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• W1996715909 abstract "Abstract The mineralogical and geochemical characteristics of the Tirschenreuth and Kohdachi kaolin deposits, which both occur in granite, are compared and the genesis of the deposits discussed. The Tirschenreuth deposit (Rappauf pit) is considered to have formed by weathering because: (i) the kaolinite has formed by the alteration of plagioclase and biotite, whereas microcline and muscovite are unaltered; (ii) the kaolin body has a very homogeneous composition and alteration zones cannot be recognized; (iii) there has been no addition of trace elements from sources other than plagioclase and biotite in the parent rock; (iv) particle-size distribution shows that the kaolinite crystals grew under uniform physical conditions; (v) quartz grains have smooth surfaces. The Kohdachi deposit contains many clay veins and three alteration zones: (i) halloysite with weak silicification; (ii) halloysite-kaolinite; (iii) kaolinite. Many large dissolution pits were observed by SEM on the surface of quartz crystals from the kaolin zone. Silicification, precipitation of goethite at the border of zones (ii) and (iii), and dissolution of quartz in different areas of the deposit indicate a variable pH within a distance of <100 m. The Cu and Li contents in the <2 µ m fractions of the Kohdachi kaolin samples are markedly higher than those at Tirschenreuth. From hydrogen isotopic analysis, the formation temperature of the Kohdachi kaolinite may be roughly estimated at 70–150°C. It is suggested that the Kohdachi deposit formed by hydrothermal alteration." @default.
• W1996715909 created "2016-06-24" @default.
• W1996715909 creator A5016830837 @default.
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• W1996715909 date "1991-03-01" @default.
• W1996715909 modified "2023-09-23" @default.
• W1996715909 title "Genesis of the Tirschenreuth kaolin deposit in Germany compared with the Kohdachi kaolin deposit in Japan" @default.
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• W1996715909 doi "https://doi.org/10.1180/claymin.1991.026.1.07" @default.
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