Prospecting Model And Prediction Of Porphyry Metallogenic System In Northern Tuquan-Linxi Metallogenic Belt Of Daxinganling

Porphyry metallogenic system(porphyry,skarn and low temperature epithermal deposit),concerning magmatism and hydrothermal process,was associated with Most Cu-Mo and part of Pb-Zn-Au-W nonferrous metals mineral deposits.Tuquan-Linxi metallogenic belt is located at middle segment of Daxinganling metallogenetic belt.No breakthrough wasmade in finding large and middle ore deposits in the northern part of the belt in the past few decades.Despite this,An integrated analysis of the metallogenic geological background and the favorable ore formation conditions,this belt have good metallogenic prospects on porphyry metallogenic system deposits.Therefore,studying on the prospecting model and prediction of porphyry metallogenic system has an important meaning and value on making breakthrough in this area.The main achievements are listed as follows:There are 3 deposit types in Tuquan-Linxi metallogenic belt:porphyry-type deposit,skarn-type deposits and low temperature epithermal deposit.Through anatomizing typical and representative deposit,research works further clarify the geological features of ore deposit,orebody characteristics,ore character,wall rock alteration characteristics and discusses ore genesis.The paper holds that both three deposit types are related to Mesozoic volcano-magmatic activity.According to ore deposits(ore occurrences)and regional ore-controlling structures,Tuquan-Linxi metallogenic belt can be divided into 3 minerogenetic sub-zones.Mineralization time were concentrated in 171-110 Ma,However,it is gradually tend to be more early form east to west and from north to south.Ore-forming material originated from mantle magma.The various ore deposits can be devided into 4 metallogenic series according to metallogenic background,metallogenetic environment,spacial distribution regularities of the deposits,the nature of magmatic relating to metallogenesis,mineralization time,evolution characteristics,relationship of different types of minerals ore genesis:(1)Cu-Pb-Zn-Ag-Sn metallogenic series of ore deposits related to early Yanshanian periodsintermediate-acidic magmatism;(2)Fe-Cu-Pb-Zn-Ag-Mo-Sn metallogenic series of ore deposits related to late Yanshanian periods intermediate-acidic magmatism;(3)Cu-Pb-Zn-W-Mo-Au metallogenic series of ore deposits related to late Yanshanian periods acidic magmatism;(4)rare and rare earth mineral deposits related to late Yanshanian periods alkali granite.Research shows that different genetic types and independent ore deposits(ore occurrences)form a complete metallogenic system,which metallogenic characteristics is similar to the other porphyry metallogenic system(porphyry-type,skarn-type,low temperature epithermal deposit).Regional prospecting model of different genetic types deposit and summarize the ore-controlling factors and prospecting criteriahas been established.theoptimal selection of geo-exploration technologies,it clearly put forwardthat the combination of geological mapping,geophysical exploration,geochemical exploration,remote sensing exploration is an effectual way.Multiple geoscience informationhas been extracted,according to the achievements of geology,geophysical,geochemical prospecting,remote sensing methods and ore deposits(ore occurrences)characteristics combined withprevious research data.There are 5 metallogenic prospect areas and 4 prospecting targets have been delineated,which provide basic information and point out the direction for the exploration in research area.