Computer Science
Scientific paper
Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977rspta.285..417b&link_type=abstract
(Royal Society, Discussion on the Moon - A New Appraisal from Space Missions and Laboratory Analyses, London, England, June 9-12
Computer Science
1
Hydrogen Isotopes, Lunar Composition, Oxygen Isotopes, Silicon Isotopes, Earth-Moon System, Geochemistry, Solar Protons, Water
Scientific paper
Some studies of hydrogen, oxygen, and silicon isotope abundances in lunar material are reviewed. Attention is given mainly to isotopic evidence relating to the origin of the water in lunar samples, the large variations in oxygen and silicon isotope abundances associated with regolith grain surfaces, temperatures recorded in crystalline rocks by O-18 partition between coexisting phases, and the origin of the moon. It is concluded that: (1) the bulk of the hydrogen in typical lunar materials is contained in soil samples, represents implanted solar-wind protons, and is essentially deuterium-free; (2) rare cases of relatively deuterium-rich hydrogen probably result from in situ spallation reactions; (3) the water in lunar samples is probably entirely terrestrial in origin; (4) O-18 and Si-30 enrichments in regolith grain surfaces probably result from vaporization of grain-surface material, condensation on grain surfaces, or both; (5) temperatures derived from O-18 partition generally agree with experimentally determined liquidus temperatures; and (6) the earth-moon system had a completely different origin than the higher-temperature condensates in chondritic meteorites.
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