Abstract
The Tono Mine, Gifu Prefecture is one of the richest sedimentary uranium deposits in Japan. This areas is mainly composed of Tertiary system overlying granite basement. Uranium has been deposited in the lower part of the Tertiary sediments, Mizunami Group, and its location is controlled by the socalled channel structure of the surface of the basement granites. The matrixes of these sediments usually contain tuffaceous materials, which have been argillized and zeolitized diagenetically, and uranium was absorbed in clinoptilolite. The clay mineral species and their relative amounts are closely related to the redox potential and hydrogen ion concentration of the deposits, which are controlled by the movement of groundwater. Main authigenic minerals are montmorillonite, kaolinite, halloysite, sericite and clinoptilolite. In an S-N gallery, the amount of montmorillonite regularly decreases with increasing amount of kaolin minerals and uranium contents. Some iron minerals and calcium minerals are closely associated with clay minerals, zeolite and uranium contents, so the stability relation of their minerals and mineral paragenesis suggest the environments of alteration in this area.
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