Impact of green clay authigenesis on element sequestration in marine settings

Andre Baldermann*, Santanu Banerjee, György Czuppon, Martin Dietzel, Juraj Farkaš, Stefan Lӧhr, Ulrike Moser, Esther Scheiblhofer, Nicky M. Wright, Thomas Zack

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    25 Citations (Scopus)
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    Abstract

    Retrograde clay mineral reactions (reverse weathering), including glauconite formation, are first-order controls on element sequestration in marine sediments. Here, we report substantial element sequestration by glauconite formation in shallow marine settings from the Triassic to the Holocene, averaging 3 ± 2 mmol•cm²·kyr−1 for K, Mg and Al, 16 ± 9 mmol·cm²·kyr−1 for Si and 6 ± 3 mmol·cm²·kyr−1 for Fe, which is ~2 orders of magnitude higher than estimates for deep-sea settings. Upscaling of glauconite abundances in shallow-water (0–200 m) environments predicts a present-day global uptake of ~≤ 0.1 Tmol·yr−1 of K, Mg and Al, and ~0.1–0.4 Tmol·yr−1 of Fe and Si, which is ~half of the estimated Mesozoic elemental flux. Clay mineral authigenesis had a large impact on the global marine element cycles throughout Earth’s history, in particular during ‘greenhouse’ periods with sea level highstand, and is key for better understanding past and present geochemical cycling in marine sediments.

    Original languageEnglish
    Article number1527
    Pages (from-to)1-11
    Number of pages11
    JournalNature Communications
    Volume13
    Issue number1
    DOIs
    Publication statusPublished - 22 Mar 2022

    Bibliographical note

    Copyright the Author(s) 2022. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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