赵晓逸,房强,吴怀春,王训练

• 1:中国地质大学(北京)海洋学院
• 2:中国地质大学(北京)生物地质与环境地质国家重点实验室
• 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:中国地质大学(北京)地球科学与资源学院

摘要(Abstract)：

中二叠世卡匹敦期发生了两次碳同位素漂移事件,但由于缺乏高精度年代学的约束,其发生机制目前尚存争议。本研究对四川宣汉渡口剖面茅口组共62个碳酸盐岩样品进行无机碳同位素分析,识别出卡匹敦早期的"Kamura"正漂移事件和卡匹敦晚期的负漂移事件,并将其与华南同期事件进行对比。通过剖面已建立的万年级"浮动"天文年代标尺的约束,将发生于Jinogondolella postserrata牙形石带中"Kamura事件"的两个δ~(13)C_(carb)尖峰持续时间确定为～28万年,第一个尖峰与地轴斜率高振幅期间导致的海洋高生产力相关,第二个尖峰或与峨眉山火山活动致使的海洋缺氧事件相关。J. xuanhanensis牙形石带中的δ~(13)C_(carb)负漂移事件发生于"Kamura事件"第二个尖峰后的83万年,持续时间较长(～115万年),速率较慢(～0.07‰/万年),推测此次事件可能是由全球海平面缓慢下降导致,或与火山活动导致的二氧化碳和甲烷等气体大量释放无关。

关键词(KeyWords)： Kamura事件;地层对比;旋回地层;成因机制;宣汉渡口剖面;四川

Abstract:

Keywords:

基金项目(Foundation): 现代古生物学和地层学国家重点实验室(中国科学院南京地质古生物研究所)开放基金(183107);; 国家自然科学基金(41925010、41790451);; 国家重点研发专项(2019YFC0605400);; “111计划”项目(B20011)共同资助

作者(Author): 赵晓逸,房强,吴怀春,王训练

DOI: 10.19839/j.cnki.dcxzz.2020.0032

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