Liu Jiu Mountain Copper And Silver Deposit Geological Characteristics And Prospecting Marks Of Longjiang Country In Heilongjiang Province

In this paper, Liu Jiu Cu-Ag deposit in Longjiang county in Heilongjiang Province as the research object,based on "the Hou Liujiu mountain region Cu-Au mine detailed investigation in Longjiang county in Heilongjiang Province " project.Using field large scale geological mapping,geophysical prospecting and geochemical anomaly characteristics analysis,trenching, shallow bores wells, drilling and other field work method and rock and ore microscope identification in laboratory,system studied the strata, structure,the distribution,scale,occurrence of magmatic and other metallogenic geological conditions in this metallogenic zone.On this basis,focus on Liu Jiu Cu-Ag deposit ore-controlling structures, ore-bearing rock series characteristic,the relationship between orebody and intrusive rocks,composition of ore mineral and structure of ore, wall rock alteration characteristics for careful study.Find out the Liu Jiu Cu-Ag deposit metallogenic geological features and mineralization.Through the research,obtained the following main conclusions.1.Liu Jiu Cu-Ag deposit is located in NNE Early Cretaceous neutral-acidic volcano rock zone in the western margin of the Songliao Basin.The fracture structure provides the space and power for the magmatic activity.Studies have shown that in this area the late variscan and late yanshanian magmatic rocks are widely distributed,which in the late yanshanian granite porphyry copper mine in this area is the main ore-forming parent rock and the mineralization plays a controlling role.2.Liu Jiu Cu-Ag deposit is located in the intersection of the Hou Liujiu-Qian Liujiu mountain NW fault zone and Xi Liujiu mountain-Qian Liujiu muontain EW fault zone even then is located in the south of the Qian Liujiu volcanic institution.The ore deposit is controlled by the composite structural position of the basement EW fractured zone and the volcanic cryptoexplosive breccia belt and the orebody is found in the volcanic cryptoexplosive breccia.3.Wall rock alteration in the mining area is strong,and the alteration belt is mainly developed in the cryptoexplosive breccia and the scale is also the equivalent of the cryptoexplosive breccia.The main alteration is the silicification,sericitization and ore process is chalcopyrite,pyrite,limonite,etc.4.Liu Jiu Cu-Ag deposit geochemical anomaly is composed by Au, Ag, Cu, Pb, Zn, Mo six elements’ single element anomaly and the anomaly is in the NE irregular shape distribution and the anomaly set close tightly, high strength, large scale.When geochemical anomaly coincides with the induced polarization anomaly,it can be used as the direct prospecting markers.5.Orebody is mainly produced in cryptoexplosive breccia,and it occurs in irregular vein, lenticular.Ore minerals are mainly pyrite, chalcopyrite, sphalerite.Ore texture is mainly xenomorphic granular texture,solid solution separation texture,poikilitic texture and vein texture by filling,etc.Ore structure is mainly massive structure,disseminate structure and breccia structure.6.According to the metallogenic geological conditions,ore output characteristics,ore-controlling structure, wall rock alteration characteristics,preliminary think this ore deposit is a medium to low temperature hydrothermal filling type copper silver deposit and metallogenic epoch is in late yanshanian.