Research Of Multiple Geoscience Information Prospecting Prediction In Xikuangshan Antimony Ore Field

"The world antimony city"Hunan of Xikuangshan antimony deposits in Southern China antimony ore belt is the most important super large antimony ore field of antimony, antimony reserves of the world for more than 13.8% of the total. However, after a hundred years of mining ore field, the majority of mine resource is close to dried up. How the crisis mines and its peripheral effectively predict target area, looking for new, valuable deposit, has become an urgent problem to be solved.In the light of Xikuangshan antimony ore field regional geological features, ore controlling factors, the main characteristics of typical deposit, geochemical anomaly, geophysical anomalies and remote sensing synthetic characteristic of anomalies on the basis of the study, summed up the ore field, the selection of multiple geoscience information prospecting factors, based on the GIS platform of multiple geoscience information predicting model, with the help of weights of evidence method and resilient BP neural network nonlinear predictive means two for ore field and its peripheral of metallogenic prediction, to locate the metallogenic prediction target area were screened and evaluated, and the flying water rock predict target area undertook preliminary engineering verification, the ideal effect has been achieved, also confirms set of multiple geoscience information metallogenic prediction system reasonable.This article studies the main content and the results are the following three aspects:1.Comprehensive history on all data, to analysis or supplement measurement data, combined with field survey and drilling survey, the redefinition of metallogenic regularity and metallogenic mechanism of, access to a number of traditional knowledge.In the regional geological, geophysical, geochemical research foundation, from four typical ore deposits in the ore field are summarized metallogenic geological characteristics and metallogenic regularity and metallogenic geological conditions, thereby extracting the prospecting marks. By analyzing of Xikuangshan antimony ore field and mineralization related strata are mainly the upper Devonian She Tianqiao group limestone part (for sandstone); basic tectonic pattern for orefield anticline and fault interchange, deep fault projection position is crucial; ore wallrock alteration mainly silicification, mineralization is confined to She Tianqiao group limestone, sandstone and chess Catalpol Bridge Group limestone in the silicide layer; antimony element amphoteric characteristics determine metallogenic spatial location in oxidation zone; magnetic and gravity anomaly is mainly distributed in the European family of punch and Tan Jiachong, extending in the F75 big fault footwall; most ore and ore hole appeared in the geomagnetic high value anomaly zone; combined with the field of local gravity low Bouguer anomaly and other factors, to infer the deep intrusive; Sb, As, Hg etc. metallogenetic element geochemical anomalies in facial abnormalities and known deposits anastomosis, and large size, high strength, obvious concentration centers; natural placer mineral abnormalities underlying distribution in in four large deposit periphery, the basal clastic rocks are mainly in Xikuangshan antimony deposit ore-forming source; regional granites and deep concealed rock provides some mineral and some mineralizer, mineral Migration from thermal power in deep crust and upper mantle, regional granites and deep concealed rock mass. These improved understanding and perspective is a metallogenic model prediction based, also decided to predict the outcome of the key factor.2.change the traditional remote sensing image analysis of the extraction of only pay attention to the way for the" first, and then the sky again ground geological, " mode of operation, through remote sensing comprehensive indices of abnormal raised, exploration of crisis mines in large scale range of peripheral information extraction mechanism and application method.Crisis mines have a considerable degree of accumulation, remote sensing due to its macroscopic advantage needs to answer the" what", after a comprehensive analysis of metallogenic regularity of looking after mineralization environment, found in Xikuangshan deposit general occurrence space plane projection in silicification belt and has strong oxidation environment fracture zone interchange, the remote sensing to find this special occurrence section. By means of field spectral instrument testing, and the establishment of a typical remote sensing geological geochemical profile analysis. Remote sensing image based on ASTER, respectively, from visible to infrared band extraction iron staining of abnormalities and alkylene carbonate, abnormal, which eliminate the results reflect the geochemical index F1 (Sb, As, Hg)/F2 (Co, Ni, Cr) distribution, that is the macroscopic quantities from oxidizing environment; thermal infrared anomaly extraction silicification, and then oxidizing environment index and silicified alteration anomaly was obtained after the intersection of the study area remote sensing abnormal index. The exception is the basis of Xikuangshan known deposits distribution in space environment characteristics, using remote sensing macro is targeted to a new extraction of remote sensing anomaly form, it is not only clear goals, and fully tap the ASTER holographic information, at the same time remote sensing anomaly spatial distribution patterns were more continuous and complete. Therefore, in the large scale prediction process, exploration remote sensing anomaly information extraction of remote sensing target, reduce the uncertainty factors, for crisis mine and its peripheral remote sensing prediction has important significance of remote sensing anomaly, comprehensive index method the following:F (x)=a silicification and a iron staining of abnormal/a (hydrocarbyl carbonate mineral cluster+group)This is based on the landform, the recovery and extraction of remote sensing information to improve BPH vegetation inhibition method and DEM shading correction method, enhanced the shadows and vegetation of spectral information. 3.on the basis of the Xikuangshan antimony ore field of multiple geoscience information prospecting model, using weights of evidence and resilient BP neural network two kinds of mathematical geology prediction method, conducts the research area and its periphery ore cross prediction, forecasting results engineering verification shows that the effect is obvious.In the full analysis of the Xikuangshan known deposits metallogenic regularity, from numerous geological information identify 12 typical ore factor, in the MapInfo1l.0 platform using weights of evidence method to ore field and peripheral of metallogenic prediction; at the same time through improved resilient BP neural network algorithm and programming, using the improved resilient BP neural network method for the prediction of the study area was the same metallogenic prediction; then two methods to predict the results of analysis of the intersection, the delineation of 3 grade and 3 gradeâ…¡prospecting target area. The flying water rock deposit deep of edge of target zone (A1) metallogenic geological conditions, should have a good prospect, engineering verification confirms the validity of prediction; old mine deposit deep of edge of target zone (A2) in the deep part and periphery has further prospecting potential, to Tong Jiayuan in brilliant class the dikes and the old mine to the North West of the prediction of target area should pay attention to, especially the 52 line to 82 line F75 faulting footwall area, may become the fourth major mineralization center of antimony ore field.Practice has proved, the crisis mines due to the historical data of precipitation, experts hold different views, multivariate information rich, must with the aid of GIS synthetic information mineral resources comprehensive prediction method, and with both section cross prediction of similar" two eyes" method can capture the interested target. At the same time, in the full study in the metallogenic regularities and ore spatial characteristic in the foundation, use ASTER remote sensing extraction method to get holographic integrated remote sensing abnormal index, with goal orientation and targeted extraction of remote sensing information features, in large scale crisis mine periphery and deep side prospecting macroscopical forecast has an important role in.