综述与评述

海洋ReMoU对氧化还原环境的指示作用

  • 张晓潼 ,
  • 袁华茂 ,
  • 宋金明 ,
  • 段丽琴
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  • 1.中国科学院海洋生态与环境科学重点实验室,中国科学院海洋研究所,山东 青岛 266071
    2.中国科学院大学,北京 100049
    3.青岛海洋科学与技术试点国家实验室 海洋生态与环境 科学功能实验室,山东 青岛 266237
    4.中国科学院海洋大科学中心,山东 青岛 266071
张晓潼(1997-),女,河北邢台人,硕士研究生,主要从事海洋生物地球化学研究. E-mail:zhangxiaotong19@mails.ucas.ac.cn
袁华茂(1975-),男,江苏南通人,研究员,主要从事海洋生物地球化学研究. E-mail:yuanhuamao@qdio.ac.cn

收稿日期: 2021-06-27

  修回日期: 2022-01-28

  网络出版日期: 2022-04-28

基金资助

中国科学院战略先导性专项“近海环境健康评估技术与海域评估方案”(XDA23050501);国家自然科学基金面上项目“微生物对富营养化近海沉积物砷循环的调控机制解析:以长江口为例”(41976037)

Indication to Redox Conditions of Re, Mo and U in Marine Environment

  • Xiaotong ZHANG ,
  • Huamao YUAN ,
  • Jinming SONG ,
  • Liqin DUAN
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  • 1.CAS Key Laboratory of Marine Ecology and Environmental Sciences,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China
    2.University of Chinese Academy of Sciences,Beijing 100049,China
    3.Marine Ecology and Environmental Science Laboratory,Pilot National Laboratory for Marine Science and Technology,Qingdao 266237,China
    4.Center for Ocean Mega-Science,Chinese Academy of Sciences,Qingdao 266071,China
ZHANG Xiaotong (1997-), female, Xingtai City, Hebei Province, Master student. Research areas include marine biogeochemistry. E-mail: zhangxiaotong19@mails.ucas.ac.cn
YUAN Huamao (1975-), male, Nantong City, Jiangsu Province, Professor. Research areas include marine biogeochemistry. E-mail: yuanhuamao@qdio.ac.cn

Received date: 2021-06-27

  Revised date: 2022-01-28

  Online published: 2022-04-28

Supported by

the Strategic Priority Research Program of the Chinese Academy of Sciences "Technique and scheme of Chinese offshore environmental health assessment"(XDA23050501);The National Natural Science Foundation of China "Microbial regulation of arsenic cycling in eutrophic coastal sediments: a case study of the Yangtze River Estuary"(41976037)

摘要

氧化还原敏感微量元素Re、Mo和U主要依靠扩散作用通过沉积物—水界面,在不同氧化还原条件下的沉积物中自生富集,Re在轻度还原的次氧化沉积环境中富集,Mo在还原性更强的硫化环境中富集,而U具有较宽的富集沉积深度区间。Re、Mo和U独特的地球化学行为使其可用于指示海洋环境的氧化还原状态,其在沉积物中的自生富集程度与沉积时所处的氧化还原条件具有良好的相关性:Re、Mo和U在氧化沉积环境(Re/Al<1.3×10-7,Mo/Al<0.4×10-4)和季节性缺氧区覆盖的沉积环境中富集程度较小,在常年性缺氧区覆盖的沉积环境(U/Al>5×10-4,Mo/Al>5×10-4)和硫化沉积环境(Mo/Al>5×10-4)中富集程度较大。除依据其地球化学行为特征和相对富集程度进行定性分析之外,还可以结合元素富集系数(TMEF<1表示亏损,TMEF>1表示富集,TMEF>3表示明显富集,TMEF>10表示强烈富集)、元素比值(Re/Mo≤0.3×10-3指示氧化环境,Re/Mo≈10×10-3~30×10-3指示缺氧环境,Re/Mo≈0.7×10-3~0.8×10-3指示硫化环境)、元素共变体系(MoEF/UEF≈0.1×现代海水值~0.3×现代海水值指示氧化—次氧化环境,MoEF/UEF>1×现代海水值指示缺氧环境,MoEF/UEF≈3×现代海水值~10×现代海水值指示硫化环境)以及同位素(氧化沉积环境中δ98/95Mo≈-0.7‰,次氧化沉积环境中δ98/95Mo≈-0.5‰~+1.3‰,缺氧沉积环境中δ98/95Mo≈+1.6‰,硫化沉积环境中δ98/95Mo≈+2.2‰~ +2.5‰)等进行综合定量判别。值得关注的是,目前Re、Mo和U的氧化还原迁移转化机制尚未完善,现代海洋系统的数据较为有限,Re、Mo和U富集程度的区域分异性和高度可变性仍有待进一步研究。未来仍需要更多的现代海洋系统氧化还原敏感微量元素数据和应用实例,以更好地与古海洋体系相结合来完善氧化还原敏感微量元素指标的指示作用。

本文引用格式

张晓潼 , 袁华茂 , 宋金明 , 段丽琴 . 海洋ReMoU对氧化还原环境的指示作用[J]. 地球科学进展, 2022 , 37(4) : 358 -369 . DOI: 10.11867/j.issn.1001-8166.2022.013

Abstract

Redox Sensitive Trace Elements (RSE), such as Re, Mo, and U, are often autogenetically enriched in sediments because of their different solubilities and/or affinities for particulates under various redox states at the time of sediment deposition when diffusing through the sediment-water interface. The enrichment of Re is primarily in a suboxic depositional environment but that of Mo is in an euxinic environment. In contrast, U has a relatively large depositional depth range in sediments. The special geochemical behavior of the RSEs makes it possible to indicate the redox state, as the autogenetic enrichment degrees in sediments have a good correlation with the redox conditions of marine sedimentary environments. Lower enrichments were recorded from sediments deposited in oxic (Re/Al<1.3×10-7, Mo/Al<0.4×10-4) and beneath seasonal oxygen minimum zone environments, while higher enrichments were recorded from sediments deposited within the perennial oxygen minimum zone (U/Al>5×10-4, Mo/Al>5×10-4) and euxinic (Mo/Al>5×10-4) environments. In addition to the relative enrichment degree, the paleoredox proxies of the enrichment coefficient (TMEF<1 means depletion; TMEF>1 means enrichment; TMEF>3 means obvious enrichment; TMEF>10 means significant enrichment), trace elements ratios (Re/Mo≤0.3×10-3 indicates an oxic environment; Re/Mo≈10×10-3~30×10-3 indicates an anoxic environment; Re/Mo≈0.7×10-3~0.8×10-3 indicates an euxinic environment), the trace elements covariant system (MoEF/UEF≈0.1×modern seawater value~0.3×modern seawater value indicates an oxic-suboxic environment; MoEF/UEF>1×modern seawater value indicates an anoxic environment; MoEF/UEF≈3×modern seawater value~10×modern seawater value indicates an euxinic environment), and isotope values (δ98/95Mo≈-0.7‰ in an oxic environment; δ98/95Mo≈-0.5‰~+1.3‰ in a suboxic environment; δ98/95Mo≈+1.6‰ in an anoxic environment; δ98/95Mo≈+2.2‰~+2.5‰ in an euxinic environment) could also be utilized to comprehensively unravel the history of depositional environments. It should be noted that the migration and transformation mechanisms under the different redox conditions of Re, Mo, and U are imperfect, and related datasets in modern marine systems are limited. The highly variable enrichment degrees of Re, Mo, and U reflect obvious regional differentiation, which is yet to be examined. In future, more observations and research in modern marine systems are needed to improve the indicative utility of RSEs combined with the paleo-marine system.

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