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Science 29 July 1977:
Vol. 197. no. 4302, pp. 457 - 459
DOI: 10.1126/science.197.4302.457
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Articles

Shock-Produced Olivine Glass: First Observation

RAYMOND JEANLOZ 1, THOMAS J. AHRENS 1, J. S. LALLY 2, G. L. NORD JR. 3, J. M. CHRISTIE 4, and A. H. HEUER 5

1 Seismological Laboratory, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena 91125
2 U.S. Steel Research Laboratory, Monroeville, Pennsylvania 15146
3 959 National Center, U.S. Geological Survey, Reston, Virginia 22092
4 Department of Geology, University of California, Los Angeles 90024
5 Department of Metallurgy and Materials Science, Case Western Reserve University, Cleveland, Ohio 44106

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 x 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 x 109 pascals and that further TEM observations of naturally shocked olivines may demonstrate the presence of glass.

Submitted on March 24, 1977
Revised on April 25, 1977


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