In situ measurements of sound velocities and densities across the orthopyroxene --> high-pressure clinopyroxene transition in MgSiO3 at high pressure

Details In situ measurements of sound velocities and densities across the orthopyroxene --> high-pressure clinopyroxene transition in MgSiO3 at high pressure In situ measurements of sound velocities and densities across the orthopyroxene --> high-pressure clinopyroxene transition in MgSiO3 at high pressure

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pepi..147...27k&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 147, Issue 1, p. 27-44.

Physics

24

Scientific paper

Using acoustic measurement interfaced with a large volume multi-anvil apparatus in conjunction with in situ X-radiation techniques, we are able to measure the density and elastic wave velocities (VP and VS) for both ortho- and high-pressure clino-MgSiO3 polymorphs in the same experimental run. The elastic bulk and shear moduli of the unquenchable high-pressure clinoenstatite phase were measured within its stability field for the first time. The measured density contrast associated with the phase transition OEN --> HP-CEN is 2.6-2.9% in the pressure of 7-9GPa, and the corresponding velocity jumps are 3-4% for P waves and 5-6% for S waves. The elastic moduli of the HP-CEN phase are KS=156.7(8)GPa, G = 98.5(4)GPa and their pressure derivatives are KS'=5.5(3) and G' = 1.5(1) at a pressure of 6.5GPa, room temperature. In addition, we observed anomalous elastic behavior in orthoenstatite at pressure above 9GPa at room temperature. Both elastic wave velocities exhibited softening between 9 and 13-14GPa, which we suggest is associated with a transition to a metastable phase intermediate between OEN and HP-CEN.

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