Two-stage models for lunar and terrestrial anorthosites Petrogenesis without a magma ocean

Physics

Scientific paper

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Anorthosite, Earth Crust, Lunar Crust, Massifs, Petrology, Feldspars, Magma, Planets, Moon, Earth, Models, Anorthosite, Samples, Lunar, Comparisons, Samples, Terrestrial, Petrogenesis, Magma Ocean, Differentiation, Origin, Diapirs, Source, Formation, Parent Material, Dynamics, Melting

Scientific paper

The most popular model of early lunar differentiation is that of a globe-encircling magma ocean tens, if not hundreds, of kilometers deep which produced a floating anorthositic crust and a complementary plagioclase-depleted interior during solidification. Shirley (1983) attempted to show a process by which some of the oldest rocks, lunar ferroan anorthosites (LFA), might have formed from a partially molten 'magma ocean'. The present investigation is concerned with a process by which ferroan anorthosites might have formed without a magma ocean. Attention is given to the magma ocean hypothesis, a hypothesis proposed by Wetherill (1975) regarding a petrogenesis without a magma ocean, two-stage lunar anorthosites, and terrestrial anorthosites.

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