Thallium and V isotopes in organic-rich sediments have recently been explored for reconstructing marine oxygenation by tracking the burial of Mn oxides either locally or globally. The ‘Fe and Mn shuttle’ is a well known mechanism that can transport elements associated with Fe and Mn oxide phases formed under mildly oxidizing shallow water environments both laterally and vertically to euxinic (sulfidic water column) deep waters. The Fe and Mn shuttle has been demonstrated to strongly affect Fe and Mo isotope compositions of sediments accumulating beneath anoxic and euxinic settings. Similar to Mo, Tl and V are also enriched in oceanic ferromanganese crust and nodules, which impart the largest isotopic offsets from modern seawater for Tl and V. Thus, the mechanism of an Fe and Mn shuttle has the potential to, but currently unconstrained, affect Tl and V isotopic compositions (εTl and δV) in organic-rich sediments in the modern and ancient records.

中文翻译：

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铁和锰穿梭对黑海沉积物中的沉积铊和钒同位素特征没有影响

最近，人们通过追踪局部或全球锰氧化物的埋藏，探索了富含有机物沉积物中的铊和钒同位素，以重建海洋氧合。 “铁和锰穿梭机”是一种众所周知的机制，可以将与在轻度氧化浅水环境下形成的铁和锰氧化物相相关的元素横向和垂直运输到含硫（含硫水柱）深水区。 Fe 和 Mn 穿梭已​​被证明会强烈影响缺氧和常氧环境下沉积物的 Fe 和 Mo 同位素组成。与 Mo 类似，Tl 和 V 也在海洋铁锰结壳和结核中富集，这使得 Tl 和 V 与现代海水的同位素偏移量最大。因此，Fe 和 Mn 穿梭机制有潜力，但目前不受限制，影响现代和古代记录中富含有机物沉积物中的 Tl 和 V 同位素组成（εTl 和 δV）。