Response of Carnian Pluvial Episode evidenced by organic carbon isotopic excursions from western Hubei,South China |
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| Institution: | 1. State Key Laboratory of Palaeobiology and Stratigraphy, and Center for Excellence in Life and Paleoenvironment, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Department of Geology, Earth Surface Research Laboratory (ESRL), and Irish Centre for Research in Applied Geosciences (iCRAG), Trinity College Dublin, The University of Dublin, Dublin, Ireland;4. College of Geography and Tourism, Qufu Normal University, Rizhao 276826, China |
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| Abstract: | We here report a high-resolution organic C-isotope record from terrestrial–marine transitional sediments of the Badong Formation in the Luojiagou section, Zigui Basin of Hubei Province, South China. Our organic carbon isotope (δ13Corg) profile, ranging from -21.2‰ to -26.2‰, shows four negative carbon-isotope shifts. We suggest that the sharpest negative carbon isotope excursion in the upper portion of the Badong Formation marks the main phase of the Carnian Pluvial Episode (CPE) in the basin, likely correlated with those in other depositional records of this time. The occurrence of the CPE in the Badong Formation would imply that the stratigraphic coverage of the Badong Formation might be prolonged to incorporate (at least part of) the Late Triassic Carnian stage. This result provides a potential case for understanding the CPE in continental–marine environments in the eastern Tethys realm, and is significant for exploring the palaeoclimate variation across the Late Triassic. |
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| Keywords: | Carnian Pluvial Episode Triassic Zigui Basin Organic carbon isotopes Badong Formation Terrestrial–marine transitional sediments |
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