Ferroan anorthosite: A widespread and distinctive lunar rock type |
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| Authors: | Eric Dowty Martin Prinz Klaus Keil |
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| Institution: | Department of Geology and Institute of Meteoritics, University of New Mexico, Albuquerque, N. M., USA |
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| Abstract: | Eight of eleven Apollo 16 rake-sample anorthosites are very similar to each other, to hand-specimen Apollo 16 anorthosites, and to Apollo 15 anorthosites. They have feldspar An96.6, both high- and low-Ca pyroxene with a restricted range of (low-magnesium) composition, minor olivine (～ Fo60), traces of ilmenite and chromite, and originally coarse-grained, but now cataclastic texture. Such ferroan anorthosite is evidently a coherent, distinctive and widespread lunar rock type of cumulate origin which may not necessarily be very closely related genetically to other highland rock types. |
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