Computer Science
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..52...55v&link_type=abstract
Earth and Planetary Science Letters, vol. 52, no. 1, Jan. 1981, p. 55-66. Research supported by the Deutsche Forschungsgemeinsc
Computer Science
3
Chemical Composition, Glass, Igneous Rocks, Lunar Rocks, Mineralogy, Selenology, Frequency Distribution, Space Exploration, Tables (Data), Data, Crystalline Rocks, Origin, Distribution, Microprobe Analysis, Optical Properties, Samples, Lunar, Moon, Glasses, Composition, Classification, Igneous Rocks, Major Elements, Analysis, Impacts, Clinopyroxenes, Plagioclase, Orthopyroxenes, Olivines, Chemistry, Apollo Missions, Luna Missions, Landing Sites, Fusion, Comparisons, Concentrations, Volatilization, Temperatu
Scientific paper
Major element analyses in the literature of lunar glasses are compiled and used in the definition of glass groups based on normative and chemical compositions. Rittman norms were calculated for 1499 major element analyses of individual clear glass particles, and represented in quartz-plagioclase-orthopyroxene and olivine-plagioclase-orthopyroxene triangles according to normative clinopyroxene contents. Although lunar glasses are observed to form a more continuous distribution of normative compositions than lunar rocks, the glass continuum could be divided into 11 groups according to apparent clusters in the diagrams and the six lunar rock groups identified previously. The frequencies of the rock and glass groups at the Apollo and Lunar landing sites are illustrated, and the abundances of chemically corresponding groups are shown to be similar, suggesting genetic relationships. Glass groups most likely originating from the impact fusion of chemically corresponding rocks possibly with alkali volatilization, most likely of volcanic origin are also distinguished.
Stengelin Rudolf
von Engelhardt Wolf
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