Highly fractionated Hg isotope evidence for dynamic euxinia in shallow waters of the Mesoproterozoic ocean
文献类型：期刊论文
| 作者 | Wu, Yaowen2,3; Tian, Hui2,3; Yin, Runsheng1; Chen, Di1; Grasby, Stephen E.4; Shen, Jun5; Li, Tengfei2,3; Ji, Sui2,3; Peng, Ping'an2,3 |
| 刊名 | EARTH AND PLANETARY SCIENCE LETTERS
 |
| 出版日期 | 2023-08-15 |
| 卷号 | 616页码:9 |
| 关键词 | redox structure photic zone euxinia Mesoproterozoic Hg isotope eukaryote evolution |
| ISSN号 | 0012-821X |
| DOI | 10.1016/j.epsl.2023.118211 |
| 英文摘要 | Studies of Mesoproterozoic ocean chemistry have converged on a widely accepted scenario where a stable shallow layer of oxic waters occurred over deeper anoxic ferruginous waters, with mid-depth euxinic waters restricted to continental margins. However, several lines of evidence suggest shallow waters may not always have remained oxic, but fluctuated between oxic, anoxic, and euxinic conditions. Here, we present new Hg-C-S geochemistry data of ca. 1.5-1.4 Ga sediments in the Yanliao Basin to better understand the redox structure of shallow water environments, especially for the photic zone. In this study, positive A199Hg values suggest atmospheric Hg(II) deposition into oxic surface waters, whereas abnormally negative A199Hg values indicate enhanced sequestration of gaseous Hg(0) and photo -reduction of reduced sulfur-bound Hg(II) in response to photic zone euxinia. Our highly fractionated A199Hg values reveal a new scenario, in which the extent of euxinia is more dynamic than generally thought, and may expand from the mid-depth to the photic zone, likely linked to the superimposed operation of enhanced oxidative weathering input of SO2-4 and high OM flux in the water column. Given that euxinic waters may accelerate the sequestration of bio-essential elements, it is suggested that the dynamic euxinia of shallow water played a significant role in delaying the diversification of eukaryotes in the Mesoproterozoic oceans. Our study also highlights that Hg isotopes may act as a promising new proxy to trace redox changes in the surface ocean over geological time.& COPY; 2023 Elsevier B.V. All rights reserved. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001013665500001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/74395]  |
| 专题 | 有机地球化学国家重点实验室 |
| 通讯作者 | Tian, Hui |
| 作者单位 | 1.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China 3.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 4.Geol Survey Canada, Nat Resources Canada, 3303 33rd St NW, Calgary, AB T2L 2A7, Canada 5.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Hubei, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wu, Yaowen,Tian, Hui,Yin, Runsheng,et al. Highly fractionated Hg isotope evidence for dynamic euxinia in shallow waters of the Mesoproterozoic ocean[J]. EARTH AND PLANETARY SCIENCE LETTERS,2023,616:9. |
| APA | Wu, Yaowen.,Tian, Hui.,Yin, Runsheng.,Chen, Di.,Grasby, Stephen E..,...&Peng, Ping'an.(2023).Highly fractionated Hg isotope evidence for dynamic euxinia in shallow waters of the Mesoproterozoic ocean.EARTH AND PLANETARY SCIENCE LETTERS,616,9. |
| MLA | Wu, Yaowen,et al."Highly fractionated Hg isotope evidence for dynamic euxinia in shallow waters of the Mesoproterozoic ocean".EARTH AND PLANETARY SCIENCE LETTERS 616(2023):9. |
入库方式： OAI收割
来源：广州地球化学研究所
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