Early Triassic Bivalve Biostratigraphy and Paleocommunities at Xiakou Section in Xingshan, Hubei Province
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摘要: 湖北兴山峡口剖面位于早三叠世中扬子碳酸盐缓坡较深水区域, 是我国海相二叠系-三叠系典型剖面之一.根据该剖面下三叠统大冶组地层中双壳类的垂直分布, 结合区域资料, 将该地区早三叠世早期双壳类划分为4个生物地层单位, 自下而上依次为: (1) Claraiastachei-C.griesbachi带; (2) Claraia concentrica-C.hubeiensis带; (3) Eumorphotis multiformis-E.in-aequicostata带; (4) Posidoniacircularis-P.cf.wengensis带.为了探讨生物群面貌与环境演变之间的关系, 根据双壳类的产出特征及其赋存岩石的沉积特征, 建立了3个化石群落: (1) Claraiaconcentrica-C.aurita群落; (2) Eumorphotis inaequicostata-E.multiformis群落; (3) Posidonia circularis群落.早三叠世早期双壳类群落演替, 反映了该地区早三叠世早Dienerian期海水曾一度变浅, 之后随着海侵的扩大, 水体逐渐加深.二叠纪末生物大灭绝后海洋环境动荡, 可能是早三叠世海洋生态系复苏过程延长的重要原因.Abstract: According to the vertical distribution of bivalves in the Lower Triassic Daye Formation at the Xiakou Section in Xingshan, Hubei Province, four bivalve biostratigraphic zones are recognized in ascending order: Claraia stachei-C.griesbachi Zone, Claraia concentrica-C.hubeiensis Zone, Eumorphotis multiformis-E.inaequicostata Zone, and Posidonia.circularis-P.cf. wengensis Zone.In addition, based on the occurrence and ecology of bivalves and their associations as well as the sedimentary facies, three communities are retrieved, i.e.Claraia concentrica-C.aurita Community, Eumorphotis inaequicostata-E.multiformis Community, and Posidonia circularis Community.The evolutionary succession of the communities indicates that the area was shallow in the early Dienerian and became deeper since then with the transgression in the Early Triassic.The turbulence of the Early Triassic environment prolongated the restoration of marine ecosystem after the end-Permian mass extinction.
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Key words:
- Early Triassic /
- bivalve /
- biostratigraphy /
- community /
- Xiakou, Xingshan County of Hubei Province
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图 1 湖北兴山峡口剖面交通位置
Fig. 1. Location map of the Xiakou Section in Xingshan, Hubei Province
图 2 峡口剖面早三叠世双壳类生物地层柱状
Fig. 2. Lower Triassic bivalve distribution and biostratigraphy at the Xiakou Section
图 4 峡口剖面早三叠世双壳类分布
Fig. 4. Distribution of the Early Triassic bivalves at the Xiakou Section
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