日本冈山县人形峠地区,经过过去十年的普查勘探,发现了八处铀矿床或“铀矿床群”。这些矿床或矿床群都赋存在直接不整合于花岗岩基底之上的新第三系三朝群中。它们属于沉积型铀矿床。铀矿化受基底槽状构造的控制。含矿主岩主要是距花岗岩基底很近的砾岩、砂岩及部分泥岩,它们大体呈水平状展布(图1)。 In Okazuka, Japan, over eight years of census exploration, eight uranium deposits or “uranium deposits” have been discovered. These deposits or deposits are hosted in the New Tertiary Series which are not directly integrated into the granite basement. They belong to sedimentary uranium deposits. Uranium mineralization is controlled by basal trough-like structures. The ore-bearing host rocks are mainly conglomerates, sandstones and some mudstones that are very close to the granite basement and are generally horizontally distributed (Fig. 1).