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Overlooked shelf sediment reductive sinks of dissolved rhenium and uranium in the modern ocean

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  • Qingquan Hong

    (Nanjing University)

  • Yilin Cheng

    (Xiamen University
    Xiamen University)

  • Yang Qu

    (Nanjing University)

  • Lin Wei

    (Xiamen University
    Xiamen University)

  • Yumeng Liu

    (Nanjing University)

  • Jianfeng Gao

    (Chinese Academy of Sciences)

  • Pinghe Cai

    (Xiamen University
    Xiamen University)

  • Tianyu Chen

    (Nanjing University)

Abstract

Rhenium (Re) and uranium (U) are essential proxies in reconstructing past oceanic oxygenation evolution. However, their removal in continental shelf sediments, hotspots of early diagenesis, were previously treated as quantitatively unimportant sinks in the ocean. Here we examine the sedimentary reductive removal of Re and U and their coupling with organic carbon decomposition, utilizing the 224Ra/228Th disequilibria within the East China Sea shelf. We identified positive correlations between their removal fluxes and the rates of sediment oxygen consumption or organic carbon decomposition. These correlations enable an evaluation of global shelf reductive sinks that are comparable to (for Re) or higher than (~4-fold for U) previously established suboxic/anoxic sinks. These findings suggest potential imbalances in the modern budgets of Re and U, or perhaps a substantial underestimation of their sources. Our study thus highlights shelf sedimentary reductive removal as critical yet overlooked sinks for Re and U in the modern ocean.

Suggested Citation

  • Qingquan Hong & Yilin Cheng & Yang Qu & Lin Wei & Yumeng Liu & Jianfeng Gao & Pinghe Cai & Tianyu Chen, 2024. "Overlooked shelf sediment reductive sinks of dissolved rhenium and uranium in the modern ocean," Nature Communications, Nature, vol. 15(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-48297-y
    DOI: 10.1038/s41467-024-48297-y
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    1. Antao Xu & Ed Hathorne & Georgi Laukert & Martin Frank, 2023. "Overlooked riverine contributions of dissolved neodymium and hafnium to the Amazon estuary and oceans," Nature Communications, Nature, vol. 14(1), pages 1-12, December.
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