An experimental study on felsic rock–artificial seawater interaction: implications for hydrothermal alteration and sulfate formation in the Kuroko mining area of Japan |
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Authors: | Yasumasa Ogawa Naotatsu Shikazono Daizo Ishiyama Hinako Sato Toshio Mizuta |
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Affiliation: | (1) Department of Applied Chemistry, Faculty of Science and Technology, Keio University, Hiyoshi3-14-1, Kohoku-ku, Yokohama Kanagawa Prefecture, 223-8522, Japan;(2) Division of Applied Earth Science, Department of Earth Science and Technology, Faculty of Engineering and Resource Science, Akita University, Tegatagakuen-machi1-1, Akita Akita Prefecture, 010-8502, Japan |
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Abstract: | Experimental studies on the interactions between artificial seawater (ASW) and fresh rhyolite, perlite and weakly altered dacitic tuff containing a small amount of smectite suggest changing cation transfer during smectite-forming processes. Initially, dissolution of K from the rocks accompanies incorporation of Mg and Ca from ASW during both earlier (devitrification stage) and later smectite formation, whereas Ca incorporated with early smectite formation redissolves with progressive reaction. Barium mobility increases toward the later smectite-forming reactions. Therefore, the large amounts of barite, anhydrite and gypsum in Kuroko ore deposits are considered to have precipitated from hydrothermal solutions derived from the interaction with previously altered felsic rocks during late smectite formation, rather than by the reaction with fresh felsic rocks.Editorial handling: D. Lentz |
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Keywords: | Kuroko deposits Felsic rocks Smectite Hydrothermal alteration Sulfate minerals |
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