Study On Metallogenic Characteristics And Metallogenic Prediction Of Silver-copper Polymetallic In Dayihe District,Horqin Right Front Banner,Inner Mongolia

Dayihe area of Qianqi,right wing of Horqin,Inner Mongolia,is located in the area of strong superposition of Paleozoic paleo Asia and Mesozoic circum Pacific two global tectonic metallogenic domains,belonging to paleo Asia metallogenic domain and Binxi Pacific metallogenic domain.On the basis of collecting and sorting out the previous geological and mineral data,this paper sums up the characteristics of the ore deposits in the area and studies comprehensively the ore controlling factors in the area by means of geophysical and other exploration engineering methods;probes into the genesis of the ore deposits,the metallogenic law and the prospecting criteria,and forecasts the metallogenic prospect area and the prospecting target area.On this basis,the following knowledge is obtained:The genetic type of ore(chemical)point in the study area is mainly hydrothermal type,a few of which are porphyry type.Most of the hydrothermal and porphyry deposits in the area are related to the magmatic tectonic magmatism of late Jurassic to early Cretaceous.The intermediate acid intermediate volcanic rocks of manketou OBO formation and manitu formation erupted in Late Jurassic contain a lot of ore-forming materials.The later intrusive Early Cretaceous granodiorite granodiorite porphyry is closely related to mineralization.The magmatic hydrothermal fluid migrates and enriches along the structural fissures and precipitates in favorable structural space to form minerals.The north-south,north-west(northwest)and north-east faults in the study area are the main ore guiding and ore bearing structures.Silver copper ore bodies are mainly located in silicified sericitized alteration zone,while silver molybdenum ore bodies are mainly located in altered granitic porphyry,which has the zonation characteristics of faceted pyrite sericitized granodiorite porphyry zone molybdate bearing pyrite sericitized zone cyanidized zone.The main metal minerals are pyrite and silver tetrahedrite,followed by sphalerite,bismuth,chalcopyrite and galena.In this area,the same direction twisted belt and the high apparent charge rate and low resistivity area distributed in the NE direction of the Bouguer gravity anomaly isoline are the favorable positions for ore prospecting.The collation and study of 1:50000 geochemical data show that Ag and Cu are closely related to as and Bi.Based on the above work,one silver grade II metallogenic prospect and two key prospecting targets are finally delineated.