Abstract
Ultramafic xenoliths occur in the Cenozoic alkali basalt from Kawashimo, Shimane Prefecture, SW Japan. These xenoliths are divisible into two Types, A and B, in terms of petrography. Ultramafics of Type A are derived from the mantle peridotite. They are characterized by the metamorphic textures and higher Mg/Mg+Fe ratios and equilibrium temperatures of constituent minerals. They consist of lherzolite, harzburgite and wehrlite. Ultramafic xenoliths of Type B are of cumulus mantle origin and show the cumulus and exsolution textures. They are composed of lherzolite, pyroxenite, websterite and dunite. Assembleage of ultramafic xenoliths are similar to those from Noyamadake and Kibi-kogen, but the constituent minerals from Kawashimo xenoliths have higher Mg/Mg+Fe than those from the others.
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