11:30 AM - 11:45 AM
[R7-08] Formation of anorthite megacrysts from their inclusions in the Mt. Kayo, Oguro lava in Akita Prefecture
Keywords:Anorthite, Mt Kayo, EPMA, Chemical zoning, Crystal growth
Anorthite megacrysts with a maximum length of about 3 cm occur in the Oguro lava of Mt.Kayo in Senboku City Akita Prefecture. In this study, examined mineralogical characteristics of the anorthite metacysts from Mt.Kayo and the formation of anorthite megacrysts.
The inclusion of pyroxene in some of the mafic crystals suggests that the pyroxene crystallized before the anothite under relatively high pressure, and then the anothite crystallized under conditions outside the pyroxene stability conditions, as suggested by the numerical experiments by Bindeman & Bailey (1999).
The inclusion of pyroxene in some of the mafic crystals suggests that the pyroxene crystallized before the anothite under relatively high pressure, and then the anothite crystallized under conditions outside the pyroxene stability conditions, as suggested by the numerical experiments by Bindeman & Bailey (1999).