史恭乐,李建国,谭覃,董重,李秋立,吴琼,章伯乐,尹素心,HERRERA Fabiany,HERENDEEN Patrick S.,CRANE Peter R.

• 1: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
• 2:中国科学院生物演化与环境卓越创新中心
• 3:中国科学院大学
• 4:中国科学院地质与地球物理研究所岩石圈演化国家重点实验室

摘要(Abstract)：

内蒙古东部霍林河盆地霍林河组是我国最重要的下白垩统含煤地层之一。该组产出大量不同种类且保存完好的植物化石,但因为缺乏海相沉积和火山岩夹层,我们对这套地层的精确年龄认知不足。我们最近在扎鲁特旗扎哈淖尔露天煤矿霍林河组发现了火山灰层,基于钻孔数据的地层分析显示该火山灰层位于霍林河组下含煤段的底部。二次离子质谱(SIMS)锆石U-Pb年代学研究得出的该火山灰层沉积年龄为125.6±1.0 Ma (巴雷姆期晚期–阿普特期最早期),这一结果与激光剥蚀-等离子体质谱(LA-ICP-MS)对同一样品分析得出的年龄一致。火山灰层保存的孢粉化石组合以裸子植物花粉和蕨类及苔藓的孢子为主,被子植物花粉非常稀少,且仅有棒纹粉Clavatipollenites一种。这一孢粉组合支持火山灰层的年龄为巴雷姆期晚期至阿普特期最早期。本研究为认识整个霍林河组的年龄及火山灰层上覆地层保存的重要植物化石的最大年龄提供了重要数据。

关键词(KeyWords)： 霍林河组;早白垩世;含煤盆地;U-Pb地质年代学;孢子花粉;内蒙古

Abstract:

Keywords:

基金项目(Foundation): supported by the Strategic Priority Research Program (B) of Chinese Academy of Sciences (XDB26000000);; the National Natural Science Foundation of China (41790454, 41802014, 41772014);; the US National Science Foundation grant DEB-1748286;; the Youth Innovation Promotion Association, CAS (2017359)~~

作者(Author): 史恭乐,李建国,谭覃,董重,李秋立,吴琼,章伯乐,尹素心,HERRERA Fabiany,HERENDEEN Patrick S.,CRANE Peter R.

DOI: 10.19839/j.cnki.dcxzz.2021.0001

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