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Carbonate carbon isotope evolution of seawater across the Ediacaran-Cambrian transition: evidence from the Keping area, Tarim Basin, NW China
QINGJUN GUO;  YINAN DENG;  JIAN HU;  LIYUAN WANG
2017
Source PublicationGeological Magazine
Volume154Issue:6Pages:1244-1256
Abstract

Sedimentary rocks from the Ediacaran-Cambrian boundary record important biological, climatic and geotectonic changes during this time. To date, only few geochemical investigations on the upper Ediacaran - upper Cambrian rocks in the Tarim Basin have been carried out. Here, we report high-resolution delta C-13(carb) records from the Penglaiba, the Wushi phosphorite and the Dongergou sections from Ediacaran-Cambrian Series 3 in the Keping area of the Tarim Basin. The sections display several obvious delta C-13(carb) shifts; delta C-13(carb) values increased from 3 parts per thousand to 6.7 parts per thousand across the Qigebulage Formation. Moreover, a negative delta C-13(carb) shift across the Ediacaran-Cambrian boundary is apparent; delta C-13(carb) values decreased to a minimum of -9.8 parts per thousand in the Wushi phosphorite section (-7.7 parts per thousand in Dongergou section and -5.4 parts per thousand in Penglaiba section), followed by a positive carbonate carbon isotopic excursion across the Yuertusi Formation into the middle of the overlying Xiaoerbulak Formation. Furthermore, more or less invariable positive delta C-13(carb) values characterize the middle and upper Xiaoerbulak Formation. The most negative delta C-13(carb) value (-14.3 parts per thousand) occurred near the base of the Shayilik Formation, which is the absolute minimum value among the studied sections of the Cambrian Series 2 to Cambrian Series 3 transition in the world. The delta C-13 data from Keping, Tarim Basin are in good agreement with carbon isotope profiles recorded in South China, and these events may reflect the perturbation of the carbon cycle in the Tarim Basin during the Ediacaran-Cambrian and the Cambrian Series 2 - Cambrian Series 3 transitions.

KeywordEdiacaran–cambrian Transition Cambrian Series 2–3 Carbon Isotope Tarim China Basin Nw China
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8019
Collection环境地球化学国家重点实验室
Affiliation1.Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
2.College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
3.MLR Key Laboratory of Marine Mineral Resources, Guangzhou Marine Geological Survey, Guangzhou 510075, China
4.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang Guizhou 550002, China
5.College of Zijin Mining, Fuzhou University, Fuzhou 350116, China
Recommended Citation
GB/T 7714
QINGJUN GUO;YINAN DENG;JIAN HU;LIYUAN WANG. Carbonate carbon isotope evolution of seawater across the Ediacaran-Cambrian transition: evidence from the Keping area, Tarim Basin, NW China[J]. Geological Magazine,2017,154(6):1244-1256.
APA QINGJUN GUO;YINAN DENG;JIAN HU;LIYUAN WANG.(2017).Carbonate carbon isotope evolution of seawater across the Ediacaran-Cambrian transition: evidence from the Keping area, Tarim Basin, NW China.Geological Magazine,154(6),1244-1256.
MLA QINGJUN GUO;YINAN DENG;JIAN HU;LIYUAN WANG."Carbonate carbon isotope evolution of seawater across the Ediacaran-Cambrian transition: evidence from the Keping area, Tarim Basin, NW China".Geological Magazine 154.6(2017):1244-1256.
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