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Intracrystalline Fe (super 2+) -Mg ordering in augite; experimental study and geothermometric applications

Gianmario Molin and Pier Francesco Zanazzi
Intracrystalline Fe (super 2+) -Mg ordering in augite; experimental study and geothermometric applications
European Journal of Mineralogy (October 1991) 3 (5): 863-875

Abstract

An augite crystal from a basaltic dyke on Vulcano Island, Aeolian Archipelago, was equilibrated at 670-1180 degrees C and quenched to room temperature. After each experiment the partitioning of Fe (super 2+) and Mg between the M1 and M2 sites were determined by crystal structure refinement; these partitioning results were then used to calibrate a new clinopyroxene geothermometer which estimates closure T for the exchange reaction. This new geothermometer was then applied to six clinopyroxenes from a basaltic andesite lava on Salina Island: calculated closure T are 600 degrees C for samples near the base of the flow, 793 degrees C for the sample from the top of the flow and 513 degrees C for the sample nearest the middle of the flow. A mathematical cooling model was then used in conjunction with these equilibration T to calculate cooling rates at different heights in the Salina Island lava.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 3
Serial Issue: 5
Title: Intracrystalline Fe (super 2+) -Mg ordering in augite; experimental study and geothermometric applications
Affiliation: Universita di Padova, Dipartimento di Mineralogia e Petrologia, Padova, Italy
Pages: 863-875
Published: 199110
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 15
Accession Number: 1995-056218
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 4 tables
N38°19'60" - N38°25'00", E14°52'00" - E15°00'00"
Secondary Affiliation: Universita di Perugia, ITA, Italy
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199520
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