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The effect of CO (sub 2) on the solubility of H (sub 2) O-Cl fluids in andesitic melt

Roman E. Botcharnikov, Francois Holtz and Harald Behrens
The effect of CO (sub 2) on the solubility of H (sub 2) O-Cl fluids in andesitic melt (in EMPG XI; Experimental mineralogy, petrology and geochemistry symposium, Jonathan D. Bundy (editor), Simon C. Kohn (editor) and Michael J. Walter (editor))
European Journal of Mineralogy (October 2007) 19 (5): 671-680

Abstract

The solubility of C-O-H-Cl-bearing fluids in andesitic melt was investigated experimentally at temperatures of 1050 and 1200 degrees C and pressure of 200 MPa. The CO (sub 2) -free andesitic melts produced experimentally contained up to 5.5-6 wt.% H (sub 2) O and up to 2.5 wt.% Cl at the investigated conditions. The complex non-linear relationship between the concentrations of H (sub 2) O and Cl in the melt indicates a strong non-ideality of the H (sub 2) O-salt-bearing fluid phase(s), presumably resulting in the formation of two immiscible fluids. The addition of CO (sub 2) to the system (80-800 ppm dissolved CO (sub 2) in the melt) has two effects: a simple dilution of the fluid at low bulk Cl concentration and a significant influence on the mixing properties of the H (sub 2) O- and Cl-bearing fluids related to the enlargement of the immiscibility gap in the fluid at higher bulk Cl content. The first effect results in lower H (sub 2) O (by approximately 1 wt.%) and almost constant Cl concentrations in the melt, while the second effect causes an increase in activity coefficients of both H (sub 2) O and Cl. This effect of CO (sub 2) is expected to be most pronounced at low pressures and high CO (sub 2) concentrations in Cl-bearing mafic melts due to an enlargement of the immiscibility gap in fluids with decreasing pressure and an increase in proportions of divalent cations.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 19
Serial Issue: 5
Title: The effect of CO (sub 2) on the solubility of H (sub 2) O-Cl fluids in andesitic melt
Title: EMPG XI; Experimental mineralogy, petrology and geochemistry symposium
Author(s): Botcharnikov, Roman E.Holtz, FrancoisBehrens, Harald
Author(s): Bundy, Jonathan D.editor
Author(s): Kohn, Simon C.editor
Author(s): Walter, Michael J.editor
Affiliation: Universitaet Hannover, Institut fuer Mineralogie, Hanover, Federal Republic of Germany
Pages: 671-680
Published: 200710
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
Meeting name: Eleventh international symposium on Experimental mineralogy, petrology and geochemistry
Meeting location: Bristol, GBR, United Kingdom
Meeting date: 20060911Sept. 11-13, 2006
References: 50
Accession Number: 2008-002134
Categories: Igneous and metamorphic petrology
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200802
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