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首页> 外文期刊>Journal of Asian earth sciences >Conodont biostratigraphy across the Permian-Triassic boundary at the Dawen section, Great Bank of Guizhou, Guizhou Province, South China: Implications for the Late Permian extinction and correlation with Meishan
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Conodont biostratigraphy across the Permian-Triassic boundary at the Dawen section, Great Bank of Guizhou, Guizhou Province, South China: Implications for the Late Permian extinction and correlation with Meishan

机译：中国南方贵州省贵州大银行大汶段二叠系-三叠纪界线的牙形质生物地层：对晚二叠纪灭绝的影响及其与眉山的关系

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摘要

Several continuous Permian-Triassic boundary (PTB) sections are well exposed in the interior of the Great Bank of Guizhou (GBG) on the east limb of the Bianyang syncline, Luodian County, Guizhou Province, South China. Fourteen conodont taxa are identified, including Clarkina kazi, Clarkina lehrmanni n. sp., Clarkina taylorae, Clarkina zhejiangensis, Hindeodus eurypyge, Hindeodus inflatus, Hindeodus sxlatidentatus, Hindeodus parvus erectus, Hindeodus parvus parvus, Hindeodus postparvus, Hindeodus praeparvus, Hindeodus typicalis, Isarcicella staeschei, and Merrillina ultima based on a detailed study of the Permian-Triassic interval at the Dawen section. The first occurrence (FO) of H. parvus parvus in the lower Daye Formation, at about 7.45 m above the contact surface between the Upper Permian skeletal packstone and a calcim-icrobial framestone unit, is correlated with the Permian-Triassic boundary; the occurrence of H. eurypyge, H. praeparvus and M. ultima immediately below and H. postparvus above the interval supports this interpretation. A morphometric analysis of 31 Hindeodus specimens helped distinguish H. parvus erectus from H. parvus parvus and H. postparvus. Correlation with the Meishan section (PTB GSSP) using both conodont biostratigraphy and carbon isotopes, indicates that the major extinction at the two localities is simultaneous and coincides with the top of the skeletal packstone at Dawen. The contact between the skeletal packstone and the calcimicrobialite is very irregular and has previously been interpreted as a dissolution surface and correlated with a surface in the lower part of bed 27 at Meishan. Our results confirm this interpretation and reveal that the dissolution event postdated the extinction.
机译：在中国南部贵州省罗甸县边阳向斜线东肢的贵州大银行内部，几个连续的二叠纪-三叠纪边界（PTB）断面暴露得很好。确定了14个牙形生物分类群，包括Clarkina kazi，Clarkina lehrmanni n。 sp。，克拉克丽娜·泰勒罗，克拉克丽娜·浙江，Hindodus eurypyge，Hindodus inflatus，Hindodods sxlatidentatus，Hindodods parvus erectus，Hindodods parvus parvus，Hindodus postparvus，Hindodusc praeparvus，详细的Hindodeodus perisella，典型的Hindoleodus Andisella，I。大汶段的三叠纪间隔。在上二叠系骨骼堆积石与钙钙-三叠系骨架石单元接触面以上约7.45 m处，大耶下部低层H. parvus parvus的首次出现（FO）与二叠系-三叠纪界线相关。间隔以下的H. eurypyge，H。praeparvus和U. ultima以及间隔以上的H. postparvus的发生都支持这种解释。对31个Hindeodus标本进行形态计量学分析有助于区分直立人小球菌和小后人小球菌和小后人球菌。使用牙形生物地层学和碳同位素与梅山剖面（PTB GSSP）的相关性表明，这两个地方的主要灭绝是同时发生的，并且与大汶地区的骨骼堆积岩顶部重合。骨骼堆积石和钙微辉石岩之间的接触非常不规则，以前被解释为溶蚀表面，并且与眉山床27下部的表面相关。我们的结果证实了这种解释，并揭示了溶解事件早于灭绝事件。

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