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Geology; July 2000; v. 28; no. 7; p. 623-626; DOI: 10.1130/0091-7613(2000)28<623:NCISFS>2.0.CO;2
© 2000 Geological Society of America
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New C isotope stratigraphy from southwest China: Implications for the placement of the Precambrian-Cambrian boundary on the Yangtze Platform and global correlations

Yanan Shen*,1 and Manfred Schidlowski*,1

1 Max Planck Institute for Chemistry, Postfach 3060, D-55020 Mainz, Germany

A high-resolution C isotope profile from a fossiliferous section spanning the Precambrian-Cambrian (PC-C) boundary on the Yangtze Platform, southwest China, is used to constrain C isotope chemostratigraphy and its global correlation. The discovery of a strong negative C isotopic anomaly just below the China marker A indicates that this negative anomaly can be correlated globally, and demonstrates that the PC-C boundary of the Chinese successions should be close to marker A. On the basis of C isotope chemostratigraphic constraints and biostratigraphic data, we find that C isotopic peak S2, also first reported here from the Chinese successions, can be correlated with C isotopic peak I in northern Siberia and C isotope feature D in southwest Mongolia. By integrating the data from archaeocyaeothan fauna, the C isotopic peak S3 in the middle Dahai carbonates may be correlative with feature G in the Mongolian section.

Key Words: 13C/12C • chemostratigraphy • Precambrian-Cambrian boundary • Yangtze Platform




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