Normative composition and classification of lunar igneous rocks and glasses. II - Lunar glasses

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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.

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