記載データ入力型の最小二乗計算プログラム“SeleMo-Calc”の開発

SeleMo-Calc is a GUI (Graphic User Interface) computer program developed for estimating the proportions of melting and fractionating minerals during magmatic processes, and to reveal detailed modal composition of rocks. The SeleMo-Calc provides the calculated result including petrographic information. Inclusion in alkali basalt from Oki-Dogo island is used to illustrate the method of calculation. The calculated mineral proportions are all positive values, indicating realisticmodal composition for the inclusion. Furthermore, application to fractional crystallization from shoshonite magma to trachyte magma is reported in this paper. The calculated bulk distribution coefficients of Yttrium for fractionated mineral assemblage indicate possible range in the magma process.