Variable Silicon Isotope Fractionation Between Authigenic Phases and Pore Fluids in Marine Sediments

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中文题名海洋沉积物中自生相和孔隙流体间的可变硅同位素分馏
作者Yuhao Dai;Rebecca A. Pickering;Lucie Cassarino;Seunghee Han;Daniel J. Conley
作者单位Department of Geology, Lund University, Lund, SwedenResearch School of Earth Sciences, Australian National University, Acton, ACT, AustraliaAustralian Centre for Excellence in Antarctic Science, Australian National University, Canberra, ACT, AustraliaY. Dai and R. A. Pickering,Contribution: Conceptualization, Methodology, Validation, Formal analysis, ​Investigation, Data curation, Writing - original draft, Writing - review & editing, Visualization, Project administrationDepartment of Geology, Lund University, Lund, SwedenY. Dai and R. A. Pickering,Contribution: Conceptualization, Methodology, Validation, Formal analysis, ​Investigation, Data curation, Writing - review & editing, Project administrationDepartment of Geology, Lund University, Lund, SwedenLEMAR Laboratory, Institut Universitaire de la Mer, Université de Bretagne Occidental, Plouzané, FranceContribution: Formal analysis, Data curation, Writing - review & editingSchool of Environmental Science and Technology, Gwangju Institute of Science and Technology, Gwangju, South KoreaContribution: Formal analysis, Writing - review & editingDepartment of Geology, Lund University, Lund, SwedenContribution: Conceptualization, Methodology, Validation, Resources, Writing - review & editing, Supervision, Funding acquisition
刊名Geophysical Research Letters
年2025
卷52
期No.12
摘要
Formation and subsequent burial of authigenic phases have been recognized as a key process removing silicon from the ocean. However, the effect of authigenic phase formation on the isotopic mass balance of silicon in the ocean is not clear. Here, we constrain the apparent silicon isotope (δ30Si) fractionation associated with early diagenesis by measuring δ30Si signatures of pore fluids and authigenic phases in a South Atlantic sediment core. The δ30Si offsets between authigenic phases and pore fluids vary between −2.9 and −0.4‰, supporting a substantial negative δ30Si fractionation during early diagenesis. The variable apparent δ30Si fractionation covaries with the amount of sedimentary lithogenic materials and may be attributable to the associated kinetic effects. Overall, our data show that authigenic phases buried along with their precursor phases preferentially remove isotopically light silicon from the ocean, with implications for the isotopic mass balance of the marine silicon cycle.

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