Mineralization Process And The Evaluation Of Prospective Areas On Lead And Zinc Ore In The South Of Zhangjiakou Area Of Hebei Province

The study area is located in the secondary structure unit-Yanshan rift belt on themargin of the North China,and Proterozoic and Mesozoic sedimentary strata of carbonateand Yanshan magma developed strongly, is of strong tectonic movement and favorableore-forming conditions。On the basis of basic geological research,this paper, leaded by the evolution ofsequence times on the timeline about the structural movement in the study area,determinethe deposit mineralization types,based on previous data and the known deposits (points)。After comprehensivly detemining the lead,zinc and silver polmetallic mineralizationprocess, this paper predicted and evaluated metallogenic prospective areas by the weight ofevidence and the Fuzzy logic method in Arc-SDM module with more application and betterapplication effect in recent years。On the basis of determined ore-controling factors, this paper selected five evidencelayers as layers for determining potential areas by the fuzzy logic method, which arerespectively strata,magmatic rocks,frature,geophysical and geochemical。The determinationof formation is on the basis of the previous research results and located and extracted oreformation。The fault layer and magma layer are determined by the relation degree value C。The determining process of geochemical evidence layer is:firstly, making the study area–Longguan area as the demonstration area, I took three geochemical date processingmethods(the traditional averaging method, trend surface analysis,and fractal method) tohandle geochemical date, and determined trend surface analysis method as the bettergeochemical date processing method,then delineated the abnormal distribution;geophysical evidence layer was determined by favorable surface gravity and aeromagneticinterval value chosen by the function of point opposite the suerpostitonï¼›finally, themineralization factor weights of five evidence layeres mentioned above were assigned bymanual assignment method。After analysising comprehensivly prediction results for different γ values(γ=0.7,0.75,0.8,0.85å'Œ0.9), we took the delineated potential areas and known deposits(points) into account, and deemed that: whenγvalue is0.9, the prediction effect is the best,and finally calculated the mineralization probability distribution map。On the basis of mineralization process analysising and ore-controling factors extracting,this paper overlayed spatially layeres such as strata,strcture,magmatic rocks etc,and reasonably explained geological origin of delineated ore-forming potential areas,andgave out the mineralization potential evaluation to direct the next geological survey in thestudy region。...