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Experimental study of partial melting of biotite-orthopyroxene-quartz bearing assemblages in the system KAlO (sub 2) -MgO-FeO-SiO (sub 2) -H (sub 2) O

Alexander A. Graphchikov and Alexander N. Konilov
Experimental study of partial melting of biotite-orthopyroxene-quartz bearing assemblages in the system KAlO (sub 2) -MgO-FeO-SiO (sub 2) -H (sub 2) O
European Journal of Mineralogy (February 1996) 8 (1): 143-152

Abstract

The melting T of these assemblages were determined experimentally, using synthetic phases including biotites with various Fe contents, in the P range 100-500 MPa and under the QFM fO (sub 2) buffer. Water contents in the starting mixtures ranged from 11 to 78 wt.%. The analysis of glass (quenched liquids) in the experimental products showed them to have approximately 79 wt.% SiO (sub 2) with very low Fe and Mg contents which do not change with changing Fe in the system or with T. The Fe/(Fe + Mg) ratio of the melt is greater than in the biotite and coexisting orthopyroxene. The solidus T of biotite-orthopyroxene-quartz assemblages decrease considerably with increasing Fe content in biotite. Thus water-saturated as well as fluid-absent (dehydration) melting of biotite-quartz assemblages may occur at T of 700-800 degrees C. Natural biotites are probably stabilized up to higher melting T by the presence of Ti and Al.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 8
Serial Issue: 1
Title: Experimental study of partial melting of biotite-orthopyroxene-quartz bearing assemblages in the system KAlO (sub 2) -MgO-FeO-SiO (sub 2) -H (sub 2) O
Affiliation: Russian Academy of Sciences, Institute of Experimental Mineralogy, Moscow, Russian Federation
Pages: 143-152
Published: 199602
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 27
Accession Number: 1996-024295
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199608
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