Computer Science
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..329e&link_type=abstract
Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 329.
Computer Science
1
Chondrites, Alkali Metals, Metal Vapors, Shock Loads, Glass, Crystal Structure, High Pressure, Stoichiometry, Minerals
Scientific paper
Smooth grains in the Peace River shocked matrix previously described as maskelynite are not diaplectic glass but a crystalline phase with a stoichiometric composition. They formed upon decompression by inversion of a parental high-pressure polymorph that crystallized from a dense K-rich melt. They are surrounded by radiating cracks that have extensively shattered the neighboring minerals due to volume increase induced by decompression. Similar grains in Tenham turned out to be glass-quenched from a dense alkali-rich melt compositionally unrelated to plagioclase. Expansion of the alkali-bearing aluminosilicate in Peace River and the quenched dense glass in Tenham triggered the second high-pressure event. Neither Peace River nor Tenham contain any maskelynite.
Chen Michelle
El Goresy Ahmed
Sharp Thomas G.
Weinbruch Stephan
Wopenka Brigitte
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