| Qinghai province, as a big province of mineral resources, has rich mineral deposits.Geochemical prospecting is still the main prospecting method in this province. In the past30years, over500geochemical comprehensive anomalies, and more than6000single elementanomalies were marked off through geochemical prospecting. Therefore, geochemicalprospecting made a significant contribution to geological prospecting in Qinghai province.This paper is based on the mineralization and halo of geology, geochemistry theory，using the regional geochemical anomaly achievements to develop the second collation andexploitation. The data of this paper are based upon the1:2000000(1:5000000) regionalgeochemical investigation data of Qinghai province. At the same time, the medium-large scalegeochemical investigation map (1:50000-1:10000) are also multipurpose used. The aims ofthis paper are as following:1) Summarizing and analyzing systematically the characteristicof the whole province regional geochemical with the modern information technology, andresearching the important geochemical anomaly of mineralization in regional;2) Summarizingand researching the anomaly characteristic of the typical deposit, furthermore, building thegeochemical exploration model of the metallogenic zone;3) Quantitatively forecasting thegeochemical of the copper resources in Qinghai province;4) supplying the quantitativeforecaster technique for the other mineral resources.Through the research we can use the4*4meshed data and big Windows moving toequally fit the ratio of the data set background which base on the data rectification, then, tomake a geochemical map which include the set background and anomaly of all the elementratio as the basis to detect the high and the low anomaly, make the map show theelements(anomaly) information and comprehensive anomaly at the same time; This methodcan avoid many trouble from the subregion-divide by man-made, keeping the standardizationstate of the natural transition. That means, the effect is nice, and to use this method isreasonable.The comprehensive anomaly can be distinguished by comprehensive anomaly mapwhich made on the basis of the34elements as the base. We divided this process into threesteps: determinate in space, pick out the feature combination, and classify the prospectingsignificance based on the comprehensive study. This anormaly-study and mapping isrelatively rigorous. It is useful for the qualitative and quantitative prediction of abnormalities.The reproducibility of results was relatively high, and the results are good.517comprehensive anomalies were recognized and16abnormal zone (belt) were rowed out inQinghai Province. This map clearly showed the regional geochemical change trend in Qinghai province.Combined with the geological backgrounds and matellogenic types in study area, theanomaly field of copper was typed into17main ore areas (belts), who have48prospectingareas and99target areas. We also considered other anomaly geochemical factors when weanalyzed the target areas.This paper made a contribution on setting different kinds of copper geochemicalprospecting models in different area of Qinghai province. According to these models, we putout138prospecting areas and they contain more than2,700tons of copper. This result putslight on searching porphyry copper deposits in Eastern Kunlun, also, marine volcanic copperdeposits in northern part of Sanjiang area and southern part of Qilian Mountain.The paper provides the methods and procedure systemically that can be used to predictgeochemical quantitatively. By analyzing the feature combination and similarity coefficient,we can separate the prospective areas; while by analyzing the areal productivity toquantification and analogy method, we can estimate the quantity of resource. In order to avoidthe artificial reasons may inflect the prediction, our method owns the full consideration ofgeochemical anomalies.By comparing the characteristics of quantitative prediction with qualitative prediction,we found that geochemical qualitative prediction is an effective supplement of qualitativeprediction, while the qualitative prediction is based on the qualitative prediction. Themethod that quantitative prediction uses to separate the prospective areas and target areas issearching the same kind of mining zones who has the same kind of characteristics group byusing computer in the whole area. The geochemical quantitative prediction seems morereliable on the separation of target areas than artificial separation.According to the study on the metallogenic regularity in our studied area, this paper hasput forward some new prospecting strategy and suggestions. Also, there had been a bigprogress on further ore prospecting. |
