摘要: Publisher Summary Anorthosite massifs (up to 1000s of km 2 in area) appear represent a unique magmatic episode the mid-Proterozoic. They have many characteristics that distinguish them from intrusive complexes emplaced either Archean or Phanerozoic. Of primary importance is dominance massive weakly layered anorthositic plutons containing between 75% and 95% plagioclase intermediate composition. Within these plutons, orthopyroxene olivine with compositions are most common mafic minerals. The rocks characteristically very coarse-grained unzoned zoned subhedral commonly 1 10 cm rarely up m length. Although contain large volumes associated granitic rocks, (including gabbroic intrusions) comprise more than 10%. Some massif anorthosite Fe- Ti-rich diorites jotunites; Fe-Ti oxide deposits complexes. Ultramafic essentially absent except for small isolated bodies oxide-rich cumulates rocks.
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