K-Ar Ages of Epithermal Gold-Silver Mineralizations from Akan-Taiho-Tobetsu Mine Area in Kitami Metallogenic Province, Hokkaido, Japan

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Epithermal vein-type gold-silver mineralization from the Akan-Taiho-Tobetsu mine area in the Kitami metallogenic province is characterized by Pliocene (ca.3.8-2.2Ma) based on the K-Ar ages for the vein quartz and adularia mixtures and hydrothermally silicified and illitized or alunitized rock.<BR>The epithermal gold-silver mineralization of ca.3.8-3.2 Ma is representative of the Motoyama and No.1 veins of the Akan deposit and the Motoyama and Takinosawa veins of the Taiho deposit in the northern part of this area, and is accompanied by a near-neutral hydrothermal alteration. On the other hand, that of ca.2.4-2.2 Ma consists of the Kanehana, Kinshu, and Zuiho veins (ca.2.2 Ma) of the Taiho deposit in the northern part of this area, and the Tobetsu vein deposit (ca.2.4 Ma) in the southern part of this area, and is accompanied by the vein-related illitization and/or adularization. The Shikerepeyama acid alteration halo with alunite (ca.2.3 Ma) in the southern part of this area also formed at approximately the same time as the low-sulfidation epithermal gold-silver deposits (ca.2.4-2.2 Ma).
資源地質学会の論文