In-situ elasticity measurement for the unquenchable high-pressure clinopyroxene phase: Implication for the upper mantle

Details In-situ elasticity measurement for the unquenchable high-pressure clinopyroxene phase: Implication for the upper mantle In-situ elasticity measurement for the unquenchable high-pressure clinopyroxene phase: Implication for the upper mantle

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3201307k&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 1, CiteID L01307

Physics

8

Geochemistry: Composition Of The Mantle, Mineral Physics: Elasticity And Anelasticity, Mineral Physics: Equations Of State, Mineral Physics: High-Pressure Behavior, Mineral Physics: X-Ray, Neutron, And Electron Spectroscopy And Diffraction

Scientific paper

Polycrystal elasticity of the unquenchable MgSiO3 high-pressure clinoenstatite has been measured using ultrasonic interferometry in conjunction with in-situ X-ray diffraction and imaging techniques within its stability field in a large volume multi-anvil apparatus for the first time. At 6.5 GPa, we obtained ∂KS/∂P = 5.6(3), ∂G/∂P = 1.5(1), ∂KS/∂T = -0.017(1) GPa K-1 and (∂G/∂T) = -0.015(1) GPa K-1. Our results show that the elastic velocities of HP-CEN are not only higher than those of OEN but also higher than olivine at upper mantle conditions. According to these new data, the elastic velocities for the ``depleted'' mantle composition, with ~20 vol% of HP-CEN, would result in ~0.8% and ~1.6% in difference for P and S waves, respectively, when OEN data were used in previous calculations. Newly measured results also suggest that it is possible to distinguish ``undepleted'' and ``depleted'' composition models in the upper mantle.

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