Computer Science
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976moon...16..115b&link_type=abstract
The Moon, vol. 16, Dec. 1976, p. 115-150.
Computer Science
4
Basalt, Lunar Composition, Lunar Geology, Lunar Mantle, Lunar Maria, Magma, Aluminum, Fission, Melting, Olivine, Petrology, Phase Diagrams, Pyroxenes, Titanium Oxides
Scientific paper
Available data on mare-basalt samples obtained by the different Apollo and Luna missions are analyzed to determine how many lava flows were sampled at each side, how much differentiation each flow underwent during solidification, and what the original composition of each magma was at the time it erupted. The rock composition data are plotted against the 100 Mg/(Mg+Fe) ratios of the rocks; the normalized normative amounts of plagioclase, pyroxene, olivine, and quartz are plotted on ternary composition diagrams; and the normalized normative amounts of anorthite, olivine, and quartz are plotted on pseudo-ternary diagrams. The pressure dependence of the position of the olivine-pyroxene cotectic on the pseudo-ternary diagrams is examined, and properties of pyroxene-rich and olivine-rich mantle models are compared. It is concluded that: (1) the source region of the mare-basalt magmas is dominated by olivine; (2) the normative composition of a model upper mantle satisfying the various observational constraints is essentially the same as that of earth's mantle; (3) the magmas were produced at depths between 60 and 200 km in the upper mantle; and (4) the degrees of partial melting which produced the magmas range from about 20% for high-Al basalts to about 45% for orange and green glasses. These results are taken as further support for the fission origin of the moon.
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