日本北海道北上成矿省北上矿区中部一些浅成热液型金银脉型矿床的成矿时代

Mining geology Pub Date : 1990-03-31 DOI:10.11456/SHIGENCHISHITSU1951.40.17

H. Maeda

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引用次数: 16

摘要

利用岩脉与石英混合物的K-Ar测年方法，研究了日本北海道北上成矿省部分浅成热液型金银脉型矿床的成矿年龄。Kohnomai矿化发生在中中新世(12.9•}0.4 Ma)。另一方面，Ikutahara-Rubeshibe地区的金银成矿发生在晚中新世至上新世早期(Ryuo矿:7.7•}0.2 Ma;上津泽矿:7.4•}0.2 Ma;木卡矿:6.6•0.2 Ma;Saroma矿:5.3•0.5 Ma)。

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Mineralization Ages of Some Epithermal Gold-Silver Vein-type Deposits in the Central Kitami Mining District of the Kitami Metallogenic Province, Hokkaido, Japan

The mineralization ages of some epithermal gold-silver vein-type deposits in the Kitami metallogenic province, Hokkaido, Japan have been studied based on the K-Ar dating on the vein adularia and quartz mixtures. The Kohnomai mineralization took place in Middle Miocene time (12.9•}0.4 Ma). On the other hand, the gold-silver mineralization in the Ikutahara-Rubeshibe area occurred in Late Miocene to Early Pliocene time (Ryuo mine: 7.7•}0.2 Ma; Shakinzawa mine: 7.4•}0.2 Ma; Muka mine: 6.6•}0.2 Ma; Saroma mine: 5.3•}0.5 Ma).

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Mining geology

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