Trace and rare earth elements geochemistry of sedimentary rocks in the Ediacaran-Cambrian transition from the Tarim Basin, Northwest China: Constraints for redox environments

doi:10.1016/j.precamres.2020.105942

	Trace and rare earth elements geochemistry of sedimentary rocks in the Ediacaran-Cambrian transition from the Tarim Basin, Northwest China: Constraints for redox environments
	Wang Liyuan 2,3; Guo Qingjun 3,4; Zhao Changqiu 3; Wei Rongfei 3; Deng Yinan 5; Han Xiaokun 1; Tian Liyan 3; Kong Jing 3; Yang Xi 3
刊名	PRECAMBRIAN RESEARCH
	2021
卷号	352 页码:12
关键词	Ediacaran-Cambrian transition Trace elements Carbonate rocks Paleoenvironment Tarim Basin
ISSN号	0301-9268
DOI	10.1016/j.precamres.2020.105942
通讯作者	Guo Qingjun(guoqj@igsnrr.ac.cn)
英文摘要	Spatiotemporal variations in the redox conditions during the Ediacaran-Cambrian (E-C) transition are closely related to the extinction of Ediacaran biota and the Cambrian explosion. However, the detailed variations in the ocean redox gradients remain a controversial issue. In this study, a large dataset of major and trace elements was obtained from the leachates of carbonate rocks sampled from three sections of the E-C transition in the Tarim Basin, northwest China. The Ce anomaly in the late Ediacaran Qigebulage Formation exhibited a regular gradient from anoxic conditions at its base to oxic conditions at its top, suggesting a gradually oxidizing environment. This could have been a beneficial factor that led to the diversification of late Ediacaran fauna. In addition, significantly negative carbon isotope excursions within the E-C boundary of the three sections studied were identified at the base of the Yuertusi Formation. This is coincident with the extinction of Ediacaran biota due to an anoxic sedimentary environment. The base of the Yuertusi Formation was deposited under anoxic or/and euxinic conditions and intense hydrothermal activity during the early Cambrian. The upper layers of this formation exhibited significant Ce anomalies following a general increase in the oxidation level, which reflected an environment transitioning from anoxic/euxinic to oxic following the early Cambrian transgression. A significantly negative delta C-13(carb) excursion was evidence of the Redlichiid-Olenellid Extinction Carbon isotopic Excursion event recorded at the boundary of the Cambrian Series 2 and Cambrian Miaolingian. From the Cambrian Series 2 Xiaoerbulak Formation to the Cambrian Miaolingian Awatage Formation, carbonate rocks were deposited in deep water conditions and an anoxic environment. Redox fluctuations could be ascribed to widespread early Cambrian transgressions and tectonic activity, such as the formation of the Tianshan Ocean during the early Cambrian, and the accompanying volcanic activity in the Tarim Basin. Marine redox fluctuations coupled with the paleontological records indicate that the increased concentration of oxygen in the water promoted evolutionary transitions and accelerated the diversification of species during the E-C transition.
资助项目	National Natural Science Foundation of China[41903007] ; National Natural Science Foundation of China[41625006] ; National Natural Science Foundation of China[41561144005] ; National Natural Science Foundation of China[41761144066] ; National Natural Science Foundation of China[41473018] ; National Natural Science Foundation of China[41603012] ; National Natural Science Foundation of China[41803026] ; Ministry of Science and Technology of China[2015FY310100] ; China Geological Survey[DD20160120-04] ; Development Services of Featured Institute of Chinese Academy of Sciences[TSYJS01] ; Education Department of Fujian Province[JT180063]
WOS关键词	YANGTZE GORGES AREA ; SOUTH CHINA ; ISOTOPE EXCURSIONS ; YURTUS FORMATION ; BLACK SHALES ; CARBON ; SEAWATER ; CERIUM ; EVOLUTION ; PLATFORM
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000600065200006
资助机构	National Natural Science Foundation of China ; Ministry of Science and Technology of China ; China Geological Survey ; Development Services of Featured Institute of Chinese Academy of Sciences ; Education Department of Fujian Province
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/137576]
专题	中国科学院地理科学与资源研究所
通讯作者	Guo Qingjun
作者单位	1.Tianjin Univ, Inst Surface Earth Syst Sci, Tianjin 300072, Peoples R China 2.Fuzhou Univ, Coll Zijin Min, Fuzhou 350108, Peoples R China 3.Chinese Acad Sci, Ctr Environm Remediat, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 4.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China 5.Guangzhou Marine Geol Survey, Guangzhou 510075, Peoples R China
推荐引用方式 GB/T 7714	Wang Liyuan,Guo Qingjun,Zhao Changqiu,et al. Trace and rare earth elements geochemistry of sedimentary rocks in the Ediacaran-Cambrian transition from the Tarim Basin, Northwest China: Constraints for redox environments[J]. PRECAMBRIAN RESEARCH,2021,352:12.
APA	Wang Liyuan.,Guo Qingjun.,Zhao Changqiu.,Wei Rongfei.,Deng Yinan.,...&Yang Xi.(2021).Trace and rare earth elements geochemistry of sedimentary rocks in the Ediacaran-Cambrian transition from the Tarim Basin, Northwest China: Constraints for redox environments.PRECAMBRIAN RESEARCH,352,12.
MLA	Wang Liyuan,et al."Trace and rare earth elements geochemistry of sedimentary rocks in the Ediacaran-Cambrian transition from the Tarim Basin, Northwest China: Constraints for redox environments".PRECAMBRIAN RESEARCH 352(2021):12.