中新世海底火山岩和火山碎屑岩复盖着日本列岛的内部地区和本州的 Fossa Magna地区,通称为绿色凝灰岩建造(图1)。绿色凝灰岩地区的矿床有两种类型:其一是黑矿型矿床,它是与海底长英质火山活动紧密相关的层控块状多金属硫化物-硫酸盐矿床;另一类是后生的、次火山岩脉型矿床,后者也与海底火山岩紧密共生。这两类矿床的一般情况和特征在表1中作了对比。图1示出本文所研究的矿床位置。 The Miocene seabed volcanic rocks and pyroclastic rocks cover the interior of the Japanese archipelago and the Fossa Magna region of the state, commonly known as green tuff construction (Figure 1). There are two types of deposits in the green tuff area: one is the black-ore deposit, which is a stratiform, massive polymetallic sulphide-sulphate deposit closely related to the submarine long-felsic volcanic activity and the other is epigenetic, Sub-volcanic vein deposits, the latter also with the submarine volcanic rock symbiosis. The general situation and characteristics of these two types of deposits are contrasted in Table 1. Figure 1 shows the location of the deposits studied in this paper.