韩芳,姜高磊,李莎,韦一,王嘉轩,宋博文,张克信

• 1:东华理工大学地球科学学院
• 2:中国地质科学院水文地质环境地质研究所
• 3: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
• 4:华北科技学院安全工程学院

摘要(Abstract)：

由于缺乏可靠的古生物化石及定年材料,青藏高原腹地陆相红层的时代归属一直存在很大困难。本文通过碎屑锆石U-Pb测年与微体化石分析相结合的方法,对改则盆地扪挡勒剖面红层地层序列的沉积时代进行约束。结果显示红层中上段砂岩最年轻碎屑锆石LA-ICP-MS U-Pb年龄为46±1 Ma,约束了该段地层的年龄下限。红层上段地层获得的轮藻化石2属2种(含1未定种),具有中—晚始新世的微体化石组合特征。因此,结合最年轻碎屑锆石和微体化石组合,综合研究区红层下伏美苏组和上覆那丁错组及唢呐湖组地层的时代限定,将扪挡勒剖面红层地层序列的时代限定为中—晚始新世。

关键词(KeyWords)： 改则盆地;碎屑锆石;微体化石;陆相红层;始新世

Abstract:

Keywords:

基金项目(Foundation): 中国地质调查局项目(DD20221645);; 国家自然科学基金(42171010)共同资助

作者(Author): 韩芳,姜高磊,李莎,韦一,王嘉轩,宋博文,张克信

DOI: 10.19839/j.cnki.dcxzz.2022.0019

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