Abstract
Hugoniot measurements on iron-silicate garnet (Fe 0.79, Mg 0.14, Ca 0.04, Mn 0.03) 3 Al 2Si 3O 12 initial density 4.18 g/cm 3, demonstrate that above a shock pressure of205 ± 20kbar transition to a high-pressure phase(s), having an apparent zero-pressure density and bulk modulus of4.44 ± 0.06g/cm 3and3.3 ± 0.3Mbar, occurs. Crystal chemical systematics and Debye-Scherrer X-ray patterns of a recovered phase(s), which may be the shock-induced high-pressure form, suggest possible formation of a phase with a density of∼ 4.48/cm 3. Occurrence of such a polymorph of garnet in the mantle would give rise to an increase in density and seismic velocity below ∼ 600km in the earth.
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