Age and Style of Epithermal Gold Mineralization in the Minamikayabe Area, Southwestern Hokkaido
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Epithermal gold mineralization in the Minamikayabe area located on the Kameda peninsula, southwestern Hokkaido, includes the Mitsumoriyama high-sulfidation and Hokko-Minami low-sulfidation systems. The Mitsumoriyama high-sulfidation system consists of advanced argillic alteration which is sub-divided into alunite and kaolinite zones. This advanced argillic alteration grades into propylitic alteration laterally, and with a sericite alteration overprint in, and near to the advanced argillic alteration. The Hokko-Minami low-sulfidation system consists of adularia-bearing quartz veins with adularia alteration envelops. K-Ar ages of alunite, sericite and adularia indicate that the Mitsumoriyama high-sulfidation system was formed at approximately 6.5 Ma, and that the sericite alteration followed on from the advanced argillic alteration at 6.0 Ma, possibly due to an evolving hydrothermal system caused by an intrusion of quartz porphyry beneath the advanced argillic alteration zone. The Hokko-Minami low-sulfidation quartz veins formed at 3.9 Ma, which suggests no direct, genetic relation with the Mitsumoriyama high-sulfidation system. The high-and low-sulfidation epithermal systems in the Minamikayabe area occurred during periods of normal and oblique subduction of the Pacific plate beneath the Northeast Japan arc, respectively. Thus, the change in style of the epithermal gold mineralization in the Minamikayabe area from high-sulfidation to low-sulfidation may have been related to a change in the subduction mode of the Pacific plate.
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