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

文献类型：期刊论文

作者Wen, Hanjie1; Carignan, Jean2; Chu, Xuelei3; Fan, Haifeng1; Cloquet, Christophe4; Huang, Jing5; Zhang, Yuxu1; Chang, Huajin3
刊名CHEMICAL GEOLOGY
出版日期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
DOI10.1016/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
WOS记录号WOS:000345442400014
出版者ELSEVIER SCIENCE BV
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)
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.

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来源：地质与地球物理研究所

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