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Marine Mo biogeochemistry in the context of dynamically euxinic mid-depth waters: A case study of the lower Cambrian Niutitang shales, South China

文献类型：期刊论文

作者Cheng, Meng1,2; Li, Chao1; Zhou, Lian3; Algeo, Thomas J.1,3,4; Zhang, Feifei5; Romaniello, Stephen5; Jin, Cheng-Sheng1; Lei, Li-Dan1; Feng, Lian-Jun6; Jiang, Shao-Yong3,7
刊名GEOCHIMICA ET COSMOCHIMICA ACTA
出版日期2016-06-15
卷号183页码:79-93
关键词Mo isotope Nanhua Basin Fe-Mn shuttle Niutitang Formation Early Cambrian
DOI10.1016/j.gca.2016.03.035
文献子类Article
英文摘要Molybdenum (Mo) concentrations and Mo isotopes have been widely used as proxies for local and global redox conditions in early oceans (>520 Ma) that were stratified and characterized by dynamically euxinic mid-depth waters. However, the nature of the Mo cycle and accompanying isotopic fractionations in such oceans remain poorly known. To fill this gap, we conducted an integrated study of Mo isotopes and redox-sensitive trace element (RSTE) abundances in the Lower Cambrian Niutitang Formation at Yangjiaping, South China. This section accumulated on the northern shelf margin of the Nanhua Basin, a failed intracontinental rift basin with a good connection to the open ocean during the early Cambrian. The Niutitang Formation contains a similar to 18-m-thick lower black shale member, and a similar to 56-m-thick upper gray silty shale member. The lower member (LM) is moderately to strongly enriched in Mo, U and V, and heterogeneous in Mo isotopic composition (delta Mo-98 = -0.65% to +2.14%), indicative of dominantly euxinic depositional conditions punctuated by ferruginous episodes (as shown by previously reported Fe speciation data). The upper member (UM) shows lesser enrichment of Mo, U and V, higher Mo/U ratios, and intermediate and more uniform Mo-isotopic compositions (delta Mo-98 = +1.16% to +1.71%), indicative of weakly oxic to anoxic-euxinic depositional conditions. Geochemical profiles suggest that the LM-to-UM transition reflects a shift of the O-2/H2S chemocline from the water column to the sediment. Large delta Mo-98 fluctuations in the LM may record variations of H2S concentrations in the mid-depth euxinic waters. The intermediate and relatively uniform delta Mo-98 values of the UM are attributed to the effects of a local Fe-Mn particulate shuttle.
WOS关键词MOLYBDENUM ISOTOPE FRACTIONATION ; YANGTZE PLATFORM ; BLACK SHALES ; REDOX CONDITIONS ; FERRUGINOUS CONDITIONS ; TRACE-METALS ; RE-OS ; SULFATE CONCENTRATIONS ; XIAOTAN SECTION ; BIOGENIC SULFUR
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000376168000006
资助机构Chinese 973 program(2013CB955704) ; Chinese 973 program(2013CB955704) ; Chinese 111 Project(B08030) ; Chinese 111 Project(B08030) ; Sedimentary Geology and Paleobiology program of the U.S. National Science Foundation ; Sedimentary Geology and Paleobiology program of the U.S. National Science Foundation ; NASA Exobiology program ; NASA Exobiology program ; China University of Geosciences, Wuhan(GPMR201301 ; China University of Geosciences, Wuhan(GPMR201301 ; NSFC(41273005 ; NSFC(41273005 ; BGL201407) ; BGL201407) ; 41473007 ; 41473007 ; 41230102 ; 41230102 ; 41172030) ; 41172030) ; Chinese 973 program(2013CB955704) ; Chinese 973 program(2013CB955704) ; Chinese 111 Project(B08030) ; Chinese 111 Project(B08030) ; Sedimentary Geology and Paleobiology program of the U.S. National Science Foundation ; Sedimentary Geology and Paleobiology program of the U.S. National Science Foundation ; NASA Exobiology program ; NASA Exobiology program ; China University of Geosciences, Wuhan(GPMR201301 ; China University of Geosciences, Wuhan(GPMR201301 ; NSFC(41273005 ; NSFC(41273005 ; BGL201407) ; BGL201407) ; 41473007 ; 41473007 ; 41230102 ; 41230102 ; 41172030) ; 41172030)
源URL[http://ir.iggcas.ac.cn/handle/132A11/53522]  
专题地质与地球物理研究所_科技支撑系统
作者单位1.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China
2.China Univ Geosci, Sch Earth Sci, Wuhan 430074, Peoples R China
3.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
4.Univ Cincinnati, Dept Geol, Cincinnati, OH 45221 USA
5.Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA
6.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
7.Nanjing Univ, Dept Earth Sci, State Key Lab Mineral Deposits Res, Nanjing 210093, Jiangsu, Peoples R China
推荐引用方式
GB/T 7714		 Cheng, Meng,Li, Chao,Zhou, Lian,et al. Marine Mo biogeochemistry in the context of dynamically euxinic mid-depth waters: A case study of the lower Cambrian Niutitang shales, South China[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2016,183:79-93.
APA Cheng, Meng.,Li, Chao.,Zhou, Lian.,Algeo, Thomas J..,Zhang, Feifei.,...&Jiang, Shao-Yong.(2016).Marine Mo biogeochemistry in the context of dynamically euxinic mid-depth waters: A case study of the lower Cambrian Niutitang shales, South China.GEOCHIMICA ET COSMOCHIMICA ACTA,183,79-93.
MLA Cheng, Meng,et al."Marine Mo biogeochemistry in the context of dynamically euxinic mid-depth waters: A case study of the lower Cambrian Niutitang shales, South China".GEOCHIMICA ET COSMOCHIMICA ACTA 183(2016):79-93.

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