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Volume 19 Issue 1
Feb 2008
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Jingxun Zuo, Shanchi Peng, Xuejian Zhu, Yuping Qi, Huanling Lin, Xianfeng Yang. Evolution of Carbon Isotope Composition in Potential Global Stratotype Section and Point at Luoyixi, South China, for the Base of the Unnamed Global Seventh Stage of Cambrian System. Journal of Earth Science, 2008, 19(1): 9-22.
Citation: Jingxun Zuo, Shanchi Peng, Xuejian Zhu, Yuping Qi, Huanling Lin, Xianfeng Yang. Evolution of Carbon Isotope Composition in Potential Global Stratotype Section and Point at Luoyixi, South China, for the Base of the Unnamed Global Seventh Stage of Cambrian System. Journal of Earth Science, 2008, 19(1): 9-22.

Evolution of Carbon Isotope Composition in Potential Global Stratotype Section and Point at Luoyixi, South China, for the Base of the Unnamed Global Seventh Stage of Cambrian System

Funds:

the National Natural Science Foundation of China 40672023

the National Natural Science Foundation of China 40332018

the Chinese Academy of Sciences KZCX2-YW-122

the Major Basic Research Project of MST 2006CB806400

More Information
  • Corresponding author: Zuo Jingxun: jxzuo@nigpas.ac.cn
  • Received Date: 30 Aug 2007
  • Accepted Date: 10 Nov 2007
  • This work deals with the evolution of carbon isotope composition in the Luoyixi (罗依溪) Section, a candidate of the Global Standard Stratotype-section and Point (GSSP), defining the base of the as-yet-undefined seventh stage of Cambrian System at the first appearance of the cosmopolitan agnostoid Lejopyge laevigata. This level is favored in a vote of International Subcommission on Cambrian Stratigraphy (ISCS) as the biohorizon for defining the base of a global stage. Two hundred and sixty-four samples for carbon and oxygen isotope analysis have been collected from the carbonate successions at an interval of 0.25 to 0.5 m in this section. Results of the carbon isotope data exhibit a remarkable disciplinarian trend. The pattern of the carbon isotope evolution is gently undulant with a relatively long period during the underlying Drumian Stage, and then the values of δ13C fluctuate sharply with a short period in provisional seventh stage. The onset of sharp fluctuation in the δ13C values begins at the proposed GSSP level, defining the base of the global seventh stage, where δ13C values change from a gentle trend to a sharp trend. Distinct covariant-relationships among δ13C, δ18O, and sea level fluctuations suggest that a warming change in paleoclimate took place during the early global seventh stage, which led to a positive shift in δ13C values.

     

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