The effects of volcanism on the Permo-Triassic mass extinction in South China
The effects of volcanism on the Permo-Triassic mass extinction in South China
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DOI：
10.1017/cbo9780511529498.014
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发表时间：
1992-02
影响因子：
6.5
通讯作者：
Yin Hongfu;Huang Siji;Zhang Kexing;H. Hansen;Yang Feng-qing;Ding Meihua;Bi Xianmei;W. C. Sweet;Yang Zunyi;J. Dickins
中科院分区：
文献类型：
--
作者：
Yin Hongfu;Huang Siji;Zhang Kexing;H. Hansen;Yang Feng-qing;Ding Meihua;Bi Xianmei;W. C. Sweet;Yang Zunyi;J. Dickins
在这一章中，我们主要讨论华南二叠纪-三叠纪界线的火山作用，并简要介绍特提斯域的其他地区。在华南大部分地区，通常被认为是二叠-三叠系边界的层面以所谓的“边界粘土岩”为标志，它是一层几厘米到几分米厚的蒙脱石或间层蒙脱石和伊利石。边界粘土岩是海相的，因为它产出牙形刺、介形虫、有孔虫和灰榴石，而且它的硼含量到处都远高于100 ppm。在边界粘土岩的水平上，记录了二叠纪-三叠纪大灭绝的最强阶段，也是在这个水平上，813 C，铱和其他元素的异常浓度被报道。
In this chapter we deal mainly with volcanism in the Permo-Triassic boundary interval in South China, with brief reference to other parts of the Tethyan realm. In much of South China a level commonly regarded as the Permo-Triassic boundary is marked by the so-called'boundary clayrock', which is a layer of montmorillonite or interstratified montmorillonite and illite several centimeters to a few decimeters thick. The boundary clayrock is marine because it yields conodonts, ostracodes, foraminifera, and glauconite, and because its boron content is everywhere much higher than 100 ppm. It is at the level of the boundary clayrock that the strongest phase of Permo-Triassic mass extinction is recorded and it is also at this level that anomalous concentrations of 813C, iridium, and other elements have been reported.