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Immiscible silicate liquids in the system SiO (sub 2) -TiO (sub 2) -Al (sub 2) O (sub 3)

Marcus Kirschen, Christian DeCapitani, Francis Millot, Jean-Claude Rifflet and Jean-Pierre Coutures
Immiscible silicate liquids in the system SiO (sub 2) -TiO (sub 2) -Al (sub 2) O (sub 3)
European Journal of Mineralogy (June 1999) 11 (3): 427-440


Coexisting liquids in this system have been synthesized at 2000-2500 K with a laser-heated air levitation apparatus to determine the SiO (sub 2) -TiO (sub 2) miscibility gap and its extrapolation to the Al (sub 2) O (sub 3) -bearing system. Compositions of quenched coexisting liquids in the SiO (sub 2) -TiO (sub 2) and SiO (sub 2) -TiO (sub 2) -Al (sub 2) O (sub 3) system demonstrate the dramatic decline of the miscibility gap when as little as 3 mol.% Al (sub 2) O (sub 3) is added. With bulk compositions with 10 mol.% Al (sub 2) O (sub 3) no evidence was found for a stable liquid-liquid phase separation above 2073 K. Although experimental liquidus data can be modelled with Margules-type excess polynomials for the melt, the calculated ternary miscibility gap is in disagreement with experiments when conventional extrapolation are applied; however, the application of a generalized extrapolation method based on weighting methods reproduces the experimentally determined miscibility gap in detail. Extrapolation outside the immiscibility region yields a first-order approximation of the excess Gibbs free energy of the melt.

ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 11
Serial Issue: 3
Title: Immiscible silicate liquids in the system SiO (sub 2) -TiO (sub 2) -Al (sub 2) O (sub 3)
Affiliation: Mineralogisch-Petrographisches Institut, Basel, Switzerland
Pages: 427-440
Published: 199906
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 65
Accession Number: 1999-046893
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
Secondary Affiliation: Recherche Scientifique, Orleans, FRA, France
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199916
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