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GEOREF RECORD

Properties of lower-mantle Al-(Mg,Fe)SiO (sub 3) perovskite

D. Andrault
Properties of lower-mantle Al-(Mg,Fe)SiO (sub 3) perovskite (in Advances in high-pressure mineralogy, Eiji Ohtani (editor))
Special Paper - Geological Society of America (2007) 421: 15-36

Abstract

The properties of the main lower-mantle phase appear to be more complex than expected. The common procedure of using the properties of the simplified MgSiO (sub 3) (and [Mg,Fe]SiO (sub 3) ) composition for direct analogy to the Al-bearing (Mg,Fe)SiO (sub 3) lower-mantle perovskite can lead to significant misinterpretations. The presence of Al and Fe affects the equation of state, the defect population, the ability of this phase to insert minor and trace elements, and the transport properties, etc. Some difficulties remain for the quantitative determination of these effects because of two main reasons: many experimental techniques are ineffective because silicate perovskite is metastable at ambient conditions, and the crystal chemistry of Al-(Mg,Fe)SiO (sub 3) perovskite is complex and can evolve with pressure, temperature, and chemical composition. This paper reviews the recent progress made in the determination of its properties and presents additional new results from our group. The original data concern the pressure-volume-temperature (P-V-T) equation of state of Al-(Mg,Fe)SiO (sub 3) perovskite, the change of oxidation state (dismutation) of Fe (super 2+) into a mixture of Fe (super 3+) and Fe (super 0) , which drives the lower-mantle oxygen fugacity to the Fe/(Mg,Fe)O buffer, and the stability of the (Mg,Fe)SiO (sub 3) perovskite to the highest pressure and temperature conditions.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 421
Title: Properties of lower-mantle Al-(Mg,Fe)SiO (sub 3) perovskite
Title: Advances in high-pressure mineralogy
Author(s): Andrault, D.
Author(s): Ohtani, Eijieditor
Affiliation: Universite Blaise Pascal, Laboratoire Magmas et Volcans, Clermont-Ferrand, France
Affiliation: Tohoku University, Institue of Mineralogy, Petrology, and Economic Geology, Sendai, Japan
Pages: 15-36
Published: 2007
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 978-0-8137-2421-8
References: 154
Accession Number: 2008-044743
Categories: Geophysics of minerals and rocks
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200813
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