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Widespread clay authigenesis and highly congruent silicate weathering in the Marinoan aftermath

Yin, YS; Wei, GY; Pogge von Strandmann, PAE; Lechte, MA; Hohl, SV; Lin, YB; Li, D; ... Ling, HF; + view all (2023) Widespread clay authigenesis and highly congruent silicate weathering in the Marinoan aftermath. Earth and Planetary Science Letters , 623 , Article 118423. 10.1016/j.epsl.2023.118423. Green open access

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Abstract

The termination of the Cryogenian period marks a transition from an extreme ice- to a greenhouse climate, likely initiated by increased atmospheric CO2, however uncertainties persist on continental weathering regarding this climate transition. Here we present paired lithium isotope data from carbonate (δ7Licarb) and carbonate-hosted silicate (δ7Lisili) components of the Marinoan cap carbonates to constrain C and Si cycles in the deglacial period. We find that the silicate component of cap carbonates is dominated by marine authigenic clays with minor contributions from terrestrially detrital materials and oxides. Built from δ7Lisili data, large variations of seawater δ7Li suggest a heterogeneous marine Li reservoir due to a stratified ocean in the deglacial period. Overall, widespread clay authigenesis and low seawater δ7Li values indicate active carbon-silicon cycling and congruent silicate weathering due to warm climate and exposure of fresh rock surface in the Marinoan aftermath, which promotes the deposition of cap carbonates and stabilization of Earth's surface environment.

Type: Article
Title: Widespread clay authigenesis and highly congruent silicate weathering in the Marinoan aftermath
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.epsl.2023.118423
Publisher version: https://doi.org/10.1016/j.epsl.2023.118423
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions.
Keywords: Snowball Earth, Cap carbonate, Authigenic clay, Continental weathering, Lithium isotope
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery-pp.ucl.ac.uk/id/eprint/10180517
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