Abstract
Four carbonate carbon isotope (δ13Ccarb) excursions are recognized in the Ediacaran Doushantuo Formation in South China, the genesis of which remains disputed. Whereas three of these δ13Ccarb excursions possibly record secular biogeochemical variations, the other one, namely Weng’an negative carbonate carbon isotope excursion (WANCE) with an age of ca. 620 Ma occurs mainly within the northern Yangtze Platform. In this study, a SIMS U-Pb age of ca. 620 Ma was documented from continental rift volcanism within the adjacent South Qinling terrane. Its temporal overlap with WANCE suggests a possible causal link. Volcanism-induced seafloor uplift may have prompted DOC oxidation in surficial oxygenated oceans, inducing the occurrence of WANCE.
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Acknowledgments
This study was supported by the National Natural Science Foundation of China (No. 41673016), the State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences (No. SKL-Z202001), the State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences (No. 193112), and the State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences (No. GPMR201902). The final publication is available at Springer via https://doi.org/10.1007/s12583-020-1106-3.
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Lan, Z. WANCE: A possibly Volcanism-Induced Ediacaran Carbon Isotope Excursion. J. Earth Sci. 33, 778–788 (2022). https://doi.org/10.1007/s12583-020-1106-3
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DOI: https://doi.org/10.1007/s12583-020-1106-3