吕苗,鞠东澍,王姝蘅,周义涵,李思彤,李志源,李光,陈波

• 1:中国科学院南京地质古生物研究所
• 2:实验技术中心
• 3:南京师范大学附属中学
• 4:山东省煤田地质局第三勘察大队

摘要(Abstract)：

晚泥盆世弗拉期-法门期(Frasnian/Famennian,以下简称F-F)之交的生物灭绝事件是显生宙以来五大生物灭绝事件之一,这次灭绝一般认为与全球海洋缺氧有关。华南广西桂林是我国F-F地层最为发育、研究程度最高的地区之一,本研究利用碳酸盐岩Ce异常指标,对桂林地区垌村剖面F-F期间的古氧化还原条件进行了重建。结果表明,F-F期间碳同位素的正漂移对应着表层海洋的氧化而非先前广泛认为的缺氧。将这一发现与先前同一地区的地球化学和古生物数据相结合并进行综合分析,我们认为气候快速波动在F-F期间生物与环境巨变中扮演了最为关键的角色。气候变冷使得海水氧溶解量增加和赤道—极地之间海水温度梯度变大,海洋表层环流和垂直翻转变得更加活跃,导致深水营养物质向海洋表层的输送量增多,有效促进表层海洋初级生产力和有机碳埋藏通量升高,进而引起全球海水碳同位素值的提高。因此,本研究支持全球气候快速变冷而非海洋缺氧导致了F-F大灭绝事件。

关键词(KeyWords)： F-F事件;气候变冷;海洋氧化;碳同位素;稀土元素;Ce异常

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(42272025);; 中国科学院南京分院—南京师范大学附中中学生“紫金”科学探究项目共同资助

作者(Author): 吕苗,鞠东澍,王姝蘅,周义涵,李思彤,李志源,李光,陈波

DOI: 10.19839/j.cnki.dcxzz.2024.0004

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