Permalink : http://hdl.handle.net/2115/36698

Calc silicate xenoliths from the Yatsugatake Volcanic Chain have representative mineral assemblage of Ti-garnet + fassaitic pyroxene + anorthite + sphene ± iron ores ± vesuvianite ± wollastonite ± corundum ± calcite. Garnet is schorlomite (TiO2 = 11.87 wt %) with the formula of Ca2.85 Mn0.02 Fe0.39^2+ Mg0.12 Fe0.74^3+ Al0.61 Ti0.74 Si2.52 O12, Chemical composition of fassaitic pyroxene shows a range between Ca0.98 Fe0.03^2+ Mg0.48. Fe0.33^3+ Ti0.06 Al0.57 Si1.52 O6, and Ca1.00 Fe0.26^2+ Mn0.01 Mg0.37 Fe0.27^3+ Ti0.05 Al0.45 Si1.60, O6. Unit-cell dimension for schorlomite is determined, a=12.046Å. Genesis of the xenoliths is briefly discussed.