High-resolution carbon isotope stratigraphy of the Lower and Middle Ordovician succession of the Yangtze Platform, China: Implications for global correlation

Published on 2019-12-03T09:37:51Z (GMT) by
The Lower and Middle Ordovician of the Yangtze Platform, China, is characterized by a sedimentary succession dominated by carbonate rocks. Three sections spanning the Nantsinkuan/Lunshan, Fenhsiang, Hunghuayuan, and Dawan/Zitai formations, corresponding to Tremadocian–Dapingian in age, have been sampled for high-resolution δ<sup>13</sup>C chemostratigraphy (542 samples in total). Our new δ<sup>13</sup>C data reveal five tie-points with the potential for global correlation: 1) a positive δ<sup>13</sup>C excursion in the lower Nantsinkuan Formation within the Tremadocian <i>Rossodus manitouensis</i> Zone; 2) an excursion with two peaks roughly within the late Tremadocian <i>Paltodus 'deltifer'</i> Zone; 3) a positive δ<sup>13</sup>C shift in the lower Hunghuayuan Formation, within the early Floian <i>Serratognathus diversus</i> Zone; 4) a gradual positive δ<sup>13</sup>C shift in the late Floian, ranging from the uppermost <i>S. diversus</i> Zone to the basal Oepikodus evae Zone; 5) a minor negative shift in the lower Dawan/Zitai Formation, within the early Dapingian <i>Baltoniodus triangularis</i> Zone. These excursions are herein used for correlation of the Yangtze Platform strata with successions from South China, North China, Argentine Precordillera, North America and Baltica. <p>From a palaeogeographical perspective the Gudongkou, Xiangshuidong and Daling sections represent depositional environments along an inner to outer ramp profile. δ<sup>13</sup>C data from these sections show successively heavier (higher) δ<sup>13</sup>C values with increasing depositional depth. This is interpreted as due to remineralization of organic carbon within the carbonate rocks.</p>

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Wu, Rongchang; Liu, Jianbo; Calner, Mikael; Gong, Fangyi; Lehnert, Oliver; Luan, Xiaocong; et al. (2019): High-resolution carbon isotope stratigraphy of the Lower and Middle Ordovician succession of the Yangtze Platform, China: Implications for global correlation. Geological Society of London. Collection. https://doi.org/10.6084/m9.figshare.c.4767080.v1