Physics
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3122601k&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 22, CiteID L22601
Physics
3
Mineral Physics: Elasticity And Anelasticity, Physical Properties Of Rocks: Acoustic Properties, Tectonophysics: Earth'S Interior-Composition And State
Scientific paper
Compressional wave velocities (Vp) of gabbronorite, pyroxene granulite, wehrlite and websterite were measured up to 1000°C at 1 GPa during heating and cooling. The wehrlite and websterite, which contain secondary hydrous minerals, show irreversible change in temperature derivative of Vp (∂Vp/∂T). During heating, these rocks show sudden decrease in Vp when dehydration reactions took place. During cooling, the rocks show a linear increase in Vp. In contrast, the gabbronorite and pyroxene granulite, which are nearly dry crystalline assemblage, show reversible and discontinuous change in ∂Vp/∂T at around 400°C. It changes from -2.4 and -2.1 × 10-4 km s-1 °C-1 to -4.7 and -4.5 × 10-4 km s-1 °C-1. This reversible and discontinuous change in ∂Vp/∂T is difficult to explain by the previously proposed mechanisms, such as thermal cracking, dehydration reaction, and/or partial melting. The data suggest that this reversible and discontinuous change would be associated with phase transition in plagioclase.
Arima Makoto
Ishikawa Masahiro
Kono Yoshio
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