Host: Japan Association of Mineralogical Sciences
Allanite means the minerals belongs to epidote group-allanite subgroup, mainly allanite-(Ce) [CaCeAl2FeSi3O12(OH)2]
This study sums up the chemical composition of allanite from Ryoke granitoids, Cape Ashizuri granitoids, and Ohkueyama granitoids.
Allanite from ryoke and Hiroshima granite is allanite-(Ce), and later is rich in Y, MREE, and HREE.
Allanite from Ryoke pegmatite is identified as allanite-(Ce), Uedaite-(Ce), and allanite-(Y).these are subdevided into two type based on REE pattern.
Allanite from Cape Ashizuri granite is poorer in La, MREE, and HREE than one from Cape Ashizuri syenite aand rapakivi granite.
Because of feldspar crystalization, allanite becomes rich in Y,MREE, and HREE.
Allanite from Ohkueyama pegmatite is identified as allanite-(Ce), and poorer in Y, MREE, and HREE than one from Ryoke pegmatite.
