Metallogenic Prediction Of Zhaxikang Type Antimony Based On GIS In Jiangzi-Longzi Region, Southern Tibet

This article studies antimony metallogenic belt in Jiangzi-Longzi region,Southern Tibet, relied on the mineral resource potential assessment project of theTibet autonomous region. The author collected geological, geophysical, geochemicaland remote sensing data of the target area. Through the study of a typical deposit, Theauthor has described the metallogenic background and metallogenic essential factor ofantimony metallogenic belt, in Southern Tibet, Jiangzi-Longzi region, concluded theregional metallogenic model for the region, established the prospecting model. Basedon the way of eigen-analysis and evidence weighting method, the author hascompleted a metallogenic prediction and prospect analysis in this region.Tibetan plateau is an important part of the global Cenozoic giant teths-himalayanorogenic belt. Evolution of its long geological history, especially in the Cenozoicorogenic processes, tectonic deformation-metamorphism, magmatism,metamorphism and hot fluid activity are very strong. These created extremelyfavorable conditions for the formation of a variety of metallic mineral resources andgeothermal. In this paper, t regional metallogenic model and metallogenic predictionof antimony ore belt in southern Tibe are researched, located in North Himalayanmetallogenic on the Himalayas metallogenic belt.This article reviews the geological background of the region (location of tectonic,stratigraphic, tectonic, magmatic activity, metamorphism), as well as geophysics,geochemistry, remote sensing and other regional characteristics. First of all, the authorhas studied the typical deposits, analyzed the deposit characteristics to establish theelements of ore-forming, and established of the metallogenic model of the typicalmineral deposits. Secondly, through the analysis of regional metallogenic geologicalconditions, the prospecting markers of antimony metal ore are proposed, included:ore-controlling structures are nearly EW to ore-controlling fracture and nearly NS toore-containing fault; ore-bearing rock strata mainly is the Ritang Formation and LureFormation of lower Jurassic.Starting from the spatial and temporal distribution of antimony mines, the authorexplored the regional mineralization process and metallogenic model in theJiangzi-Longzi region. Antimony deposit formation in the region mainly experiencedthe initial source of ore formation of Late Triassic to Early Cretaceous, the mineral preliminary enrichment of Late Cretaceous to Mid–Paleogene, enrichment andmineralization of the Late Neogene, to accept the regional metallogenic model for theregion.Finally, according to the regional metallogenic element characteristics, usingMRAS eigen-analysis and evidence weighting method, we selected predictorvariables, seted up the metallogenic prediction model, and delineated the smallestforecast area. According to the ore-forming probability, divided three smallestprediction area into A, B, C, the results fitted better with the known mine sites, andpredicted results is reasonable and credibility.Predictions of the weights of evidence method contained the known mine siteshighly. The predictor variables divided into detailed, conducived to the screening ofthe variables. But the income forecast areas do not conducive to the next stepexploration in survey deployment and not conducive to the next exploration in surveydeployment. Eigen-analysis combined artificial optimization and model calculations,seted a reasonable threshold changes. The income forecast area is relativelyconcentrated. But because of the predictor variable is a binary choice, the known orespots coverage is relatively low.