Fromation mechanism and origin of gold-silver deposits in Japan

日本的金银脉型矿床可分为两类；低温型和中低温型。通过对矿石、脉石矿物、流体包裹体、围岩蚀变及稳定同位素的研究，估计了浅热液和中低温液类型的化学环境和成因。不同之处在于这些特征特征对这两种类型进行了澄清。将这两种类型的特征特征与其他类型（黑子型、斯卡恩型）进行了比较。这些矿床可分为富硫化物矿床和贫硫化物矿床两种类型。富硫化物矿床比贫硫化物矿床形成于较浅的环境下。

Gold-silver vein-type deposits in Japan can be divided into two types;epithermal-type and hypo/mesothermal type.Chemical environments and origins for epithermal and hypo/mesothermal types were estimated based on the studies of ore and gangue minerals, fluid inclusions,wall rock alteration and stable isotopes. Differences is these characteristic features for these two types were clarified. These characteristic features for these two types were compared with those for the other types (Kuroko-type, Skarn-type). This comparison suggests that these deposits can be divided into two types, sulfide-rich and sulfide-poor deposits. Sulfide-rich deposits were formed under the shallower environment than sulfide-poor deposits.