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采自奥会津地热区钻孔中硫化矿物结垢及围岩中发育类似的硫化矿物组成的细脉(采自岩心),在该区均由承压地热流体沉淀而形成. 该地热区可划分出两种围岩蚀变。一种是由中-碱性热水形成的碱性蚀变,另一种归结于酸性热水作用生成的酸性蚀变。在日本,浅成热液金矿被分成两类:(1)金(银)-石英(冰长石)型:矿脉的围岩发生中-碱性蚀变,有冰长石化、绢云母化、绿泥石化等。(2)大规模含金硅化岩型:围岩发生酸性蚀变,有高岭石化和明矾石化。两类金矿床的矿化作用与上述两类热流体作用可归结于同一作用过程。
Taken from the scaling of sulphide minerals in boreholes in the Ordovitz geothermal area and the development of similar veins of sulphide minerals (from cores) in the surrounding rocks, all of them are formed by the sedimentation of unconsolidated geothermal fluids. Two kinds of wall rock alteration. One is alkaline alteration by medium-alkaline hot water and the other is due to acidic alteration by acidic hot water. In Japan, the epithermal gold deposits are divided into two categories: (1) gold (silver) -quartz (feldspar) type: mid-alkaline alteration of the surrounding rocks of the veins, with longicochemical ice and sericitization , Chlorite and so on. (2) large-scale gold silicide rock type: acidic alteration of the surrounding rock, kaolinite and alum petrochemical. The mineralization of the two types of gold deposits can be attributed to the same process as the above two types of thermal fluids.