Laboratory measurements of P- and S-wave velocities in polycrystalline plagioclase and gabbronorite up to 700 °C and 1 GPa: Implications for the low velocity anomaly in the lower crust

Details Laboratory measurements of P- and S-wave velocities in polycrystalline plagioclase and gabbronorite up to 700 °C and 1 GPa: Implications for the low velocity anomaly in the lower crust Laboratory measurements of P- and S-wave velocities in polycrystalline plagioclase and gabbronorite up to 700 °C and 1 GPa: Implications for the low velocity anomaly in the lower crust

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3315314k&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 15, CiteID L15314

Physics

3

Mineral Physics: Elasticity And Anelasticity, Physical Properties Of Rocks: Acoustic Properties, Tectonophysics: Earth'S Interior: Composition And State (1212, 7207, 7208, 8105), Tectonophysics: Tomography (6982, 7270), Tectonophysics: Volcanic Arcs

Scientific paper

P- (Vp) and S-wave (Vs) velocities of polycrystalline plagioclase (An51+/-1) and gabbronorite including plagioclase (An49+/-2) (62.3vol.%) were measured up to 700°C at 0.6, 0.8, and 1.0GPa during heating and cooling. Both polycrystalline plagioclase and gabbronorite show reversible and discontinuous change in temperature derivative of Vp and Vs, ∂Vp/∂T and ∂Vs/∂T, respectively, at about 400°C. The ∂Vp/∂T and ∂Vs/∂T of the polycrystalline plagioclase changes from -0.8 × 10-4 to -3.4 × 10-4 km s-1°C-1 and from -1.1 × 10-4 to -3.3 × 10-4 km s-1°C-1, respectively. The ∂Vp/∂T and ∂Vs/∂T of the gabbronorite varies from -1.0 × 10-4 to -3.4 × 10-4 km s-1°C-1 and from -0.4 × 10-4 to -3.5 × 10-4 km s-1°C-1, respectively. The reversible and discontinuous changes in ∂Vp/∂T and ∂Vs/∂T are attributed to a phase transformation of plagioclase. The present data suggest that the sharp decrease in Vp and Vs would cause low velocity anomaly under dry and subsolidus melt-absent conditions in the mid-to-lower crust of relatively high heat flow regions.

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