Abstract
Carbon and oxygen isotope records for Shangsi Section in Northwest Sichuan Basin, South China can help investigating depositional environments and processes, including the burial rate and possible contribution of hydrothermal events. Samples from the lower Chihsian Formation show δ13CPDB and δ18OPDB values close to those of typical marine limestone. However, the overlying Permian middle-upper Chihsian, Wujiaping, and Maokou Formation samples reveal negative δ18OSMOW values and strong positive δ13CPDB values. These indicate high biological productivity and rapid burial of organic carbon. Samples from the Dalong Formation present both negative δ13CPDB and negative δ18OPDB values, which are quite different from the underlying Permian strata. These abnormal carbon and oxygen isotope characteristics in the Dalong Formation may suggest that hydrothermal processes contributed to deposition.
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Chen, H., Xie, X., Mao, K. et al. Carbon and oxygen isotopes suggesting deep-water basin deposition associated with hydrothermal events (Shangsi Section, Northwest Sichuan Basin-South China). Chin. J. Geochem. 33, 77–85 (2014). https://doi.org/10.1007/s11631-014-0661-7
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DOI: https://doi.org/10.1007/s11631-014-0661-7