Lead-zinc Ore-centralization Area Quantitative Prediction And Evaluation In Luan Chuan

The Molybdenum-Lead-Zinc Polymetallic concentrated area in Luan Chuan is one of the important metallogenic belt in china.This paper based on the comprehensive analysis of geology,geophysics,geochemistry and remote sensing data,using the methods of GIS and matematical modeling,the reasearch on Pb-Zn mineralization concentrated area of quantitative prediction and evaluation is carried out,the theory with importance and realistic meaning.The main achievements are as follows:(1)Under the metallogenic series,based on the geological condition of mineralization and analysis of typical deposits(metallogenic model,Prospecting Model)in research area,the Prospecting Model include Lead-zinc deposit about rock control and layer control is established.Mo?W?Fe?Pb?Zn?Ag metallogenic series which is related to mesozoic porphyry and Pb?Zn?Ag metallogenic series which is related to neoproterozic.(2)Based on the 1:250000 scale gravity data,magnetic data,For gravity and magnetic data of different height to the continuation and a different direction to first derivation by using GIS platform,combined withl:10000 scale geologic map and geological section map,Comprehensive interpretation the gravity and magentic anomaly profile at various depths(the earth's surface,400m,800m,1200m,1600m?2000m),Judged the hidden yanshan period rock body and ore-control faults.(3)On the basis of stream sediment survey and lithogeochemical survey,The extraction of different depth(the near surface,400m,800m)lead and zinc silver anomaly information based on statistical analysis.The geochemical data of factor analysis in order to confirm the element combination type combine with the original geological material.In this paper the Stream sediment geochemical application in the near surface metallogenic prediction because It reflects the surface of each element:distribution state.However,the lithogeochemistry can accurately reflect the distribution of the main ore-forming elements.Especially the element combination abnormal can reflect the prospect of metallogenic district.The combinations of elements abnormal as a important basis in the deep forecast in this study.(4)Based on the geology,orefield,geophysics,geochemistry and remote sensing data,combine with prospecting conceptual model,make use of the GIS spatial analysis technology,three dimensional visualization technology and Mathematical modeling method for extract optimize and screen geological variabies(Stratigraphic combination entropy,rock mass,Fault density,Fracture intersection,fold)at different depths(the near surface,400 m,800 m).(5)Making sure the threshold by Evidence right mathematical model and fractal method,Extracting the cause of mine layer process comprehensive evaluation in the three dimensional space and ascertain favorable ore-prospecting target area.