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Olivine‐Pyroxene‐H 2 O system as a practical analogue for estimating the elastic properties of fluid‐bearing mantle rocks at high pressures and temperatures
Author(s) -
Sato Hiroki,
Ito Kazuhiko
Publication year - 2002
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 - 10.1029/2001gl014212
Subject(s) - peridotite , olivine , pyroxene , mantle (geology) , geology , mineralogy , elasticity (physics) , thermodynamics , geochemistry , physics
By using Grüneisen theory and third‐order finite strain theory, elastic‐wave velocities in olivine‐pyroxene assemblages are accurately determined as a function of pressure and temperature. Equilibrium distributions of H 2 O fluid in mantle rocks have been determined at high pressure and temperature, and are used to estimate Vp and Vs in the olivine‐pyroxene‐H 2 O system. Importantly, velocities calculated for the peridotite‐H 2 O system successively reproduce the absolute Vp and Vs values measured in the laboratory for dehydrated serpentinite. Known equilibrium distributions of H 2 O‐CO 2 fluid in peridotite‐liquid systems allow one to estimate elastic properties of fluid‐bearing mantle rocks from mineral and liquid elasticity data.