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Experimental determination of composition dependence of hydrous silicate melts on sulfate solubility

Mihai N. Ducea, Brent I. A. McInnes and Peter J. Wyllie
Experimental determination of composition dependence of hydrous silicate melts on sulfate solubility
European Journal of Mineralogy (February 1999) 11 (1): 33-43

Abstract

The solubility of SO (sub 3) in quartz-normative and nepheline-normative compositions in the system Na (sub 2) O-Al (sub 2) O (sub 3) -SiO (sub 2) -H (sub 2) O was measured at 800-825 degrees C and 1.5-1.7 kbar, 1.5, 3, 10 or 15 wt.% CaSO (sub 4) being added to two H (sub 2) O-saturated synthetic compositions near the eutectics in quartz-albite-H (sub 2) O and nepheline-albite-H (sub 2) O. The low sulphate solubilities measured in the quartz-normative quenched glasses (0.06-0.12% SO (sub 3) ) are similar to previous results on quartz-normative melts from natural rock compositions, but the sulphate contents of quenched glasses in the nepheline-normative system are < or = six times higher (0.17-0.36% SO (sub 3) ). Precipitation of anhydrite in the quartz-normative melt requires the addition of approximately 6 wt.% CaSO (sub 4) at 800 degrees C, and 10 wt.% CaSO (sub 4) at 820 degrees C. In contrast, < 1.5 wt.% CaSO (sub 4) added to the nepheline-normative liquid is sufficient to cause precipitation of hauyne or an immiscible sulphate-rich liquid. It is concluded that sulphate solubility in hydrous magmas is significantly affected by silica activity (melt alkalinity) and SiO (sub 2) concentration in melts.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 11
Serial Issue: 1
Title: Experimental determination of composition dependence of hydrous silicate melts on sulfate solubility
Affiliation: California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, CA, United States
Pages: 33-43
Published: 199902
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 34
Accession Number: 1999-033842
Categories: General geochemistryIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendix
Illustration Description: illus. incl. 4 tables
Secondary Affiliation: CSIRO, AUS, Australia
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199912
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