By Naotatsu Shikazono
Many Neogene hydrothermal ore deposits were shaped on and close to the japanese islands from the center Miocene to the current day and this day many subaerial and submarine lively geothermal platforms are active.This ebook summarizes the geochemical and tectonic beneficial properties, and the evolution of assorted kinds of ore deposits and present island arc and backarc hydrothermal structures in Japan beginning with the Mesozoic
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Additional info for Geochemical and Tectonic Evolution of Arc-Backarc Hydrothermal Systems: Implication for the Origin of Kuroko and Epithermal Vein-Type Mineralizations and the Global Geochemical Cycle
This may Chapter 1 24 LII L ,, , ,L. Argentite l W I i iii iiiii ? 14. Schematic diagram showing mineralogical changes in various kinds of ores of Kuroko deposits (Matsukuma and Horikoshi, 1970). suggest that the C sub-type deposits formed at higher temperatures and close to the volcanic centre and B sub-type deposits are distal type and formed at lower temperatures. Tetrahedrite-tennantite composition varies widely in Kuroko deposits (Yamaoka, 1969; Yamaoka and Nedachi, 1978a; Yui, 1971; Horii, 1971; Shimazaki, 1974; Kouda, 1977; Shikazono and Kouda, 1979; Ono and Sato, 1995; Ishizuka and Imai, 1998).
31. 313C and 3180 data lie between igneous (3~3C = -7%o, 3180 = +8%0) and marine carbonate value (313C = 0%0 and 3180 = +20%o). This indicates that magnesite and dolomite formed due to the interaction of hydrothermal solution with the biogenic marine carbonates. Dolomite and magnesite data are plotted close to marine carbonate values, suggesting that they formed in the central zone close to the ore bodies due to the interaction of hydrothermal solution with the biogenic marine carbonates (Fig. 31).
30. , 1983). ore, 100-240°C for barite and 140-170°C for black and yellow ores. Lu (1969) reported homogenization temperatures of the fluid inclusions in quartz from the Uchinotai-Higashi deposit of the Kosaka mine to be 200-250°C. Watanabe (1970) studied fluid inclusions from Ainai deposits and found that the homogenization temperature for the siliceous ores (190-300°C) is higher than that for the black ores (120-290°C). Marutani and Takenouchi (1978)clarified the variations in homogenization temperature and salinity of inclusion fluids in quartz from stockwork siliceous orebodies at the Kosaka mine (Fig.