Abstract Redox-sensitive trace metals have been used extensively as geochemical proxies to infer the redox-status of marine sediments at the time of their deposition, and by extension, the concentration of oxygen in the overlying water and atmosphere. However, to reliably apply these paleoredox proxies in ancient sediment samples we must calibrate their geochemical behavior in modern sedimentary environments with known redox-status. Here we report a new compilation and analysis of modern trace-metal enrichment data for a range of marine depositional environments, including euxinic basins, continental margin upwelling settings, and normal oxic settings. The enrichments (i.e., concentrations normalized to aluminum content) of vanadium, uranium, molybdenum and rhenium (the VUMoRe database) in the various depositional categories were analyzed using receiver operating characteristic (ROC) curve analysis to systematically identify threshold values that differentiate the various settings. The enrichment of both Mo (> 5 μg g−1/%) and V (> 23 μg g−1/%), but with V not exceeding 46 μg g−1/%, provides strong evidence for a euxinic basin-type depositional environment. Furthermore, the enrichment of V (> 46 μg g−1/%), U (> 5 μg g−1/%) and Mo (> 5 μg g−1/%) is strong evidence for sediments depositing within the anoxic core of perennial OMZ environments, whereas the enrichment of U (> 1 μg g−1/%) coinciding with a low enrichment of V (

中文翻译：

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作为古氧化还原代理的氧化还原敏感微量金属：现代沉积物数据的回顾和分析

摘要 氧化还原敏感的痕量金属已被广泛用作地球化学代理，以推断海洋沉积物沉积时的氧化还原状态，进而推断上覆水和大气中的氧气浓度。然而，为了在古代沉积物样品中可靠地应用这些古氧化还原代理，我们必须在具有已知氧化还原状态的现代沉积环境中校准它们的地球化学行为。在这里，我们报告了一系列海洋沉积环境的现代痕量金属富集数据的新汇编和分析，包括 euxinic 盆地、大陆边缘上升流环境和正常含氧环境。钒、铀、使用受试者工作特征 (ROC) 曲线分析对各种沉积类别中的钼和铼（VUMoRe 数据库）进行分析，以系统地确定区分各种设置的阈值。Mo (> 5 μg g-1/%) 和 V (> 23 μg g-1/%) 的富集，但 V 不超过 46 μg g-1/%，为优生盆地型提供了强有力的证据沉积环境。此外，V (> 46 μg g-1/%)、U (> 5 μg g-1/%) 和 Mo (> 5 μg g-1/%) 的富集是沉积物沉积在缺氧核心内的有力证据常年 OMZ 环境，而 U (> 1 μg g−1/%) 的富集与 V 的低富集一致（Mo (> 5 μg g-1/%) 和 V (> 23 μg g-1/%) 的富集，但 V 不超过 46 μg g-1/%，为优生盆地型提供了强有力的证据沉积环境。此外，V (> 46 μg g-1/%)、U (> 5 μg g-1/%) 和 Mo (> 5 μg g-1/%) 的富集是沉积物沉积在缺氧核心内的有力证据常年 OMZ 环境，而 U (> 1 μg g−1/%) 的富集与 V 的低富集一致（Mo (> 5 μg g-1/%) 和 V (> 23 μg g-1/%) 的富集，但 V 不超过 46 μg g-1/%，为优生盆地型提供了强有力的证据沉积环境。此外，V (> 46 μg g-1/%)、U (> 5 μg g-1/%) 和 Mo (> 5 μg g-1/%) 的富集是沉积物沉积在缺氧核心内的有力证据常年 OMZ 环境，而 U (> 1 μg g−1/%) 的富集与 V 的低富集一致（