Host: Japan Association of Mineralogical Sciences
Anorthite megacrysts in basaltic andesite from Mt. Fubo, Miyagi Prefecture were examined by EPMA-WDS and SEM-EDS. These observations revealed that anorthite contents of the megacrysts are An92-94 and small Fe-Ni-sulfides (20-50µm) were included in the megacrysts. Our results indicate that these megacrysts have grown in volatile (e.g., H2O and S) rich and low viscosity condition.