Lunar volcanic glasses and their constraints on mare petrogenesis

Details Lunar volcanic glasses and their constraints on mare petrogenesis Lunar volcanic glasses and their constraints on mare petrogenesis

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45.2137d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 45, Nov. 1981, p. 2137-2149.

Mathematics

Logic

29

Glass, Lunar Composition, Lunar Exploration, Lunar Maria, Petrology, Volcanology, Abundance, Apollo 11 Flight, Apollo 14 Flight, Basalt, Chemical Composition, Electron Probes, Lunar Core, Lunar Landing Sites, Mathematical Models

Scientific paper

The compositional properties of volcanic glasses from the Apollo 11, 14, 15 and 16 landing sites are examined and implications of the results for mare basalt petrogenesis and deep lunar structures are discussed. Major-element and nickel analyses were performed on the glasses using electron probe techniques, and R-mode principal component analysis was performed on the 19 different compositions of glass distinguished. The glasses are found to form two distinct chemical arrays based on the major elements and Ni. The presence of two chemically isolated cumulate systems in the mantle at different depths is thus inferred, and a model is developed for mare petrogenesis in which each system was itself composed of two lithologic components that underwent hybridization, assimilation or mixing to generate the large compositional range of magmas represented by the lunar volcanic glasses. The surface-correlated elements associated with the volcanic glasses are attributed to another reservoir in the deep interior which may be responsible for gas emissions causing lunar transient phenomena. The model developed allows predictions to be made concerning the liquidus phase relations, trace and radiogenic element distributions, nonradiogenic isotope compositions and sample ages.

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