New C isotope stratigraphy from southwest China: Implications for the placement of the Precambrian-Cambrian boundary on the Yangtze Platform and global correlations
Y. Shen et M. Schidlowski, New C isotope stratigraphy from southwest China: Implications for the placement of the Precambrian-Cambrian boundary on the Yangtze Platform and global correlations, GEOLOGY, 28(7), 2000, pp. 623-626
A high-resolution C isotope profile from a fossiliferous section spanning t
he Precambrian-Cambrian (PC-C) boundary on the Yangtze Platform, southwest
China, is used to constrain C isotope chemostratigraphy and its global corr
elation. The discovery of a strong negative C isotopic anomaly just below t
he China marker A indicates that this negative anomaly can be correlated gl
obally, and demonstrates that the PC-C boundary of the Chinese successions
should be close to marker A. On the basis of C isotope chemostratigraphic c
onstraints and biostratigraphic data, we rind 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 M
ongolia. By integrating the data from archaeocyaeothan fauna, the C isotopi
c peak S3 in the middle Dahai carbonates may be correlative with feature G
in the Mongolian section.