Multivariate Information Prospecting Prediction Of Duo-long Porphyry Copper Deposit Forecasting Area In Tibet

Based on the Mineral Resource Potential Evaluation of Tibet projects，this studywas completed．The aim is to provide some remote sensing information support fordelineating minimum forecast area in the evaluation of the potential of the copperresources in Tibet．The Bangong Lake-Nujiang metallogenic belt have huge potentialfor mineralization，which account for an important position in Copper ResourcePotential Pvaluation of Tibet．Because of the low degree of the geological explorationwork and less geological data，it is difficult to evaluate the potential of the BangongLake-Nujiang metallogenic belt and remote sensing technology，regional geochemicalexploration techniques can play an important role in the areas．Therefore，Selecting Duo-Long porphyry copper deposit forecasting area In Tibetas the regions of interesting，with “typical deposits—metallogenic essential factor—prediction factor—prospecting prediction”as the overall thinking，summarize themetallogenic essential factor by typical deposit research； By remote sensinggeological techniques，interpret remote sensing mineral geological features andextract the alteration information related to mineralization，summarize the remotesensing favorable mineralization information；With regional geochemical techniques，delineate single element anomalies and the combination element anomalies of streamsediment data，summarize the geochemical favorable mineralization information；Based the metallogenic essential factor of typical deposits and avorable mineralizationinformation of remote sensing and geochemistry，summarize the prediction factor ofstudy area；Finally，on the basis of the preferred predictor variables，wite thefavorableness to ore-forming method，perform the prospecting prediction based onGIS techniques in study area and some innovative results have been achieved，whichprovide some support for Mineral Resource Potential Evaluation of Tibet．The studyresult are expected to have great referential value for potential evaluation of mineralresources in similar areas in Tibet．The main results of the research are as follows： 1．Based on the full collection of the existing regional geological data and thetypical deposit information，by draw lessons from the results of previous studies，summarize the metallogenic essential factor．2．According to the principles and methods of remote sensing geologicalinterpretation and the remote sensing technology requirements of National MineralResource Potential Evaluation，interpret the line，rings，color，surface elements relatedto porphyry copper deposit combined with the actual situation of the study area andgeological map，produce te interpretation map．3．Based on typical object spectrum features，using the“mask+principalcomponent analysis”anomaly extraction method，“average+n times the standard”anomaly threshold determination method and arithmetic average density slicingnomaly drading method，extract the alteration anomaly of typical deposits and studyarea from ASTER and ETM+images．Then analyze alteration anomaly characteristics，compare ASTER anomaly with known ore body，compare ETM+anomaly andASTER anomaly，demonstrate the feasibility of prospecting prediction with theETM+anomaly in study area．4．By adopting multivariate statistical methods of iteration，cluster analysis，andprincipal factor analysis，stream sediment data were processed and analyzed，whichrevealed the spatial distribution of geochemical element contents and helped todelineate single element anomalies and the combination element anomalies，and thecorresponding anomaly contour map were produced．5．Based on comprehensive analysis of geological，remote sensing，geochemicalfavorable mineralization information，summarize the prediction factor and optimizethe predictor variables，with grid cells as geostatistics units，by employing GIStechniques and favorableness to ore-forming methods，perform the prospectingprediction in study area．Finally，delineate A，B，C，three levels of minimumprediction area with favorable mineralization and evaluate the effect by comparation itwith known deposits．The results show that the methodology and processes areeffective and feasible，which is applicable to the prospecting prediction rapidly ofthese areas with low degree of the geological exploration work and similar geologycondition．...