Analysis Geochernical Nomalies Of Primary Halo For Blind Ore Locating Prediction

Tonglushan Copper-iron (Cu-Fe) Deposit is one of typical contact metasomaticskarn type deposit from Cu-Fe polymetallic metallogenic belt deposits in the middleand lower Yangtze River. But after more than forty years of mining， resources havealready been moderate crisis. So looking for the continued resources is urgent. Thearea of mining areas is3.5Square kilometers and there exist13orebodies which aresmall or big，in which main orebody is deeply buried，Ⅲ-orebody is in negative820mbelow and ⅩⅢ-orebody is in negative below1200， still can’t pointed out. Throughthe research on the metallogenic regularity and geological， geophysical andgeochemical abnormal features， it is thought that the deep and periphery of the miningarea remains potential.The study of paper begins from abnormal analysis of geochemical data. In thebasis of aiNet network mode，the paper researches the methods of data preprocessing toensure the completeness and accuracy of the data in the case of the inadequacy and lossof information; as the guide With fractal theory，the paper researches mathematicalmethods of calculating the low limit of geochemical anomalies and delineatinggeochemical anomalies concentration zoning dynamically, which is suitable forgeochemical element distribution characteristics; as a foundation with independentcomponent analysis theory (ICA)， the paper researches a set of methods model ofextracting quantitatively the geochemical element assemblage anomalies in thegeochemical spatial data volume. These methods model will be used in the1∶200000stream sediment survey data and the1:50000strea m sediment survey data oftonglushan Copper-iron (Cu-Fe) deposit. From the result of anomaly analysis， it isproved that the effect is good and the models are reliable.In the construction space before forming minerals in hydrothermal， which transports (migration)、sports、precipitate、exhalation and enrichment，often exceptto see macroscopical signs of wall rock alteration and mineralization in the surroundingof deposits, in the distance for most of the area it left the microscopic trace of ore-fluidactivines-primary halo. With geochemical primary halo，it is an effective prospectingmethod of looking for blind ore. The paper research on primary haloes’s geochemicalof mining area, ⅩⅢ-orebody, as the research object. Through analyzing therelationship between ore-controlling structure amd the space feature of orebody， andthe relationship between alteration zoning and ore body distribution， the paper studieson metallogenic episodes and metallogenic stages of deposits; Combining geochemicalbackground of forming deposits and element combination characteristics ofore-forming and halo-forming, it is studied on the geochemical characteristics ofprimary halo of Cu-Fe orebody and ⅩⅢ-orebody， and determine the primary haloindicator elements combination.Using nonlinear model， the paper research on the geochemical profile datacharacteristics of primary halo, the integration of uncertainty prospecting information，extraction deeply of information connotation，and extract the information of singleelement anomalies and the combination abnormal of primary haloes’ geochemical.The prospecting potential area is initially defined according to geochemical anomalyThis paper systematically studies the deep geological process and spatial responseof mineralization， On the basis of clearing the primary halo indicator elementscombination from different depth area， the paper analyzes primary halo zoningsequence and special zonation of stacking structure and anomalies related tomineralization about ore-body halo of different metallogenetic period and stage in thespace， builds the three-dimensional rock mass model，the three dimensional ore bodymodel， the three dimensional primary halo anomaly model，Stacking analysis toidentify prospecting marks of different mineralization depth，difference the couplingrelationship between the deep metallogenic and the shallow prospecting, realizes theprediction of deep blind orebodies.In addition， to multi-dimensioned geochemistry data processing flow， the papercarried out the geochemical data processing and the design and realization of itsprototype system. The system can be divided into the three parts: data processsubsystem、map editing and the design and realization of expert database. In the wayof mixing with VC++and Matlab， we realize the geochemicaldata processing; Basedon second development of MapGIS， we complete the map editing; we build the expertdatabase by VC++. In short， the paper， with tonglushan Cu-Fe deposit for research area， throughthe secondary haloes’ geochemical data and primary haloes’ geochemical data and usingnonlinear theory，combining3-d modeling technology and the theory of structuralsuperimposed halo，researches and practices the prediction of the deep blind ore abouttonglushan Cu-Fe deposit and gets a good effect.Innovations of the paper rest with:In the basis of Nonlinear Method, which is objective reflection of Geochemicaldata of nonlinear characteristics and the combination between the elements, includingaiNet network mode, Fractal theory and independent component analysis theory (ICA).By application of secondary halo and primary halo geochemistry data, finally weestablish a set of applicable to the analysis of the geochemical data and new technologymethod system.Previous prospecting in primary haloes’ geochemistry always used qualitativeanalysis and2d representation. This time, the article gave a quantitative nonlinearmethod, and made a scheme about the prediction of deep blind orebodies of primaryhaloes’ geochemistry based on three-dimensional simulation.