地质论评2011，Vol.57Issue(1)：16-23,8.
塔里木盆地蓬莱坝剖面寒武系第二统-第三统界线处碳同位素负异常及其地质意义
Negative Carbon Isotope Excursion on the Cambrian Series 2-Series 3 Boundary for Penglaiba Section in Tarim Basin and Its Significances
摘要
Abstract
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％0 and 0. 8％0, while the δ18 O values (V-PDB) vary between -7.4％0 and -3.8％0. Moreover, there is no obvious correlation between the δ13C and δ18 O values, indicating the δ13C values recorded a memory of ancient seawater chemistry. A large negative δ13C excursion up to -4.2％0 at the boundary between the Wusongger and Shayilik formations characterize the Cambrian Series 2-Series 3 boundary. This negative δ13C excursion could be correlated with the ROECE events reported for Laurentia, Siberia, North China and South China. As ROECE happened at approximately 509 Ma, our report offers a reliable age for the Cambrian strata in the Tarim Basin. This work is also the first report of ROECE excursion in the Tarim Basin, and highlights the great potential of δ13C variation in Cambrian subdivision and global correlation.关键词
寒武系第二统-第三统/碳同位素/负漂移/蓬莱坝剖面/柯坪地区/塔里木盆地Key words
Cambrian Series 2-Series 3/ carbon isotope/ negative excursion/ Penglaiba section/ Kalpin area, Tarim Basin引用本文复制引用
王小林,胡文瑄 ,李庆,朱井泉..塔里木盆地蓬莱坝剖面寒武系第二统-第三统界线处碳同位素负异常及其地质意义[J].地质论评,2011,57(1):16-23,8.基金项目
本文为国家科技重大专项(编号2008ZX05005-002-007HZ)的成果. （编号2008ZX05005-002-007HZ）
