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地质论评  2011 

贵州新民二叠系―三叠系界线剖面有机碳同位素变化特征及生物地球化学意义

Keywords: 有机碳同位素,二叠系―三叠系界线,疑源类及菌藻类,生物绝灭,新民剖面

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Abstract:

本文研究了贵州新民二叠系―三叠系界线剖面有机碳同位素(δ13Corg)组成和疑源类、菌藻类丰度的变化特征。δ13Corg在二叠纪末期存在缓慢降低和陡然降低两个阶段:缓慢降低发生于?Clarkinayini?带中下部,陡然降低出现在Clarkinameishanensis带内部。δ13Corg的缓慢下降与疑源类、菌藻类的丰度值保持在较低的水平相一致;δ13Corg?的陡然降低是火山活动海洋生态系的破坏以及可能存在甲烷释放等作用的结果。δ13C?org??的缓慢降低和陡然降低表明了海洋环境由渐变到突变的过程。δ13Corg?陡然降低之前出现较高值,该层位与绿硫细菌的繁盛层位相对应,说明绿硫细菌可能是造成这一较高值的主要原因。与浅水相剖面相比,新民剖面δ13Corg?在早三叠世早期仍然呈下降趋势,说明生态环境持续恶化,海洋生产率低下,生物复苏延缓。

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