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The phase boundary between CaSiO 3 perovskite and Ca 2 SiO 4 + CaSi 2 O 5 determined by in situ X‐ray observations
Author(s) -
Sueda Yuichiro,
Irifune Tetsuo,
Yamada Akihiro,
Inoue Toru,
Liu Xi,
Funakoshi Kenichi
Publication year - 2006
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 - 10.1029/2006gl025772
Subject(s) - phase boundary , perovskite (structure) , materials science , phase (matter) , synchrotron radiation , mineralogy , diamond , phase transition , titanite , mantle (geology) , geology , crystallography , condensed matter physics , optics , geophysics , physics , geochemistry , chemistry , zircon , quantum mechanics , composite material
The phase transition between CaSiO 3 perovskite and Ca 2 SiO 4 larnite + CaSi 2 O 5 titanite has been investigated using a Kawai‐type multianvil apparatus (KMA) combined with synchrotron radiation. This phase boundary is located by our experiments as P (GPa) = 9.8(4) + 0.0017(3) × T (°C), which is 2–4 GPa lower than the most recent results using laser heated diamond anvil cell and those based on thermodynamic calculations, but is consistent with earlier studies based on quench experiments using KMA. The present results suggest some diamond inclusions recently found in Kankan distinct, Guinea, may originate from depth of 240–360 km in the upper mantle.