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Evolution of oceanic molybdenum and uranium reservoir size around the Ediacaran–Cambrian transition: Evidence from western Zhejiang, South China
Lei Xiang (向雷)1,2; Shane D. Schoepfer3; Shu-zhong Shen (沈树忠)1,2; Chang-qun Cao (曹长群)1; Hua Zhang (张华)1
2017
Source PublicationEarth and Planetary Science Letters
ISSN0012-821X
Volume464Pages:84-94
Abstract

The "Cambrian explosion" is one of the most fascinating episodes of diversification in the history of life; however, its relationship to the oxygenation of the oceans and atmosphere around the Ediacaran-Cambrian transition is not fully understood. Marine inventories of redox-sensitive trace elements reflect the relative balance of oxidative weathering on land and deposition in anoxic water masses, and can be used to explore the evolution of oceanic and atmospheric redox conditions. For this study, we conducted a series of geochemical analyses on the upper Lantian, Piyuancun, and Hetang formations in the Chunye-1 well, part of the lower Yangtze Block in western Zhejiang. Iron speciation results indicate that the entire studied interval was deposited under anoxic conditions, with three intervals of persistent euxinia occurring in the uppermost Lantian Fm., the lower Hetang Formation (Fm.), and the upper Hetang Fm. Molybdenum (Mo) and uranium (U) contents and Mo/TOC and U/TOC ratios from the anoxic/euxinic intervals of the Chunye-1 well, combined with published data from the sections in the middle and upper Yangtze Block, suggest that the oceanic Mo reservoir declined consistently from the Ediacaran to Cambrian Stage 3, while the size of the oceanic U reservoir remained relatively constant. Both metals were depleted in the ocean in lower Cambrian Stage 4, before increasing markedly at the end of Stage 4. The lack of an apparent increase in the size of the marine Mo and U reservoir from the upper Ediacaran to Cambrian Stage 3 suggests that oxic water masses did not expand until Cambrian Stage 4. The increase in marine Mo and U availability in the upper Hetang Fm. may have been due to the expansion of oxic water masses in the oceans, associated with oxygenation of the atmosphere during Cambrian Stage 4. This expansion of oxic waters in the global ocean postdates the main phase of Cambrian diversification, suggesting that pervasive oxygenation of the ocean on a large scale was not the primary control on animal diversity following the Ediacaran-Cambrian transition. (C) 2017 Elsevier B.V. All rights reserved.

KeywordHetang Formation Iron Speciation Euxinia Oceanic Mo Reservoir Oceanic u Reservoir Cambrian Explosion
DOI10.1016/j.epsl.2017.02.012
Indexed BySCI
Language英语
WOS KeywordOrganic-carbon Isotope ; Permian Mass Extinction ; Ferruginous Deep-water ; Yangtze Platform ; Black Shales ; Proterozoic Ocean ; Laobao Formation ; Iron Speciation ; Oxygenation ; Constraints
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000395923500008
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/13129
Collection中国科学院南京地质古生物研究所
中国科学院南京地质古生物研究所
其他
Affiliation1.Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, 39 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
2.Nanjing Univ, Ctr Res & Educ Biol Evolut & Environm, 163 Xianlin Ave, Nanjing 210023, Jiangsu, Peoples R China
3.Univ Calgary, Dept Geosci, 2500 Univ Dr NW, Calgary, AB T2N 1N4, Canada
First Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Recommended Citation
GB/T 7714
Lei Xiang (向雷),Shane D. Schoepfer,Shu-zhong Shen (沈树忠),等. Evolution of oceanic molybdenum and uranium reservoir size around the Ediacaran–Cambrian transition: Evidence from western Zhejiang, South China[J]. Earth and Planetary Science Letters,2017,464:84-94.
APA Lei Xiang ,Shane D. Schoepfer,Shu-zhong Shen ,Chang-qun Cao ,&Hua Zhang .(2017).Evolution of oceanic molybdenum and uranium reservoir size around the Ediacaran–Cambrian transition: Evidence from western Zhejiang, South China.Earth and Planetary Science Letters,464,84-94.
MLA Lei Xiang ,et al."Evolution of oceanic molybdenum and uranium reservoir size around the Ediacaran–Cambrian transition: Evidence from western Zhejiang, South China".Earth and Planetary Science Letters 464(2017):84-94.
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