Lunar ferroan anorthosites - Mineralogy, compositional variations, and petrogenesis

Details Lunar ferroan anorthosites - Mineralogy, compositional variations, and petrogenesis Lunar ferroan anorthosites - Mineralogy, compositional variations, and petrogenesis

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.9089m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E5, p. 9089-9105.

Physics

12

Anorthosite, Chemical Composition, Lunar Rocks, Petrology, Crystallization, Magma, Pyroxenes, Scanning Electron Microscopy, Textures, Moon, Anorthosites, Mineralogy, Composition, Petrogenesis, Pyroxene, Samples, Lunar, Laboratory Studies, Parent Material, Magma, Formation, Origin, Major Elements, Minor Elements, Texture, Zoning, Plagioclase, Lithology, Crystallization, Mixing, Trapping, Distribution, Clasts, Iron Oxide, Magnesium Oxide, Procedure, Ferroan Material, Description, Electron Microscopy, Sem, 154

Scientific paper

Results of a study of 16 samples from the anorthositic ferroan subgroup, or 'typical' ferroan anorthosites, are reported. The presence of heterogeneous, bimodal, and/or trimodal pyroxene compositions suggests that some of the anorthosites are polymict rocks; however, they are composed entirely of ferroan-anorthosite-suite lithologies. It is suggested that complex processes operated during the formation of the ferroan anorthosites. It is argued that original igneous compositional characteristics were altered during and/or after crystallization. Processes operative during anorthosite formation may have included some mixing of different melts, trapping of variable amounts of intercumulus liquid, postcrystallization redistribution of elements, or perturbations both during adcumulus growth and subsequent to crystallization by impact events.

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