Selenium isotopes trace anoxic and ferruginous seawater conditions in the Early Cambrian

doi:10.1016/j.chemgeo.2014.10.022

	Selenium isotopes trace anoxic and ferruginous seawater conditions in the Early Cambrian
	Wen, Hanjie 1; Carignan, Jean 2; Chu, Xuelei 3; Fan, Haifeng 1; Cloquet, Christophe 4; Huang, Jing 5; Zhang, Yuxu 1; Chang, Huajin 3
刊名	CHEMICAL GEOLOGY
	2014-12-18
卷号	390 页码:164-172
关键词	Se isotope Isotopic fractionation Anoxic and ferruginous sediments Cambrian Southern China
ISSN号	0009-2541
DOI	10.1016/j.chemgeo.2014.10.022
文献子类	Article
英文摘要	Selenium (Se) isotopes can yield substantial isotopic fractionation (up to 20%) confirmed by experiments and field investigations, depending on various biotic or abiotic redox transformations. Therefore, it is expected that redox changes in the ancient oceans would induce significant isotopic fractionation, and the Se isotopic signatures recorded in old sedimentary rocks might provide new insight into how the redox state of the ancient ocean has evolved. However, previous studies have shown that Se is slightly enriched in the lighter isotope relative to the bulk earth values inmost deposited conditions (oxic, anoxic, and even sulfidic). Here, our results reveal that ferruginous conditions can result in excessive accumulation of Se in sediments with an elevated Se/S ratio and significant isotope fractionation (about 6%), which leads us to propose that Se isotopes are an appropriate geochemical proxy to trace unique oceanic conditions over times. Accordingly, Se isotopic variations measured in three Early Cambrian formations in southern China suggest that anoxic waters with ferruginous conditions must have been present in early Cambrian ocean along the eastern margin of the Yangtze platform, and oceanic circulation was stepwise reorganized. This may have triggered biological diversification from the Ediacaran to the Early Cambrian. (C) 2014 Elsevier B.V. All rights reserved.
WOS关键词	MO-PGE-AU ; SOUTH CHINA ; BLACK SHALES ; DEEP-WATER ; LAOBAO FORMATION ; STABLE-ISOTOPES ; EDIACARAN OCEAN ; FRACTIONATION ; REDUCTION ; SE
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000345442400014
资助机构	973 Program(2014CB44090X4) ; 973 Program(2014CB44090X4) ; National Natural Science Foundation of China(40930425 ; National Natural Science Foundation of China(40930425 ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZZD-EW-TZ-20) ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZZD-EW-TZ-20) ; State Key Laboratory of Ore-deposit Geochemistry, Chinese Academy of Sciences(SKLODG-ZY125-07) ; State Key Laboratory of Ore-deposit Geochemistry, Chinese Academy of Sciences(SKLODG-ZY125-07) ; 41173026) ; 41173026) ; 973 Program(2014CB44090X4) ; 973 Program(2014CB44090X4) ; National Natural Science Foundation of China(40930425 ; National Natural Science Foundation of China(40930425 ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZZD-EW-TZ-20) ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZZD-EW-TZ-20) ; State Key Laboratory of Ore-deposit Geochemistry, Chinese Academy of Sciences(SKLODG-ZY125-07) ; State Key Laboratory of Ore-deposit Geochemistry, Chinese Academy of Sciences(SKLODG-ZY125-07) ; 41173026) ; 41173026) ; 973 Program(2014CB44090X4) ; 973 Program(2014CB44090X4) ; National Natural Science Foundation of China(40930425 ; National Natural Science Foundation of China(40930425 ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZZD-EW-TZ-20) ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZZD-EW-TZ-20) ; State Key Laboratory of Ore-deposit Geochemistry, Chinese Academy of Sciences(SKLODG-ZY125-07) ; State Key Laboratory of Ore-deposit Geochemistry, Chinese Academy of Sciences(SKLODG-ZY125-07) ; 41173026) ; 41173026) ; 973 Program(2014CB44090X4) ; 973 Program(2014CB44090X4) ; National Natural Science Foundation of China(40930425 ; National Natural Science Foundation of China(40930425 ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZZD-EW-TZ-20) ; CAS/SAFEA International Partnership Program for Creative Research Teams(KZZD-EW-TZ-20) ; State Key Laboratory of Ore-deposit Geochemistry, Chinese Academy of Sciences(SKLODG-ZY125-07) ; State Key Laboratory of Ore-deposit Geochemistry, Chinese Academy of Sciences(SKLODG-ZY125-07) ; 41173026) ; 41173026)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/86121]
专题	中国科学院地质与地球物理研究所
通讯作者	Wen, Hanjie
作者单位	1.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China 2.Univ Laval, Int Ctr Arctic & Subarctic Ecogeosyst Studies, CNRS UMI 3376, TAKUVIK,Ctr Etud Nordiques, Quebec City, PQ, Canada 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 4.CNRS, Ctr Rech Petrog & Geochim, F-54501 Vandoeuvre Les Nancy, France 5.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Wen, Hanjie,Carignan, Jean,Chu, Xuelei,et al. Selenium isotopes trace anoxic and ferruginous seawater conditions in the Early Cambrian[J]. CHEMICAL GEOLOGY,2014,390:164-172.
APA	Wen, Hanjie.,Carignan, Jean.,Chu, Xuelei.,Fan, Haifeng.,Cloquet, Christophe.,...&Chang, Huajin.(2014).Selenium isotopes trace anoxic and ferruginous seawater conditions in the Early Cambrian.CHEMICAL GEOLOGY,390,164-172.
MLA	Wen, Hanjie,et al."Selenium isotopes trace anoxic and ferruginous seawater conditions in the Early Cambrian".CHEMICAL GEOLOGY 390(2014):164-172.