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Volume 29 Issue 3
Aug 2018
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Jingxun Zuo, Shanchi Peng, Yuping Qi, Xuejian Zhu, Gabriella Bagnoli, Huaibin Fang. Carbon-Isotope Excursions Recorded in the Cambrian System, South China: Implications for Mass Extinctions and Carbon-Isotope Excursions Recorded in the Cambrian System, South China: Implications for Mass Extinctions and Sea-Level Fluctuations. Journal of Earth Science, 2018, 29(3): 479-491. doi: 10.1007/s12583-017-0963-x
Citation: Jingxun Zuo, Shanchi Peng, Yuping Qi, Xuejian Zhu, Gabriella Bagnoli, Huaibin Fang. Carbon-Isotope Excursions Recorded in the Cambrian System, South China: Implications for Mass Extinctions and Carbon-Isotope Excursions Recorded in the Cambrian System, South China: Implications for Mass Extinctions and Sea-Level Fluctuations. Journal of Earth Science, 2018, 29(3): 479-491. doi: 10.1007/s12583-017-0963-x

Carbon-Isotope Excursions Recorded in the Cambrian System, South China: Implications for Mass Extinctions and Carbon-Isotope Excursions Recorded in the Cambrian System, South China: Implications for Mass Extinctions and Sea-Level Fluctuations

doi: 10.1007/s12583-017-0963-x
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  • Corresponding author: Jingxun Zuo, jxzuo2013@sina.com
  • Received Date: 13 Jun 2017
  • Accepted Date: 15 Oct 2017
  • Publish Date: 01 Jun 2018
  • Cambrian carbonates with abundant fossils of agnostoid trilobites deposited on the southern slope (Jiangnan slope belt) of the Yangtze Platform and in the Jiangnan deepwater basin are well exposed in the Wangcun Section of western Hunan, South China, and in the Duibian A Section of western Zhejiang, southeastern China, respectively. To better understand the response of carbon- isotope excursions to depositional environment changes, mass extinctions and eustatic events, we collected 530 carbonate samples in fresh roadcut exposures of the two measured sections for analysis of carbon and oxygen isotopic compositions. Data of δ13C from the Wangcun Section, western Hunan, South China, demonstrate that the Cambrian carbon-isotope profile includes three remarkable positive excursions CPEwc-1, 2, 3 in the Upper Series 2, in the Lower and in the Middle Furongian Series. Three distinctive negative excursions CNEwc-1, 2, 3 were separately tested in the Lower Terreneuvian Series, Lower Series 3 and in the Upper Furongian Series. Similarly, in the corresponding horizons in the Duibian A Section, Zhejiang Province, southeastern China, three positive excursions CPEdb-1, 2, 3 and three negative excursions CNEdb-1, 2, 3 also have been discovered. We interpret these significant carbon-isotope excursions as being associated with enhanced biogenic productivity, mass extinctions and eustatic events.

     

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