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日本的布计、大口、菱刈、黑仁田和花龙各矿床的冰长石的K—Ar年代,通过测定分别为: 布计矿床1.10±0.19Ma 大口矿床1.1±0.5Ma 菱刈矿床0.36±0.12Ma 黑仁田矿床1.3±0.7Ma 花矿床1.1±0.5Ma 这一地区,是日本的金银矿床的萨摩地区的东部地带。其形成于更新世时代,而在西部地区的金银矿床是晚中新世到上新世时代。另方面活动的地热体系沿火山从东部地区沿岸发生。因此,可以这样认为,火山活动的中心和矿化活动的中心,都是从西向东发展,在晚中新世时代开始产生。
The K-Ar dating of the ice feldspar in Japan’s cloth design, big mouth, Linggari, Heiren and Hua Long deposits were as follows: 1.10 ± 0.19Ma in the cloth plan deposit 1.1 ± 0.5Ma in Lingmu mines 0.36 ± 0.12Ma Heimian deposit 1.3 ± 0.7Ma Mineral deposit 1.1 ± 0.5Ma This area is the eastern part of the Satsuma area of Japan’s gold and silver deposits. It was formed in the Pleistocene era, while the gold and silver deposits in the western region were from the Late Miocene to the Pliocene. On the other hand, the active geothermal system takes place along the volcano from the east coast. Therefore, we can think that the center of volcanic activities and mineralization activities all developed from west to east and started to emerge in the late Miocene.