The Metallogenic Prognosis And Mineral Resource Targeting In The Xiahe Area, Gansu Province

The metallogenic prediction methodwas varied, It is very important for part of the whole deposit exploration, It was the defining of the prospecting work effect,at present,the metallogenic prediction method with geochemical exploration, computer, math, and other multi-disciplinary overlapping influence and promoting common development, and favoursprediction method towards the development of more scientific and more accurate.The metallogenic prediction methods has trend surface method, based on statistics of the geochemical data processing, The statistical deposits prediction can be divided into amount of information, the weights of evidence method, rank correlation method, multiple regression and stepwise regression analysis, discriminant analysis, the logical information method, character analysis, quantification theory predictionand so on, this article mainly using amount of information combined with the data processing the geochemical anomaly map target to identify areas and metallogenic prediction, the method of using different types of main is to improve the prediction precision, on the basis of comparative advantages and disadvantages of combining existing mining area new target prediction.Xia He of Gansu Province.it is located in the west qinling metallogenic belt.The regionmajor mineral include to san suoma,zao zigou hua erzhailiang and so on, we using 200000 scalegeochemical data, in the process of geochemical characteristics, we using cluster analysis, factor analysis, correlation analysis and other methods, obtaingeochemical anomalies sequence of study area, author used time after time iteration and remove,youdeng index ensure anomaly lower limit, geochemical data processing of the anomaly lower limit is improtant, so we have focus on the research, in the analysis found that the mean and the lower limit of 2 times the standard deviation can be a very good reaction known mineralization points and outliers high area, that showed high concentration anomaly appear side enrichment, concentration is relatively low anomaly shows the characteristics of strip, zonal distributionmain reason influenced by structure, the paper usedamount of information method to solve that disadvantage, used the amount of informationmethod to all kinds of geological structure is divided into certain(4 km x 4 km) grid.Such as fault,fold,strata and so on, put them information one by onestatistical, combination methods of qualitative and quantitative, analysis the proportion of each symbol, calculate a unit of information, amount of informationcalculation of the most important is the division of grid, that directly affects the reliability of the results, calculate everyinformation of unit, on the basis of drawing the contour map, what for delineating metallogenic target, according to the geological characteristics of the mineralization and metallogenic re Cularity, establish surrounding of Xia He gold and gold copper model, explore the metallogenic model, this article also using trend surface method of metallogenic prediction, the distribution of elements in the nature has its own laws, but also subject to the limit of the space relation, so the actual element are combination of local factors and random factors andregional factor, its principle is to fit the distribution of the surface element synthesis function, at the presence of the representative to observe this element on the surface of the distribution, the article also uses statistics in the Delphi method to forecast mineralization, the some experienced experts in combination with geochemical and geophysical data of ore deposits in the study area is analyzed, on the basis of the opinions of the experts to predict the likelihood of mineralization in the study area, or metallogenic zone range, in addition to this, in combination of remote sensing mineralized alteration information of metallogenic prediction, analysis of all factors may cause the ore.According to the all kinds of methods, used their respective features, bywork fieldsampling and mineralized point inspection, found that establishment of the prediction model can Cuide the prospecting, throughcomprehensive used geological, geochemical and remote sensing information,could be efficient accomplish prospecting prediction, the study found that Xia He has good prospecting prospect, that has potential big gold metallogenic potential.