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Carbon-fluid equilibria and the oxidation state of the upper mantle

Abstract:

IT has been proposed that the oxidation state of the Earth's upper mantle is buffered by C-O fluids in equilibrium with elemental carbon1,2. A large body of data on the oxygen fugacities (fo2) recorded by mantle rocks and their derivative melts now allows us to test this proposal. By comparing the measured fo2 values with those calculated for carbon-CO2-CO-carbonate equilibria along appropriate mantle geotherms, we find the data to be wholly consistent with this hypothesis. Moreover, the calc...

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Authors


Blundy, JD More by this author
Brodholt, JP More by this author
More by this author
Institution:
University of Oxford
Department:
Oxford, MPLS, Earth Sciences
Journal:
Nature
Volume:
349
Issue:
6307
Pages:
321-324
Publication date:
1991-01-24
ISSN:
0028-0836
URN:
uuid:771ae7aa-f4f4-40e3-a187-5c82a811c8d2
Source identifiers:
177744
Local pid:
pubs:177744
Language:
English

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