Journal
JOURNAL OF EARTH SCIENCE
Volume 33, Issue 3, Pages 778-788Publisher
CHINA UNIV GEOSCIENCES, WUHAN
DOI: 10.1007/s12583-020-1106-3
Keywords
Early Ediacaran; delta C-13(carb) excursion; magmatism; zircon; U-Pb ages
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Funding
- National Natural Science Foundation of China [41673016]
- State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences [SKL-Z202001]
- State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences [193112]
- State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences [GPMR201902]
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In this study, a SIMS U-Pb age of ca. 620 Ma was determined from continental rift volcanism and it was found to overlap with the Weng' an negative carbonate carbon isotope excursion (WANCE). This suggests a possible causal link between volcanism-induced seafloor uplift and the occurrence of WANCE, as the uplift may have prompted the oxidation of organic carbon in oxygenated surficial oceans.
Four carbonate carbon isotope (delta C-13(carb)) excursions are recognized in the Ediacaran Doushantuo Formation in South China, the genesis of which remains disputed. Whereas three of these delta C-13(carb) 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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