Shock temperatures in silica glass: Implications for modes of shock‐induced deformation, phase transformation, and melting with pressure

Authors:
  • DSDouglas R. Schmitt
    Douglas R. Schmitt
  • TAThomas J. Ahrens
    Thomas J. Ahrens
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Abstract
Gray body temperatures and emittances of silica glass under shock compression between 10 and 30 GPa are determined. Observed radiative temperatures are higher than computed continuum temperatures for shock‐compressed silica glass; however, below ∼26 GPa observed emittances are 2–Mg2SiO4 are considered together with the proposed stishovite melting curve and suggested maximum solidus temperatures within the mantle of ∼2370 K at 12.5 GPa and ∼2530 K at 20.0 GPa. Using the proposed stishovite melting temperatures Tm and estimates of upper mantle temperatures T, the effective viscosity, which can be considered a function of the homologous temperature T/Tm, appears to remain nearly constant from 200 to 600 km depth in the Earth.

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