Carbon isotope negative excursions across the Triassic-Jurassic boundary interval in the Tibetan Himalayas

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外文摘要：Fossils from sections at Germig in the Tibetan Himalayas allow the establishment of ammonoid assemblages ranging from uppermost Triassic to basal Jurassic。 The carbon isotope profile from these sections shows a majority of positive values in the Rhaetian， and negative values within the Hettangian intervals。 Pronounced negative excursions between the Triassic and Jurassic boundary corresponds to the end-Triassic extinction。 A stepwise pattern of the end-Triassic extinction is demonstrated by the bivalves and ammonoids。 However， the warm episode persisting throughout from late Triassic to basal Hettangian in the Tibetan Himalayas， indicated by subtropic and tropic forms remains to be interpreted。

外文关键词：

triassic-jurassic boundarytibetan himalayasammonoidsbivalvescarbon isotopes

作者：

YIN Jiarun、CAI Huawei、ZHANG Yiyi

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作者单位：

China University of Geosciences, Beijing 100083, China

会议名称：

Progress in Natural Science vol.16(Special Issue), June 2006: Marine and Non-Marine Jurassic: Boundary Events and Correlation

会议地点：

Nanjing(CN)

会议母体文献：

International Symposium on the Jurassic Boundary Events and the Annual Symposium of the International Geoscience Program IGCP 506: Marine and Non-Marine Jurassic; 20051101-04; Nanjing(CN)

页码：

P.23-30

出版时间：

2005