Olivine-Pyroxene-H2O system as a practical analogue for estimating the elastic properties of fluid-bearing mantle rocks at high pressures and temperatures

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 H2O fluid in mantle rocks have been determined at high pressure and temperature, a...

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Bibliographic Details
Published inGeophysical research letters Vol. 29; no. 9; pp. 39-1 - 39-4
Main Authors Sato, Hiroki, Ito, Kazuhiko
Format Journal Article
LanguageEnglish
Published American Geophysical Union 01.05.2002
Blackwell Publishing Ltd
Subjects
Acoustic properties
Elasticity and anelasticity
Lithosphere and upper mantle
Mathematical Geophysics
Mineral Physics
Numerical solutions
Physical Properties of Rocks
Seismology
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Summary: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 H2O fluid in mantle rocks have been determined at high pressure and temperature, and are used to estimate Vp and Vs in the olivine‐pyroxene‐H2O system. Importantly, velocities calculated for the peridotite‐H2O system successively reproduce the absolute Vp and Vs values measured in the laboratory for dehydrated serpentinite. Known equilibrium distributions of H2O‐CO2 fluid in peridotite‐liquid systems allow one to estimate elastic properties of fluid‐bearing mantle rocks from mineral and liquid elasticity data.
Bibliography:istex:BB307A46E2E91D58BCB1DAE745F57637B8F758B5
ark:/67375/WNG-4HT7B3H6-4
ArticleID:2001GL014212
ISSN:0094-8276
1944-8007
DOI:10.1029/2001GL014212