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By Toshio Sudo

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6-1' ... '7 . B 0 45 ; ; . >... .. . . A '"7 I I I ....... . I I I I I . :,>. '. 0:. ,' ' bi. No. 6-2 100 . 60 40 -2-1 0 1 2 3 4 5 Velocity (rnm/sec) Fig. 13. Mossbauer spectra for the clay altered from volcanic rock fragments in Oya-ishi (Kohyama, Shimoda and Sudo, 1973). 6-1) Unoxidizedsample. 6-1') Partially oxidized sample. 6-2) Oxidized sample. 7. Using EPMA, chemical analysis was performed on the two different parts, Types I and 11. The chemical formula of Type I in the primary state was obtained as (NaO.

B. Distribution of the dominant clay minerals in the clays or clayrocks. Open circles-Kaolin, mostly dickite; double circles-Pyrophyllite; A-Montmorillonite; squuresSericite, illite; solid circles-Mixed layered minerals. C. Lateral mineral variation in amount along the principal adit of the Yonago Roseki deposit, Nagano Prefecture (Sudo, Hayashi, and Shimoda, 1962). D: Diaspore. P: Pyrophyllite. Q: Quartz. K: Kaolinite. The upper figure @,P) shows the total amount of diaspore and pyrophyllite; the blackcolored area at the left-hand side is largely composed of diaspore, and the black-colored area at the right-hand side is largely composed of pyrophyllite.

The latter undoubtedly involves sedimentation processes, hydrothermal alteration diagenesis, and combinations of these processes. Iwao, Kishimoto and Takahashi (1954) first performed mineralogical and geological studies on the wall rock alteration of the deposits in the Kosaka mine. Iwao (1956) also studied the wall rock alteration of the Wanibuchi Kurokotype gypsum deposit. 3), comprising chiefly pyrophyllite, kaolinite and diaspore (Sudo and Hayashi, 1955, 1956a, 1957; Sudo, Hayashi and Yokokura, 1958).

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