Spatially heterogenous seawater δ34S and global cessation of Ca-sulfate burial during the Toarcian oceanic anoxic event

Han, Zhong; Hu, Xiumian; Newton, Robert J.; He, Tianchen; Mills, Benjamin J.W.; Jenkyns, Hugh C.; Ruhl, Micha; Jamieson, Robert A.

doi:10.1016/j.epsl.2023.118404

Earth and Planetary Science Letters

2023

DOI: 10.1016/j.epsl.2023.118404

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Spatially heterogenous seawater δ34S and global cessation of Ca-sulfate burial during the Toarcian oceanic anoxic event

Zhong Han,

Xiumian Hu,

Robert J. Newton

et al.

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2024

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Cited by 2 publications

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Strontium isotope evidence for regional enhanced continental weathering during the early Toarcian in the Tethys Himalaya

Yang,

Han,

et al. 2024

Palaeogeography, Palaeoclimatology, Palaeoecology

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Strontium isotope evidence for regional enhanced continental weathering during the early Toarcian in the Tethys Himalaya

Yang,

Han,

et al. 2024

Palaeogeography, Palaeoclimatology, Palaeoecology

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Modelling sulfate concentrations in the global ocean through Phanerozoic time

Krause,

Shields,

Newton

et al. 2024

JGS

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Understanding the long-term variance of seawater sulfate concentrations ([SO 4 2- ] sw ) is critical to understanding the dynamic relationship between the sulfur, carbon, calcium, and oxygen cycles, and their influence on Earth's habitability. Here, we explore how [SO 4 2- ] sw has changed throughout the Phanerozoic, and its impact on other elemental cycles. We do this by utilising the biogeochemical box model GEOCARBSULFOR. The model suggests that [SO 4 2- ] sw rose throughout the Paleozoic, declined during the Mesozoic, and then rose once more in the Cenozoic, generally matching geochemical proxies. Atmospheric oxygen mirrors [SO 4 2- ] sw changes during the Paleozoic and Mesozoic, but intriguingly, decouples during the Cenozoic. We further explored controls on [SO 4 2- ] sw by modifying the modelled gypsum fluxes via the incorporation of evaporite data from the geological record. We find that forcing gypsum burial with the observed evaporite deposition data causes the model to better match proxy records at some times, but worsens predictions at others. Finally, we investigate model reliance on a prescribed record of marine calcium concentrations, finding that it is a dominant control on modelled Phanerozoic [SO 4 2- ] sw , and that removing this control seriously degrades model predictions. We conclude that no model can yet simulate a reasonable evolution of both the calcium and sulfur cycles. Thematic collection: This article is part of the Sulfur in the Earth system collection available at: https://www.lyellcollection.org/topic/collections/sulfur-in-the-earth-system Supplementary material: https://doi.org/10.6084/m9.figshare.c.7164928

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Spatially heterogenous seawater δ34S and global cessation of Ca-sulfate burial during the Toarcian oceanic anoxic event

Cited by 2 publications

References 75 publications

Strontium isotope evidence for regional enhanced continental weathering during the early Toarcian in the Tethys Himalaya

Strontium isotope evidence for regional enhanced continental weathering during the early Toarcian in the Tethys Himalaya

Modelling sulfate concentrations in the global ocean through Phanerozoic time

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