Negative Carbon Isotope Excursion on the Cambrian Series 2—Series 3 Boundary for Penglaiba Section in Tarim Basin and Its Significances
详细信息
- 责任者：Wang Xiaolin (School of Earth Sciences and Engineering ; State Key Laboratory for Mineral Deposits Research ; Nanjing University ; Nanjing 210093 ; China) ; Hu Wenxuan
- 刊名：Geological Review
- 出版年：2011
- 卷期：57(1)
- 关键词：寒武纪 ; Cambrian ; 地层界线 ; stratigraphic boundary ; 碳同位素 ; carbon isotopes ; 塔里木盆地 ; Tarim Basin
- 页码：p.16-23
- 图表：5 illus., 1 table, 35 refs.
- 分类号：1200
- issnNo：ISSN0371-5736
- isbnNo：CN11-1952/P
摘要
Penglaiba section of the Kalpin area,Tarim Basin, serves as a typical section for Cambrian research, whereas no detailed carbon isotopic research on the Cambrian Series 2-Series 3 boundary has been documented up to date. Carbon isotope analyses were carried out on the carbonate rocks of Cambrian Series 2 (Wusongger Formation)-Series 3 (Shayilik Formation) transition in the Penglaiba section. The δ13C values (V-PDB) vary between -4.2‰ and 0.8‰, while the δ18O values (V-PDB) vary between-7.4‰ and -3.8‰. Moreover, there is no obvious correlation between the δ13C and δ18O values, indicating the δ13C values recorded a memory of ancient seawater chemistry. A large negative δ13C excursion up to -4.2‰ at the boundary between the Wusongger and Shayilik formations characterize the Cambrian Series 2-Series 3 boundary.
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