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Stability of (Mg,Fe)SiO 3 perovskite and the structure of the lowermost mantle
Author(s) -
Stixrude Lars,
Bukowinski M. S. T.
Publication year - 1992
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/92gl01066
Subject(s) - mantle (geology) , post perovskite , silicate , geology , core–mantle boundary , silicate perovskite , perovskite (structure) , geophysics , mineralogy , thermodynamics , petrology , chemistry , physics , crystallography , organic chemistry
Thermodynamic analysis shows that (Mg,Fe)SiO 3 perovskite is stable throughout the likely pressure, temperature and compositional regime of the Earth's mantle. The breakdown of perovskite to its constituent oxides appears unlikely, even under the extreme conditions of the core‐mantle boundary. This reaction had been proposed to reconcile estimates of silicate melting with seismic observation and proposed geotherms.