The sulfur and carbon isotopic records in carbonates of the Dengying Formation in the Yangtze Platform, China

	The sulfur and carbon isotopic records in carbonates of the Dengying Formation in the Yangtze Platform, China
	Zhang, TG ; Chu, XL ; Zhang, QR ; Feng, LJ ; Huo, WG
刊名	ACTA PETROLOGICA SINICA
	2004-05-01
卷号	20 期号:3 页码:717-724
关键词	Yangtze Platform Dengying Formation sulfur isotope carbon isotope isotopic fractionation bacterial sulfate reduction
ISSN号	1000-0569
文献子类	Article
英文摘要	Carbonates of the Dengying Formation preserve not only carbon isotopic records,but also sulfur isotopic records of coeval seawater in the Yangtze Platform, China. The present study employs successfully a method of extracting trace sulfates from carbonate samples of the Dengying Formation collected from Yangtze Platform. The sulfur isotopic compositions of the trace sulfates were analyzed by using a rapid measuring method of S isotope ratios - an on line analytical method of EA-IRMS. In addition, the carbon and oxygen isotopic compositions of carbonates of the formation were analyzed by using the traditional measuring method of C isotope of carbonates. The ancient seawater at the Dengying stage has high delta(34)S values and delta(13)C values. Most of the delta(34)S values of the trace sulfate samples vary between +20.0parts per thousand and +38.7parts per thousand, except the lower and upper boundaries of the Dengying Formation, and the delta(13)C values of the carbonate samples of the Dengying Formation vary between +0.5parts per thousand and +5.0parts per thousand. Large negative excursion in delta(34)S and delta(13)C values of ancient seawater appear at the boundary of Precambrian-Cambrian, which is a global character of the stage and significant to stratigraphic correlation and subdivision. The isotopic characteristics of sulfur and carbon imply a high organic productivity and a high burial rate of organic carbon in the Dengying stage. It is obvious that the palaeoceanic environment in Dengying stage is correspondingly stable and highly beneficial for biology to inhabit, propagate and procreate except the two boundaries around. The trend of sulfur and carbon isotopic variations maybe attributed to the gradual oxygenation of ocean environment during the Dengying stage.
WOS关键词	NEOPROTEROZOIC SEAWATER ; EVOLUTION ; INTERVAL ; SULFATE ; OCEAN
WOS研究方向	Geology
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000222897200036
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/64259]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhang, TG
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Key Lab Mineral Resources, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Zhang, TG,Chu, XL,Zhang, QR,et al. The sulfur and carbon isotopic records in carbonates of the Dengying Formation in the Yangtze Platform, China[J]. ACTA PETROLOGICA SINICA,2004,20(3):717-724.
APA	Zhang, TG,Chu, XL,Zhang, QR,Feng, LJ,&Huo, WG.(2004).The sulfur and carbon isotopic records in carbonates of the Dengying Formation in the Yangtze Platform, China.ACTA PETROLOGICA SINICA,20(3),717-724.
MLA	Zhang, TG,et al."The sulfur and carbon isotopic records in carbonates of the Dengying Formation in the Yangtze Platform, China".ACTA PETROLOGICA SINICA 20.3(2004):717-724.