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GEOREF RECORD

Reduction of CO (sub 2) during serpentinization of olivine at 300 degrees C and 500 bar

Michael E. Berndt, Douglas E. Allen and William E. Seyfried
Reduction of CO (sub 2) during serpentinization of olivine at 300 degrees C and 500 bar
Geology (Boulder) (April 1996) 24 (4): 351-354

Abstract

CO (sub 2) reduction processes occurring during experimental serpentinization of olivine at 300 degrees C and 500 bar confirm that ultramafic rocks can play an important role in the generation of abiogenic hydrocarbon gas. Data reveal that conversion of Fe(II) in olivine to Fe(III) in magnetite during serpentinization leads to production of H (sub 2) and conversion of dissolved CO (sub 2) to reduced-C species including methane, ethane, propane, and an amorphous carbonaceous phase. Hydrocarbon gases generated in the process fit a Schulz-Flory distribution consistent with catalysis by mineral reactants or products. Magnetite is inferred to be the catalyst for methanization during serpentinization, because it has been previously shown to accelerate Fischer-Tropsch synthesis of methane in industrial applications involving mixtures of H (sub 2) and CO (sub 2) . The carbonaceous phase was predominantly aliphatic, but had a significant aromatic component. Although this phase should ultimately be converted to hydrocarbon gases and graphite, if full thermodynamic equilibrium were established, its formation in these experiments indicates that the pathway for reduction of CO (sub 2) during serpentinization processes is complex and involves a series of metastable intermediates.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 24
Serial Issue: 4
Title: Reduction of CO (sub 2) during serpentinization of olivine at 300 degrees C and 500 bar
Affiliation: University of Minnesota, Department of Geology and Geophysics, Minneapolis, MN, United States
Pages: 351-354
Published: 199604
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 37
Accession Number: 1996-036453
Categories: General geochemistryIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 199612
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