Shock-Produced Olivine Glass: First Observation

Details Shock-Produced Olivine Glass: First Observation Shock-Produced Olivine Glass: First Observation

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977sci...197..457j&link_type=abstract

Science, Volume 197, Issue 4302, pp. 457-459

Physics

26

Scientific paper

Transmission electron microscope (TEM) observations of an experimentally shock-deformed single crystal of natural peridot, (Mg0.88Fe0.12)2SiO4, recovered from peak pressures of about 56 × 109 pascals revealed the presence of amorphous zones located within crystalline regions with a high density of tangled dislocations. This is the first reported observation of olivine glass. The shocked sample exhibits a wide variation in the degree of shock deformation on a small scale, and the glass appears to be intimately associated with the highest density of dislocations. This study suggests that olivine glass may be formed as a result of shock at pressures above about 50 to 55 × 109 pascals and that further TEM observations of naturally shocked olivines may demonstrate the presence of glass.

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