Shields, GA and Mills, BJW orcid.org/0000-0002-9141-0931 (2021) Evaporite weathering and deposition as a long-term climate forcing mechanism. Geology, 49 (3). pp. 299-303. ISSN 0091-7613
Abstract
Although it is widely accepted that Earth’s long-term surface temperature is regulated by the mutual dependence of silicate weathering and climate on CO2, the root causes of some climatic events remain unresolved. We show here for the first time that imbalances between evaporite weathering and deposition can affect climate through the process of carbonate sedimentation. Calcium sulfate weathering supplies Ca2+ ions to the ocean unaccompanied by carbonate alkalinity, so that increased carbonate precipitation strengthens greenhouse forcing through transfer of CO2 to the atmosphere. Conversely, calcium sulfate deposition weakens greenhouse forcing, while the high depositional rates of evaporite giants may overwhelm the silicate weathering feedback, causing several degrees of planetary cooling. Non-steady-state evaporite dynamics and related feedbacks have hitherto been overlooked as drivers of long-term carbon cycle change. Here, we illustrate the importance of evaporite deposition, in particular, by showing how a series of massive depositional events contributed to global cooling during the mid–late Miocene.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 Geological Society of America. This is an author produced version of an article published in Geology. Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Earth Surface Science Institute (ESSI) (Leeds) |
Funding Information: | Funder Grant number NERC (Natural Environment Research Council) NE/S009663/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 02 Nov 2020 13:50 |
Last Modified: | 04 Nov 2021 01:38 |
Status: | Published |
Publisher: | Geological Society of America |
Identification Number: | 10.1130/G48146.1 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:167333 |