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

Summary: Shock-induced melting of MgSiO3 perovskite and implications for
melts in Earth's lowermost mantle
Joseph A. Akins,1
Sheng-Nian Luo,2
Paul D. Asimow,1
and Thomas J. Ahrens1
Received 12 April 2004; revised 23 June 2004; accepted 2 July 2004; published 30 July 2004.
[1] 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. INDEX
TERMS: 3919 Mineral Physics: Equations of state; 3944 Mineral
Physics: Shock wave experiments; 8124 Tectonophysics: Earth's

  

Source: Asimow, Paul D. - Division of Geological and Planetary Sciences, California Institute of Technology,
Stewart, Sarah T. - Department of Earth and Planetary Sciences, Harvard University

 

Collections: Geosciences; Physics