Compositional Characteristics of Ores and Rare Minerals in the Kieslager-type Deposits of Japan

基斯拉格型矿床与海底基性火山作用有关。矿石矿物学非常简单，主要由黄铁矿、黄铜矿和闪锌矿组成。富铜矿中很少出现方铅矿、四菱铁矿和天然金，而由黄铁矿转化而成的富磁黄铁矿中出现几种钴矿物。柳原矿日野谷L-1矿体富锌矿石中，锗含量达4.3%的铜铜矿与斑铜矿、黄铜矿、黄铁矿和重晶石赋存在一起。在与酸性火山作用有关的矿床中，已知含锗矿物的赋存，但在Kieslagertype矿床中尚未发现。认为近大陆海底环境的流纹岩火山作用是柳原成矿的主要原因。包括目前资料在内，kieslager型矿床硫化物矿物的^<34>S值（CDT）在+1 ~ + 7%的狭窄范围内，与现代岭型硫化物矿床相似。与四国的三巴川带相比，石满托带和三巴川带的天龙河地区的矿床值似乎更大。原因仍未解决。需要进一步的同位素研究。

The Kieslager-type deposits are genetically related with submarine basic volcanism. The ores are mineralogically very simple consisting mainly of pyrite, chalcopyrite and sphalerite. Galena, tetratedrite and native gold occur rarely in copper-rich ores, and several kinds of cobalt minerals in pyrrhotite-rich ores converted from pyritic ores.Colusite with up to 4.3 % germanium occurs with bornite, chalcopyrite, pyrite and barite in Zn-rich ores of the Hinotani L-1 orebody, Yanahara mine. The occurrence of Ge-bearing minerals has been known in the Kuroko deposits related genetically with acidic volcanism, but not known in the Kieslagertype deposits. The rhyolitic volcanism in near-continent submarine environments is suggested to be responsible for the ore genesis at Yanahara.The ^<34>S values(CDT)of sulfide minerals including the present data are in a narrow range from +1 to +7 % in the Kieslager-type deposits, similarly to the modern Ridge sulfide deposits. The values seem to be larger in the deposits of the Shimanto belt and of the Tenryu river area in the Sanbagawa belt, compared with the deposits in the Sanbagawa belt in Shikoku. The reason is remained unsolved. Further isotopic study is needed.