Transient deep-water oxygenation in the early Cambrian Nanhua Basin, South China
文献类型：期刊论文
| 作者 | Cheng, Meng1; Li, Chao1; Zhou, Lian2; Feng, LianJun3; Algeo, Thomas J.1,2,4; Zhang, FeiFei5; Romaniello, Stephen5; Jin, ChengSheng1; Ling, HongFei6; Jiang, ShaoYong2,6 |
| 刊名 | GEOCHIMICA ET COSMOCHIMICA ACTA
 |
| 出版日期 | 2017-08-01 |
| 卷号 | 210页码:42-58 |
| 关键词 | Mo isotope Iron speciation Trace elements Sponges Metazoan Redox |
| ISSN号 | 0016-7037 |
| DOI | 10.1016/j.gca.2017.04.032 |
| 文献子类 | Article |
| 英文摘要 | Many late Neoproterozoic to early Cambrian fossils of multicellular eukaryotes, including those of benthic animals, are found preserved under anoxic and even euxinic bottom-water conditions, which is contradictory to the consensus that oxygen is essential to eukaryotes. To investigate this conundrum, we conducted an integrated study of iron speciation, redox-sensitive trace elements, and Mo isotopes (delta Mo-98) on the black shale interval of the lower Cambrian Hetang Formation (similar to 535-521 Ma) at Lantian, South China, in which benthic sponge fossils are abundant in the lower member (LM) but absent in the upper member (UM). Iron speciation data point to uniformly anoxic-ferruginous conditions in the LM and euxinic conditions in the UM, whereas the trace-element and delta Mo-98 data show greater secular variation in redox conditions. The LM shows higher mean trace element concentrations (Mo: 108 ppm, U: 36 ppm, V: 791 ppm) and lower and more variable delta Mo-98 (+0.13 to +1.76%) relative to the UM (Mo: 45 ppm, U: 18 ppm, V: 265 ppm, delta Mo-98: +1.59 to +1.67%), and ratios of redox-sensitive trace element concentrations to total organic carbon are significantly more variable and higher on average in the LM relative to the UM. The appearance of sponge fossils and lower delta Mo-98 values correlate strongly with gray (i.e., lighter-colored) layers in the LM. These patterns can best be interpreted as recording mainly euxinic conditions throughout deposition of the study units, with more intense background euxinia in the LM relative to the UM, but also with frequent transient oxygenation events in the LM that do not appear in the UM. The transient oxygenation events of the LM led to the initial colonization of the deep Nanhua Basin by sponges, and the termination of these events in the UM caused sponge faunas to disappear until a general rise in O-2 levels later in the Cambrian permitted their return to deeper-water habitats. Our study also illustrates that multiple geochemical and paleobiological proxies exhibit different responses in 'poikiloredox' environments (i.e., characterized by small-scale spatial and high-frequency temporal variations), which can lead to apparent contradictions between metazoan fossil occurrences and their inferred watermass redox conditions. (C) 2017 Elsevier Ltd. All rights reserved. |
| WOS关键词 | MOLYBDENUM ISOTOPE FRACTIONATION ; FERRUGINOUS CONDITIONS ; EUXINIC SEDIMENTS ; PROTEROZOIC OCEAN ; YANGTZE PLATFORM ; REDOX CONDITIONS ; HETANG FORMATION ; ORGANIC-CARBON ; TRACE-METALS ; BLACK-SEA |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000405784000003 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | Chinese 973 program(2013CB955704) ; NSFC-RCUK_NERC Program(41661134048) ; NSFC(41172030 ; 111 Project(B08030) ; GPMR-CUG(GPMR201705) ; Fundamental Research Funds for Central Universities (CUG-Wuhan)(1610491T01 ; U.S. NASA Exobiology program ; 41473007 ; G1323531767) ; 41673013 ; 41230102) ; Chinese 973 program(2013CB955704) ; NSFC-RCUK_NERC Program(41661134048) ; NSFC(41172030 ; 111 Project(B08030) ; GPMR-CUG(GPMR201705) ; Fundamental Research Funds for Central Universities (CUG-Wuhan)(1610491T01 ; U.S. NASA Exobiology program ; 41473007 ; G1323531767) ; 41673013 ; 41230102) ; Chinese 973 program(2013CB955704) ; NSFC-RCUK_NERC Program(41661134048) ; NSFC(41172030 ; 111 Project(B08030) ; GPMR-CUG(GPMR201705) ; Fundamental Research Funds for Central Universities (CUG-Wuhan)(1610491T01 ; U.S. NASA Exobiology program ; 41473007 ; G1323531767) ; 41673013 ; 41230102) ; Chinese 973 program(2013CB955704) ; NSFC-RCUK_NERC Program(41661134048) ; NSFC(41172030 ; 111 Project(B08030) ; GPMR-CUG(GPMR201705) ; Fundamental Research Funds for Central Universities (CUG-Wuhan)(1610491T01 ; U.S. NASA Exobiology program ; 41473007 ; G1323531767) ; 41673013 ; 41230102) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/42965]  |
| 专题 | 地质与地球物理研究所_科技支撑系统 |
| 通讯作者 | Li, Chao |
| 作者单位 | 1.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China 2.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, 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.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. Transient deep-water oxygenation in the early Cambrian Nanhua Basin, South China[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2017,210:42-58. |
| APA | Cheng, Meng.,Li, Chao.,Zhou, Lian.,Feng, LianJun.,Algeo, Thomas J..,...&Jiang, ShaoYong.(2017).Transient deep-water oxygenation in the early Cambrian Nanhua Basin, South China.GEOCHIMICA ET COSMOCHIMICA ACTA,210,42-58. |
| MLA | Cheng, Meng,et al."Transient deep-water oxygenation in the early Cambrian Nanhua Basin, South China".GEOCHIMICA ET COSMOCHIMICA ACTA 210(2017):42-58. |
入库方式： OAI收割
来源：地质与地球物理研究所
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