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Carbonation and the Urey reaction

Louise H. Kellogg, Harsha Lokavarapu and Donald L. Turcotte
Carbonation and the Urey reaction
American Mineralogist (October 2019) 104 (10): 1365-1368


There are three major reservoirs for carbon in the Earth at the present time, the core, the mantle, and the continental crust. The carbon in the continental crust is mainly in carbonates (limestones, marbles, etc.). In this paper we consider the origin of the carbonates. In 1952, Harold Urey proposed that calcium silicates produced by erosion reacted with atmospheric CO (sub 2) to produce carbonates, this is now known as the Urey reaction. In this paper we first address how the Urey reaction could have scavenged a significant mass of crustal carbon from the early atmosphere. At the present time the Urey reaction controls the CO (sub 2) concentration in the atmosphere. The CO (sub 2) enters the atmosphere by volcanism and is lost to the continental crust through the Urey reaction. We address this process in some detail. We then consider the decay of the Paleocene-Eocene thermal maximum (PETM). We quantify how the Urey reaction removes an injection of CO (sub 2) into the atmosphere. A typical decay time is 100 000 yr but depends on the variable rate of the Urey reaction.

ISSN: 0003-004X
EISSN: 1945-3027
Serial Title: American Mineralogist
Serial Volume: 104
Serial Issue: 10
Title: Carbonation and the Urey reaction
Affiliation: University of California Davis, Department of Earth and Planetary Science, Davis, CA, United States
Pages: 1365-1368
Published: 201910
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 20
Accession Number: 2019-097886
Categories: General geochemistrySolid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2019
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