Chemostratigraphy of the Ediacaran basinal setting on the Yangtze platform, South China: Oceanographic and diagenetic aspects of the carbon isotopic depth gradient

doi:10.1111/iar.12196

	Chemostratigraphy of the Ediacaran basinal setting on the Yangtze platform, South China: Oceanographic and diagenetic aspects of the carbon isotopic depth gradient
	Furuyama, S (Furuyama, Seishiro); Kano, A (Kano, Akihiro); Kunimitsu, Y (Kunimitsu, Yoko); Ishikawa, T (Ishikawa, Tsuyoshi); Wang, W (王伟); Liu, XC (刘欣春)
	2017
发表期刊	Island Arc
ISSN	1038-4871
卷号	26 期号:5 页码:e12196
摘要	The Ediacaran Yangtze platform in South China, which represents depositional settings ranging from coastal to basinal, provides valuable information for understanding climate changes and animal evolution during the Ediacaran Period. Although the shallower settings have been investigated, research on the basinal sections has been limited. This has hampered efforts to establish stratigraphic correlations and understand the oceanographic setting of the Yangtze platform. In this paper, the chemostratigraphy of a basinal section at Fengtan, Hunan Province, is reported based on analyses of stable carbon isotope profiles in carbonates (C-13(carb)), organic matter (C-13(org)), total organic carbon, Sr-87/Sr-86 ratios, and Mn, Rb, and Sr concentrations. The basinal section of the Doushantuo Formation, which is represented at Fengtan, provides data supporting regional correlations and oceanography. Three intervals in the Doushantuo Formation are correlated with the Three Gorges: (i) a negative C-13(carb) anomaly with stable C-13(org) values and altered Sr-87/Sr-86 ratios in the lower section can be correlated to the boundary between Doushantuo Members 2 and 3 (Interval A); (ii) a relatively high C-13(carb) anomaly with unaltered Sr-87/Sr-86 ratios (up to 0.7086) in the middle section corresponding to the lower part of Doushantuo Member 3 (Interval B); and (iii) a negative C-13(carb) anomaly with lowered values in the upper section can be correlated to the long interval of negative C-13(carb) (Interval C). The Gaskiers glaciation is likely represented in Interval A, and Interval C corresponds to the Shuram excursion reported for other Ediacaran localities. Our correlations confirm the depth gradient of C-13(carb) in the Yangtze platform and imply that reductive conditions prevailed in the basinal section from the Early to Middle Ediacaran. Under such conditions, anaerobic degradation of organic carbon or methane perturbed the inorganic carbon isotopic compositions and was at least partly responsible for the depth gradient of C-13(carb).
关键词	carbon isotope chemostratigraphic correlation diagenesis Ediacaran South China strontium isotope
DOI	10.1111/iar.12196
收录类别	SCI
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000408947100001
出版者	WILEY
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/13349
专题	中国科学院南京地质古生物研究所其他
通讯作者	Furuyama, S (Furuyama, Seishiro)
推荐引用方式 GB/T 7714	Furuyama, S ,Kano, A ,Kunimitsu, Y ,et al. Chemostratigraphy of the Ediacaran basinal setting on the Yangtze platform, South China: Oceanographic and diagenetic aspects of the carbon isotopic depth gradient[J]. Island Arc,2017,26(5):e12196.
APA	Furuyama, S ,Kano, A ,Kunimitsu, Y ,Ishikawa, T ,Wang, W ,&Liu, XC .(2017).Chemostratigraphy of the Ediacaran basinal setting on the Yangtze platform, South China: Oceanographic and diagenetic aspects of the carbon isotopic depth gradient.Island Arc,26(5),e12196.
MLA	Furuyama, S ,et al."Chemostratigraphy of the Ediacaran basinal setting on the Yangtze platform, South China: Oceanographic and diagenetic aspects of the carbon isotopic depth gradient".Island Arc 26.5(2017):e12196.