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High-temperature thermal expansion and decomposition of garnets

Laurent Thieblot, Jacques Roux and Pascal Richet
High-temperature thermal expansion and decomposition of garnets
European Journal of Mineralogy (February 1998) 10 (1): 7-15


The high-T unit-cell volumes of a synthetic grossular, and natural pyrope and almandine close to end-member compositions have been determined at up to 1490, 1630 and 1370 K by powder XRD using synchrotron radiation. At high T, thermal expansion coefficients increase slightly in the order grossular, pyrope and almandine, with values approximately 2.7, 3.0 and 3.3 X 10 (super -5) /K, respectively. At >><$I> 1500 K, grossular decomposes rapidly to the equilibrium assemblage anorthite + gehlenite + pseudowollastonite; at similar T, pyrope decomposes to corundum + enstatite, not to the stable subsolidus assemblage; for almandine, decomposition begins at approximately 1300 K and is triggered by oxidation of iron, giving hematite, sillimanite and quartz/cristobalite.

ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 10
Serial Issue: 1
Title: High-temperature thermal expansion and decomposition of garnets
Affiliation: Institut de Physique du Globe, Laboratoire des Geomateriaux, Paris, France
Pages: 7-15
Published: 199802
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 32
Accession Number: 1999-014512
Categories: General geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 3 tables
Secondary Affiliation: Centre de Recherche de sur la Synthese et la Chimie des Mineraux, 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: 199906
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