The Quantitative Analysis Method Based On GIS Of The Application Of Polymetallic Deposit Prediction In Chengde

Lead-zinc mine has been in urgent need of mineral resources in our country, especially in thecurrent context of rapid economic development, the demand for lead and zinc mineral resources,becomes very urgent.Hebei chengde area is important gold, lead and zinc silver polymetallic mineral FuJiOu.Research area although there are many polymetallic deposit exploration report as well as thecorresponding scale of work and the basis of scientific research, but a lack of unity in theory underthe guidance of comprehensive study. In addition, previous work while on the strata, structure,magmatic rocks in the lithofacies and palaeogeography environment, chronology, metamorphism,alteration of scientific research, but in the face of multiphase mineralization superimposed and dueto the late orogenic movement in the process of fracture, were summarized systematically and set,which affect the prospecting and metallogenic prediction.Existing research shows that the lead and zinc silver polymetallic deposit origin types, mainlyoccurs in fine grained granite in the cryptoexplosion breccia type (bull ring-barracks deposit),tectonic hydrothermal alteration rock type (pipe), magmatic hydrothermal type (north bifurcationtrench gate deposit) and the volcanic hydrothermal type deposit button (small flowers camp), etc.This section will be used to study as the foundation, focus on the chengde area of several maintypes of polymetallic deposit ore-controlling factors are studied, based on the extraction areapolymetallic deposit ore-controlling factors, provide the basis for the subsequent forecast.In this paper, based on this, through the analysis of the ore-controlling factors of typical oredeposits and extraction, application of fuzzy evidence provided GoeDAS, choose the layer layer asevidence that the acidic granite rock body in yanshan period buffer, training points in the first kindof gold the best buffer radius of3000m, C=2.54contrast, students value t=8.2. Fracture of thebuffer, the best buffer radius is1500m; Geochemical local anomalies, the second principalcomponent score (JB_PC1); Geochemical composite anomaly points figure first principalcomponents-A_PC1(S) as the evidence layers, generate the probability distribution of lead andzinc silver mineral resources from the forecasting area and the number of known mines largely fallsto predict abnormal area, visible using GeoDAS fuzzy evidence lead zinc silver mine in chengdearea of location prediction was successful, prediction results can guide the next step prospectingwork.Results of this thesis and innovation points as follows: for the first time in chengde region forthe first time use local singularity theory of element geochemical anomalies delineated, the methodcan be effectively enhanced the geochemical element weak anomaly information and enlarge. Firstfuzzy evidence weight method in chengde area lead and zinc silver polymetallic depositmetallogenic prospect areas is forecasted and analyzed.