Shock-induced melting of MgSiO3 perovskite and implications for melts in Earth's lowermost mantle

Details Shock-induced melting of MgSiO3 perovskite and implications for melts in Earth's lowermost mantle Shock-induced melting of MgSiO3 perovskite and implications for melts in Earth's lowermost mantle

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3114612a&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 14, CiteID L14612

Physics

23

Mineral Physics: Equations Of State, Mineral Physics: Shock Wave Experiments, Tectonophysics: Earth'S Interior-Composition And State

Scientific paper

New shock wave equation of state (EOS) data for enstatite and MgSiO3 glass constrain the density change upon melting of Mg-silicate perovskite up to 200 GPa. The melt becomes denser than perovskite near the base of Earth's lower mantle. This inference is confirmed by shock temperature data suggesting a negative pressure-temperature slope along the melting curve at high pressure. Although melting of Earth's mantle involves multiple phases and chemical components, this implies that the partial melts invoked to explain anomalous seismic velocities in the lowermost mantle may be dynamically stable.

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