| Mercury (Hg) geochemistry of mid-ocean ridge sediments on the Central Indian Ridge: Chemical forms and isotopic composition | |
| Kim, Jihun1,2; Lim, Dhongil1,2; Jeong, Dohyun1; Xu, Zhaokai3; Kim, Haryun1,2; Kim, Jonguk1; Kim, Dongsung1 | |
| 2022-08-20 | |
| 发表期刊 | CHEMICAL GEOLOGY
 |
| ISSN | 0009-2541 |
| 卷号 | 604页码:11 |
| 通讯作者 | Lim, Dhongil(oceanlim@kiost.ac.kr) |
| 摘要 | To geochemically characterize mercury (Hg) in the deep-sea ridge environment, the total concentration, chemical forms (sequential leaching extraction), and isotopic compositions of Hg in surface sediments from the middle portion of the Central Indian Ridge were investigated. Highly elevated Hg concentrations (up to 13,000 ng/g) in sediments near the hydrothermal vent are associated with intense hydrothermal activity driven by serpentinization. The hydrothermal impact on these sediments is also evident in the REECN fractionation pattern with a remarkably strong positive europium (Eu) anomaly. Most volcanic and hydrothermal Hg in the study area is preferentially precipitated with sulfides; in the hydrothermal vent area, however, scavenging by Fe-Mn hydroxides is another significant removal pathway of Hg. Thus, such precipitation and production of sulfides and hydroxides are a major cause of local enrichment of Hg around the mid-ocean ridge. Most sediments show limited or no mass-independent fractionation (Delta Hg-199 = +0.02 +/- 0.21 parts per thousand, 2 sigma, n = 15), indicating that syngenetic magmatic or mantle-derived materials are the dominant Hg source. However, the large variation in massdependent fractionation was observed, especially in the vent-distal sediments (delta Hg-202 = -1.10 +/- 0.80 parts per thousand, 2 sigma, n = 11), which occurred mainly during the formation of the sulfides and may be associated with preferential precipitation of lighter isotopes. Our study demonstrates that an off-axis high-temperature hydrothermal system driven by exothermic serpentinization of ultramafic mantle rocks may serve as a significant Hg source and provides further insights into grasping the behavior of hydrothermal and volcanogenic Hg in active deep-sea ridge systems. |
| 关键词 | Chemical fractionation Isotope Mercury Hydrothermal vents Mid-ocean ridge sediments |
| DOI | 10.1016/j.chemgeo.2022.120942 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | Korean Ministry of Oceans and Fisheries, Korea[20170411] ; National Research Foundation of Korea (NRF)[2021R1I1A2059972] ; National Research Foundation of Korea (NRF)[2021R1A2C1014443] ; Ministry of Science and ICT of Korea government |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| WOS记录号 | WOS:000806797900001 |
| 出版者 | ELSEVIER |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/179447 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Lim, Dhongil |
| 作者单位 | 1.Korea Inst Ocean Sci & Technol, Busan 49111, South Korea 2.Univ Sci & Technol, Daejeon 34113, South Korea 3.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China |
| 推荐引用方式 GB/T 7714 | Kim, Jihun,Lim, Dhongil,Jeong, Dohyun,et al. Mercury (Hg) geochemistry of mid-ocean ridge sediments on the Central Indian Ridge: Chemical forms and isotopic composition[J]. CHEMICAL GEOLOGY,2022,604:11. |
| APA | Kim, Jihun.,Lim, Dhongil.,Jeong, Dohyun.,Xu, Zhaokai.,Kim, Haryun.,...&Kim, Dongsung.(2022).Mercury (Hg) geochemistry of mid-ocean ridge sediments on the Central Indian Ridge: Chemical forms and isotopic composition.CHEMICAL GEOLOGY,604,11. |
| MLA | Kim, Jihun,et al."Mercury (Hg) geochemistry of mid-ocean ridge sediments on the Central Indian Ridge: Chemical forms and isotopic composition".CHEMICAL GEOLOGY 604(2022):11. |
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