600 Ma的锆石;刘老碑组和寿县组碎屑锆石以中元古代锆石为主体,中元古代之前的锆石较少。综合已知的碎屑锆石年龄以及与邻区地层的对比,约束寿县组沉积时间为～950—～945 Ma,刘老碑组沉积时间为～1110—～945 Ma。淮南与鲁西地区中—新元古代地层的碎屑锆石年龄谱、沉积序列、沉积环境和化石产出相似,两地地层可相互对比。淮南地区中元古代早期及之前的碎屑锆石源区可能在华北克拉通东部,而中元古代晚期的碎屑锆石的源区则可能不在华北克拉通。

关键词(KeyWords)： 华北克拉通;淮南;中—新元古代;碎屑锆石;U-Pb年龄

Abstract:

Keywords:

基金项目(Foundation): 中国科学院战略性先导科技专项B类(XDB18000000);中国科学院青年创新促进会(2021307)共同资助;; 国家自然科学基金(41921002);; 现代古生物学和地层学国家重点实验室(20201102)

作者(Author): 李光金,王霄鹏,孙云鹏,庞科,万斌,周传明

DOI: 10.19839/j.cnki.dcxzz.2021.0017

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