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(1)Shiga University. ¬­¹ º»¼ No. , pp.  ῌ , .

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(3)    *      **      ***. Hydrothermal Alteration in the Tanakami Granite Pluton, Shiga Prefecture, Southwest Japan Satoshi NAKANO, Norihiro YOSHIMI and Katsutoshi TOMITA. Abstract The hydrothermal alteration of the Tanakami mediumῌ to coarseῌgrained biotite granite has been studied in the Kumoi mine, Koka city, Shiga prefecture, Japan, by the field observations, microscopic observations and powder Xῌray diffraction analyses. As the results, it has been clarified that the hydrothermal alteration of its constituent minerals are sericitization and clayῌmineral formation, and extremely feldspathization syenitization including albitization and Kῌfeldspathization with quartz dissolution, and that the color variation of biotite to the naked eye is a useful tool for the field mapping of hydrothermally altered granites. Using the color varition of biotite, field observations were made to clarify the distribution pattern of hydrothermally atered granites over the area of the Tanakami granites.. 2k2kU  V 2kT$U  V l mU ῎ ῌ ῏ ῍. 1 BGQWP )nC,-op+ M pqMN)r,Q DR-I.  !". a

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(195) cdefgh =i)2'.>j?gh=kl@,B Am8J Bmnop5  3qrI s Am C>tu D vI ῌ ῑ ῐ ῍ EFwGx  Cooling histories of feldspars in the Tanakami and Shigaraki granites from the southeast to Lake Biwa, Japan, cdyozyHI{9JK |G Asayama, T  Radium content and chemical composition of granitic rocks in Japan, especially in the TanakamiῌMikumo and Hiei regions, Shiga and Kyoto Prefectures. Mem. Fac. Ind. Arts, Kyoto Tech. Univ., Sci. & Tech.,  K BK  ῌ . KL}~MST€  KL}%+&‚ ƒST„ KL}NO †PSTQ‡Rˆ SK p. . Brown, W. L. and Parsons, I.  Exsolution and coarsening mechanisms and kinetics in an ordered cryptoperthite series. Contri-. butions to Mineralogy and Petrology,  ,  ῌ . Brown, W. L. and Parsons, I.  Alkali feldspars : ordering rates, phase transformations and behavior diagrams for igneous rocks. Mineral. Mag. ,  ῌ . Brown, W. L. and Parsons, I.  Feldspars in igneous rocks : Parsons, I. ed. Feldspars and their reactions. NATO ASI Ser. C ,  ῌ . Dana, E. S. and Ford, W. E.  A textbook of mineralogy,  th edition, Modern Asia edition, Jhon Wiley & Sons Inc.,  pp. T0U‰   cde %„ cdeŠV cdeŠVW‹ŒXK  ῌ  . 0Ž.YWZ.[  A :+%‘\]^M’‚ƒ„ XO“yK ,  ῌ . ” •_   –V/ y`ST„ cdyozyHag9J |G —˜.bcd  KL}eHK ™š)› œf 

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(199) ·’  „  %\ ¸€¹·¢“yK ,   ῌ  . Lee, M. R, Waldron, K. A. and Parsons, I.  Exsolution and alteration microtextures in alkali felsdspar phenocrysts from the Shap granite. Mineral. Mag. ,  ῌ . Lee, M. R. and Parsons, I.   Dislocation formation and albitization in alkali feldspars from the Shap granite. Am. Mineral. ,  ῌ  . Le Maitre, R. W.  A classification of igneous rocks and glossary of terms. Blackwell Sci. Public.,  pp. London, D.  The application of experimental petrology to the genesis and crystallization of granitic pegmatites. Canad. Mineral., ,  ῌ .. NII-Electronic Library Service.

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