Other
Scientific paper
Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977rspta.285..285v&link_type=abstract
(Royal Society, Discussion on the Moon - A New Appraisal from Space Missions and Laboratory Analyses, London, England, June 9-12
Other
1
Impact Damage, Lunar Surface, Metamorphism (Geology), Meteoritic Damage, Phase Transformations, Chemical Composition, Glass, Lunar Rocks, Melting, Oxides, Vaporizing
Scientific paper
Chemical changes associated with impact-induced shock melting and shock vaporization on the lunar surface are discussed. Examples where shock-produced melts are observed in direct contact with residual parent material in lunar samples are described, and it is suggested that thermal impact energy is unlikely to be a major factor in the chemical differentiation of lunar rocks by partial melting. Selective vaporization of silicate melts in the vacuum of the lunar surface is investigated, frequency distributions are plotted for the main chemical constituents of 744 lunar rocks and 971 lunar glass samples, and certain variations in the distributions are explained in terms of selective vaporization of alkalis from overheated shock melts. Selective condensation is mentioned as another process by which the chemical composition of parent materials can be changed during impact-induced phase transitions.
Stengelin Rudolf
von Engelhardt Wolf
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