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.
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Acknowledgements
The authors thank Prof. O. Matsubaya (Akita University) for use of the autoclaves in his laboratory, and Prof. D. Lentz (University of New Brunswick) Dr. R.A. Binns (CSIRO), and Prof. B. Lehmann (Technical University of Clausthal) for valuable advice on this manuscript. T. Ogata (Hokkaido University) and K. Watanabe (Akita University) and H. Kashiwagi (Keio University) are thanked for their support and assistance with sample analysis.
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Ogawa, Y., Shikazono, N., Ishiyama, D. et al. An experimental study on felsic rock–artificial seawater interaction: implications for hydrothermal alteration and sulfate formation in the Kuroko mining area of Japan. Miner Deposita 39, 813–821 (2005). https://doi.org/10.1007/s00126-004-0454-8
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DOI: https://doi.org/10.1007/s00126-004-0454-8