Ore-forming Geological Characteristic And Prospect Ing Potential For Pb-Zn Polymetallic Deposit In Jingren Region Of Qimantage Area,Qinghai Province

The Jingren deposit is located in the Jingren Montain,344km from Geermu Qinghai Province.It is located in the Qimantage metallogenic belt of Qinghai,with a mining area of 76.15km~2.The deposit is adjacent to the Hutouya deposit,and we found a skarn-type polymetallic ore body in this area that similar to the Hutouya deposit.In this area,the exposed stratigraphy are Langyashan Formation,the Tanjianshan Formation,the Diaosu Formation,the Eilashan Formation and the Quaternary.In this area,with a strong tectonic activity,the mainly direction is northwest and near east-west.A large area of Late Triassic intrusive rocks is distributed in the mining area,and skarn-type polymetallic ore bodies are found around the surroundings.At present,we have divided 3 ore belts,10magnetic anomalies,and 50 iron-polymetallic ore bodies,as a result we have Calculated9.3 million tons of metal resources.This paper is based on systematically combing the geological characteristics of the Jingren deposit,researched the metallogenic regularity and ore-controlling factors,at the same time,we discussed the genesis of the deposit combinated with measured diagenesis and metallogenic age.It also analyzes the prospecting prospects of the mining area and the prospecting area of the mining area in the future.Through the research of Metallogenic regularity and genesis of deposits in this area,the metallogenic type of the Jingren deposit belongs to the skarn type.According to the difference of output position,It can be further divided into two subtypes,one is that the acidic rock mass invades along the weak surface of the structure,because of the rock mass and the carbonate directly contact,formed the skarn ore belt-the typical(internal contact zone)skarn.The second type is that the ore-bearing hydrothermal fluid migrates through a long distance and is filled in the structural fracture zone to form a skarn ore body away from the rock mass,named the outer contact zone skarn(remote hydrothermal percolation).In the case of this type,We can't found large-scale intrusive rocks,and far from the rock mass.There are three main ore belts in the Jingren deposit,and named the I,II and III.these ore belts are all produced in the skarn of the fault structure.The II belt belongs to the internal contact of skarn type;The?and III ore belt belongs to the external contact zone skarn(remote hydrothermal percolation).In this Area,the minerals are mainly Pb,Zn,Cu,Mo,Fe and Ag,and related to the changes in mineralization temperature closely.The ore body is directly contact with the rock mass,and the ore-forming temperature is relatively high.The ore mineral is mainly pyrrhotite,chalcopyrite and magnetite.Through this study,the Diaosuzu Formation is the main ore-bearing horizon of skarn-type(iron)polymetallic minerals in the Jingren mining area.The east-west and north-west directions are the main ore-controlling structures,and the Indosinian period is the most important metallogenic period.The Late Triassic granites are closely related to mineralization.The metallogenic and intrusive magmatic rocks,strata and tectonics in the Jingren mining area are related to the contact mode between the rock mass and the surrounding rock.According to the analysis,the west extension of the II ore belt in the Jingren mining area,the C8,C9 and C10 magnetic heterogeneous zones and the deep porphyry zone on the north side of the I ore belt are good prospecting areas and should be the key areas for future exploration of the deposit.