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Lower Triassic Smithian-Spathian Boundary at West Pingdingshan Section in Chaohu, Anhui Province

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Abstract

The West Pingdingshan Section in Chaohu, Anhui Province, has been extensively studied in recent years and become one of the classic Lower Triassic sequences well-clarified in multiple stratigraphies. Also it is an important section that defines the Smithian-Spathian (S-S) boundary within the Olenekian Stage. The S-S boundary strata at the section are restudied in high-resolution conodont biostratigraphy and carbon isotopes. The refined S-S boundary defined by the FAD of conodont Neospathodus pingdingshanensis is at 30 cm above the base of Bed 52, corresponding to a rapid diversification of conodonts. A sharp positive shift of δ 13Ccarb curve co-occurs at the S-S boundary and it can be used as a key reference to define the boundary. The defined S-S boundary position and carbon isotopes curve can be well correlated globally.

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Authors and Affiliations

  1. Key Laboratory of Biogeology and Environmental Geology of the Ministry of Education (China University of Geosciences), Wuhan, 430074, China

    Dan Liang & JinNan Tong

  2. State Key Laboratory of Geological Processes and Mineral Resources (China University of Geosciences), Wuhan, 430074, China

    LaiShi Zhao

Authors
  1. Dan Liang
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  2. JinNan Tong
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  3. LaiShi Zhao
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Correspondence to JinNan Tong.

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Liang, D., Tong, J. & Zhao, L. Lower Triassic Smithian-Spathian Boundary at West Pingdingshan Section in Chaohu, Anhui Province. Sci. China Earth Sci. 54, 372–379 (2011). https://doi.org/10.1007/s11430-010-4145-2

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