Petrogenesis of mare basalts - A record of lunar volcanism

Details Petrogenesis of mare basalts - A record of lunar volcanism Petrogenesis of mare basalts - A record of lunar volcanism

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.2177n&link_type=abstract

(Geological Society of America, Workshop on Mare Volcanism and Basalt Petrogenesis, Dallas, TX, Oct. 27, 28, 1992) Geochimica et

Mathematics

Logic

53

Aluminum Compounds, Basalt, Lunar Maria, Petrology, Titanium Oxides, Volcanology, Apollo Lunar Experiment Module, Apollo Spacecraft, Crystallization

Scientific paper

The classification, sources, and overall petrogenesis of mare basalts are reviewed. All mare basalt analyses are used to define a sixfold classification scheme using TiO2 contents as the primary division. A secondary division is made using Al2O3 contents, and a tertiary division is defined using K contents. Such divisions and subdivisions yield a classification containing 12 categories, of which six are accounted for by the existing Apollo and Luna collections. A variety of postmagma-generation such as fractional crystallization, either alone or combined with wallrock assimilation, are invoked to explain the compositional ranges of the various mare basalt suites. High-Ti mare basalts are found at Apollo 1 and Apollo 17 sites; the A-11 basalts contain lower TiO2 abundances, a considerably larger range in trace-element contents, and the only occurrence of high-Ti/high-K mare basalts. The low-Ti basalts exhibit a wide range of major-and trace-element compositions and require source heterogeneity, fractional crystallization, and some assimilation.

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