薛乃华,王伟,关成国,房亚男,赵向东,张海春

• 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

摘要(Abstract)：

华南埃迪卡拉纪早期地层记录了多次碳同位素负漂移事件(例如:EN1/CANCE、WANCE、EN2/BAINCE),并产出"蓝田生物群"、"瓮安生物群"和大型带刺疑源类等化石生物群。然而由于缺乏高分辨率的年代格架,使得这些地质事件的年龄及地层对比问题长期存在争议。本研究使用自然伽马测井曲线作为古气候替代指标,对宜昌地区九龙湾岩芯陡山沱组中—下部沉积地层进行了高分辨率旋回地层学研究,发现该段约1m的沉积旋回代表405 kyr的长偏心率周期。根据长偏心率周期进行天文年代校准,并采用九龙湾岩芯陡山沱组Ⅱ段底部火山灰层的锆石TIMSU-Pb年龄(635.2±0.6Ma)作为绝对年龄锚点,得到陡山沱组Ⅱ段顶部年龄为591.4±0.6Ma,并将EN2/BAINCE结束年龄约束为约591 Ma,这远早于Gaskiers冰期发生的时间(约580 Ma)。本研究为进一步探讨陡山沱组中—下部所记录的古环境和生物演化事件提供了高分辨率年代格架。

关键词(KeyWords)： 埃迪卡拉纪;陡山沱组;华南扬子台地;旋回地层学;自然伽马测井曲线

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(41572010、41622201、41688103、42072036);; 中国科学院战略性先导科技专项(B类)(XDB18000000、XDB26000000、XDB10010101);; 中国科学院青年创新促进会、国家科技重大专项(2017ZX05036-001-004)共同资助

作者(Author): 薛乃华,王伟,关成国,房亚男,赵向东,张海春

DOI: 10.19839/j.cnki.dcxzz.2020.0031

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