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Lunar ferroan anorthosites: mineralogy, compositional variations, and petrogenesis

Journal of Geophysical Research

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Abstract

Details petrologic study of a suite of lunar ferroan anorthosites indicates that their mineral compositional variations are generally consistent with derivation of these anorthosites from a common parent magma. Relict textures, zoning, and possible primary trends of mineral compositional variations are preserved in many of the anorthosites. The presence of heterogeneous, bimodal, and/or trimodal pyroxene compositions suggests that some of the anorthosites are polymict rocks. Some aspects of the mineral composition data suggest that complex processes operated during formation of the ferroan anorthosites. 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. -from Author

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Lunar ferroan anorthosites: mineralogy, compositional variations, and petrogenesis
Series title:
Journal of Geophysical Research
Volume
98
Issue:
E5
Year Published:
1993
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Geophysical Research
First page:
9089
Last page:
9105