Abstract
The molybdenite and scheelite ores are found in the form of vein or impregnation in the pegmatite body of Shimomasaki district, and these were formed in relation to the aplite injection rather than the pegmatite. After the solidification of pegmatite magma the residual part which has been heavily charged with Mo ?? and W components was injected at first as aplitic rock along the boundaries between the quartz mass and the feldspar one in the pegmatite body. The molybdenite and scheelite minerals were, deposited from the dilute acidic solution chiefly into the feldspar mass after the aplitic injection. Next to above ore deposition, alkali solution invaded through the almost same passage with the ore deposition, and metamorphosed the ore body through sericitization and. carbonatization.
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