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首页> 外文期刊>Canadian journal of earth sciences >Conodont zonation across the Permian-Triassic boundary at the Xiakou section, Yichang city, Hubei Province and its correlation with the Global Stratotype Section and Point of the PTB
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Conodont zonation across the Permian-Triassic boundary at the Xiakou section, Yichang city, Hubei Province and its correlation with the Global Stratotype Section and Point of the PTB

机译：湖北省宜昌市下口段二叠系-三叠系界线的牙形质区划及其与PTB全球地层剖面和点的相关性

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摘要

Xiakou section is situated north of the central Yangtze platform with successive Late Permian to Early Triassic strata, thicker than the Global Stratotype Section and Point (GSSP) of the Permian-Triassic boundary (PTB). We recognized three conodont zones across the PTB in this section by high-precision biostratigraphy. They are the Hindeodus latidentatus-Clarkina meishanensis Zone, Hindeodus parvus Zone, and Isarcicella isarcica Zone in ascending order, which correspond well with the GSSP. The present biostratigraphic work on Xiakou section certainly confirmed the conodont zonation through the PTB at the GSSP and also testified to the correctness of the PTB demarcation in Xiakou section. Based on this precise demarcation of the PTB, the appearance of a clay layer, bed ZSJ1266, just beneath the PTB should be an important advantage over the GSSP because this clay layer approaches to the PTB much in contrast with those two clay layers, bed 26 and bed 28, in the GSSP. Therefore, the radiometric isotopic dating in bed ZSJ1266 at Xiakou section should give a more accurate age for the PTB.
机译：下口断面位于扬子中部台地以北，具有二叠纪晚期至三叠纪早期地层，比二叠纪-三叠纪界线（PTB）的全球地层剖面和点（GSSP）厚。在本节中，我们通过高精度生物地层学认识到了整个PTB的三个牙形质带。它们分别为升序的Hindeodus latidentatus-Clarkina meishanensis带，Hindodods parvus带和Isarcicella isarcica带，与GSSP高度吻合。目前的下口断层生物地层学工作无疑证实了通过GSSP在PTB上的牙形质分区，也证明了下口断层PTB划界的正确性。基于PTB的这种精确划分，在PTB下方的ZSJ1266床层粘土层的外观应比GSSP具有重要优势，因为与这两个26层的粘土层相比，该粘土层接近PTB GSSP中的第28号床因此，下口断层床ZSJ1266的放射性同位素测年应该为PTB给出更准确的年龄。

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