Evidence for shock wave effect of meteoritic impact

Details Evidence for shock wave effect of meteoritic impact Evidence for shock wave effect of meteoritic impact

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991shwav...1...35m&link_type=abstract

Shock Waves (ISSN 0938-1287), vol. 1, March 1991, p. 35-41. MOESC-supported research.

Computer Science

5

Cretaceous-Tertiary Boundary, Hypervelocity Impact, Meteorite Collisions, Planetary Surfaces, Shock Waves, Quartz, Single Crystals

Scientific paper

There is material evidence for the existence of shock waves generated by meteoritic impact, as demonstrated by the pressure and temperature dependent formation processes that exist in the memory of constituent minerals. Stishovite of high-pressure type silica mineral can be observed to be a relict of the compression stage of shock impact. Almost all of the silica minerals evolved from shock impact phenomena are alpha-quartz crystals of a low-temperature type silica polymorph. By using precise measurements of cell parameters and the corresponding calculated density of the quartz crystal grains collected by an ultrasonic cutter method, shocked quartz grains can be interpreted as the principal relict of meteoritic impact from natural impact craters, artificial impact craters and Cretaceous-Tertiary boundary samples.

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