title: PLAGIOCLASE OF INTRUSIVE ROCKS FROM THE ISLANDARC PERVOMAY-AYUDAG COMPLEX (MOUNTAIN CRIMEA) - FROM PLAGIOLERZOLITES TO PLAGIOGRANITES
abstract: The Middle Jurassic hypabyssal island-arc pervomay-ayudag intrusive complex includes plagiolerzolites, olivine gabbro-norites, quartz gabbro-norites, quartz gabbro-norite- diorites, quartz diorites, plagiogranites. Ultramafic and mafic rocks contain anorthite (An92-90) and bytownite (An89-73). Plagiogranites containing andesine and oligoclase, up to albite-oligoclase (An19-9). This composition of plagioclase is typical for island-arc rocks. Due to the abundance of anorthite and bytownite, which 
journal: Moscow University Bulletin Series 4 Geology