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Covariation between molybdenum and uranium isotopes in reducing marine sediments

文献类型：期刊论文

作者Zhao, Mingyu3,4,5; Tarhan, Lidya4; Shull, David2; Wang, Xiangli1,3,6; Asael, Dan4; Planavsky, Noah4
刊名CHEMICAL GEOLOGY
出版日期2022-08-05
卷号603页码:13
ISSN号0009-2541
关键词Bering Sea U isotope Mo isotope Oxic Euxinic Sediment
DOI10.1016/j.chemgeo.2022.120921
英文摘要The isotopic compositions of redox-sensitive elements such as uranium (U) and molybdenum (Mo) have been extensively used to track the evolution of redox conditions on Earth???s surface. However, additional investigation of the behaviors of U and Mo in modern marine sediments???particularly in reducing sediments underlying oxic seawater???can bolster understanding and improve application of these systems as biogeochemical tracers. Here we present elemental and isotopic Mo and U data from reducing sediments from various sites in the Bering Sea where the extent of bioturbation is well characterized. Total Mo concentrations and total organic carbon contents (TOC) are positively correlated, as are authigenic Mo isotopic compositions and TOC, indicating the presence of authigenic Mo enrichments in these sediments. Similar to what has previously been observed in euxinic settings, we observe a positive correlation between authigenic U and Mo concentrations, and a negative correlation between the isotopic compositions of authigenic U and Mo (??238Uauth and ??98Moauth). These patterns likely reflect close associations of U and Mo reduction to organic carbon degradation. Observed variation in ??98Moauth values could reflect variations in Mo removal efficiency or Mo isotopic fractionation between particles and seawater related to porewater H2S levels. Conversely, we interpret variation in ??238Uauth values in these Bering Sea samples to be related to varying extents of U reduction and removal, coupled with anaerobic carbon degradation. There is no significant correlation between the extent of bioturbation and Mo or U isotope values, suggesting that bioturbation would likely not have a significant influence on sedimentary Mo and U records. Further, the array of U and Mo isotopic data from these sediments is distinct from those observed in anoxic sediments below euxinic seawater???suggesting that a combination of U and Mo isotopic compositions could help to more accurately resolve the redox state of depositional environments from past intervals of Earth???s history.
WOS关键词EASTERN BERING-SEA ; REDOX CONDITIONS ; BLACK SHALES ; AUTHIGENIC URANIUM ; EUXINIC SEDIMENTS ; ORGANIC-MATTER ; ANCIENT OCEAN ; TRACE-METALS ; FRACTIONATION ; MO
资助项目David and Lucille Packard Foundation
WOS研究方向Geochemistry & Geophysics
语种英语
出版者ELSEVIER
WOS记录号WOS:000806779200001
资助机构David and Lucille Packard Foundation ; David and Lucille Packard Foundation ; David and Lucille Packard Foundation ; David and Lucille Packard Foundation ; David and Lucille Packard Foundation ; David and Lucille Packard Foundation ; David and Lucille Packard Foundation ; David and Lucille Packard Foundation ; David and Lucille Packard Foundation ; David and Lucille Packard Foundation ; David and Lucille Packard Foundation ; David and Lucille Packard Foundation ; David and Lucille Packard Foundation ; David and Lucille Packard Foundation ; David and Lucille Packard Foundation ; David and Lucille Packard Foundation
源URL[http://ir.iggcas.ac.cn/handle/132A11/106044]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者Zhao, Mingyu
作者单位1.Univ S Alabama, Dept Marine Sci, Mobile, AL 36688 USA
2.Western Washington Univ, Dept Environm Sci, 516 High St, Bellingham, WA 98225 USA
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
4.Yale Univ, Dept Earth & Planetary Sci, 210 Whitney Ave, New Haven, CT 06511 USA
5.Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England
6.Dauphin Isl Sea Lab, Dauphin Isl, AL 36528 USA
推荐引用方式
GB/T 7714		 Zhao, Mingyu,Tarhan, Lidya,Shull, David,et al. Covariation between molybdenum and uranium isotopes in reducing marine sediments[J]. CHEMICAL GEOLOGY,2022,603:13.
APA Zhao, Mingyu,Tarhan, Lidya,Shull, David,Wang, Xiangli,Asael, Dan,&Planavsky, Noah.(2022).Covariation between molybdenum and uranium isotopes in reducing marine sediments.CHEMICAL GEOLOGY,603,13.
MLA Zhao, Mingyu,et al."Covariation between molybdenum and uranium isotopes in reducing marine sediments".CHEMICAL GEOLOGY 603(2022):13.

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来源：地质与地球物理研究所

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