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Evidence of denser MgSiO3 glass above 133?gigapascal (GPa) and implications for remnants of ultradense silicate melt from a deep magma ocean

  1. Jay D. Bassb
  1. aDepartment of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan; and
  2. bDepartment of Geology, University of Illinois, 1301 West Green Street, Urbana, IL 61801
  1. Edited by David Walker, Columbia University, Palisades, NY, and approved August 31, 2011 (received for review June 16, 2011)

  1. Fig. 1.

    High-pressure Brillouin spectra at 45?GPa (A) and 203?GPa (B). TA: transverse acoustic mode of MgSiO3 glass.

  2. Fig. 2.

    Transverse acoustic wave velocities of MgSiO3 glass (gray circles) as a function of pressure up to 203?GPa. The white circles indicate the results on SiO2 glass by Murakami and Bass (16). The velocity trajectories for the distinct pressure regimes are shown as blue, green, and orange lines with increasing pressure. Numbers indicate the potential Si-O coordination number within each pressure regime. Approximate pressure boundary for each Si-O coordinated structure are shown as the vertical dot lines. Error bars are ±?1σ from mean.

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