In this paper,characteristics and mechanisms of large-scale low-temperature silver mineralization developed in northeast(NE)China have been introduced based on investigations of geological characteristics of silver mineralization,metal and fluid sources,migration and enrichment mechanism of silver,and genetic relationship between low-temperature silver mineralization and porphyry system.This study reveals that the host rocks of silver-lead-zinc mineralization in NE China are mainly siltstone and slate,and the ore-forming fluid is characterized by low temperature and low salinity.Multi isotope(C-H-O-S-Pb-He-Ar)system indicates that the ore-forming fluids and metals are mainly magmatic-hydrothermal origin.High-precision geochronological studies indicate that regional Ag-Pb-Zn mineralization is closely related to the early Cretaceous felsic magmas,and some deposits may be dominated by multiple superimposed hydrothermal events.Overall,the genetic type of the widespread Ag-Pb-Zn deposits in NE China should be classified as epithermal deposits,and those magmatic-hydrothermal ore systems are genetically associated with regional porphyry ore systems.Reduction and cooling of the hydrothermal system caused by fluid-rock interactions are the key mechanisms for silver precipitation.
关键词
银铅锌矿床/金属来源/迁移富集机制/低温银成矿系统/东北部地区
Key words
Ag-Pb-Zn deposit/metal source/migration and enrichment mechanisms/low-temperature silver metallogenic system/NE China
维普
万方数据