Petrologic evidence for a plutonic igneous origin of anorthositic norite clasts in 67955 and 77017Clasts of anorthositic norite in 67955 and 77017, and several other samples, are suggested to represent material which crystallized from a silicate magma in a plutonic environment. Although no statement can be made regarding the ultimate origin of the parent melt, its composition was relatively felsic, starting within the primary field of crystallization of either plagioclase or spinel. The sequence of crystallization was: plagioclase (and/or spinel) olivine - low-Ca pyroxene - high-Ca pyroxene.
Document ID
19780062706
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Ashwal, L. D. (Princeton University Princeton, N.J., United States)