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《Chinese Journal of Geology》 1984-01
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CARBON ISOTOPE OF CARBONATE STRATA AT PERMIAN-TRIASSIC BOUNDARY IN CHANGXING,ZHEJIANG

Chen Jinshi, Shao Maorong, Huo Weiguo and Yao Yuyuan(Institute of Geology, Acadetnia Sinica, Beijing)  
Stratigraphic section of Permian-Triassic boundary of Changxing in northern Zhejiang is well-known in the world. It is characterized by successive sequence, abundant fossils and similarity of lithofacies.Changxing section is divided into two parts.The lower part belongs to Changxing Formation (Upper Permian), which consists mainly of marine limestone, about 40 m thick.Changxing Formation is underlain conformably by Longtan Formation and overlain conformably by Qinglong Formation.Qinglong Formation, the upper part of the section, belongs to Lower Triassic. It is characteristic of marlite and limestone. This part of section only exposes a thickness no much more than 10 m.38 carbonate samples are systematically collected from Changxing section and 37 pairs of carbon and oxygen isotope data are obtained from the method described by McCrea (1950). Average precision is: ±0.2‰The maximum δ13 C value in Changxing Formation is 5.1‰ , see fig 1. Magaritz and Schulzc (1982) also reported a high δ13 C (7‰) in Zechstein in Europe. Since Changxing Formation is higher than Zechstein in stratigraphic position, we can conclude that the heavier δ13 C value (≥5‰) of marine carbonate is found not only in the lower part of Upper Permian (Zechstein), but also in the upper part of Upper Permian (Changxing Formation ).In Changxing Formation, δ13 C value of marine limestone varies from 0.1‰ (at the , base of the formation), through 5.1‰ (in the middle) to 0.1‰ (at the top), i.e. δ13 C values of Changxing Formation constitute a cycle of carbon isotope variation. The variation of carbon isotopic composition of carbonate in Qinglong Formation is similar to that in Changxing Formation, however δ13C values are negative, i.e. δ13 C value varies from - 1.9‰ (at the base), through -5.0‰ to 0.3‰. So, it seems that the cycle of carbon isotope variation of marine carbonate is consistent with certain stratigraphic unit, see fig 2.The patterns of the curves of carbon isotopic composition of Changxing Formation and Qinglong Formation are similar, but different from each other by positive (Changxing) and negative (Qinglong) values and the abrupt shift in carbon isotopic composition precisely corresponding to Permian-Triassic boundary, see fig. 2.Therefore, we suggest that the δ13C value curve of marine carbonates may be used as a tool for stratigraphic classification.
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