The Application Of RS,GIS,and GPS In The Prediction For Gold Deposits, Mian-ning And Yan-yuan Area, Southwest, Sichuan

At present, there is a great disparity between the economic high speed developmental demands of our country and mineral resource. With the high-speed development of economy, the demands for mineral materials will increase rapidly. In addition, the demands of mineral resource will also increase quickly due to local economic development and other reasons. So, it is important for us to find out more mineral resources in a short time.The efficiency and reliability of minerogenetic prediction can be improved by combining RS with GIS .We processed RS images ,extracted the geological information related to mineralizing , such as geology, structures , stratam , rocks, etc, synthetically analysed remote sensing , the geological data and geo-chemistry, under the guidance of the theory and mathematic model , set up GIS mineralize model .On this condition, to develop this method and its theory, and to establish a system of perfect prediction, it is not only useful in studied degree area but also favorable for looking for new type and some form large-scale deposits in old studied area , and it has a great theoretical meaning. Meanwhile ,it has an important scientific meaning and practical value for studying and developing the quantitative prediction theory of mineral deposits . Supported by remote sensing and CIS, through image processing, information extracting and based on mathematic models of plural information , in this paper, some favorable gold areas in Mian-ning and Yan-yuan area have been predicted , and it achieved the following results:(l)Through remote sensing image digital processing , we made high accuracy remote sensing images and image interpretion maps .constructed a geodatabase of Mianning - Yanyuan- Xichang area, including basic data(district .drainage ,etc.) and thematic data (rupture, stratum , magmatic rock, etc.). This will provide scientific evidences for work of this area in the future.(2)According to the advantages and disadvantages of plural information , the author analysed suited conditions and ranges of different predictable models .confirmed the mathematic model to be adopted in the studied areas. Practice indicating: algebraic method can be used in those area where study degree is very lower.(3)Author studied the mineralize prediction model of plural information based on CIS, discussed the applications of different mathematic models, and also solved inaccurate which analysed only by normal maps in the past.(4)Through level division of the predict result which favorable for mineralize district in the studied areas .We put up a graduate method which is used to divide graduations of statistical result .This kind of dividing method is different from traditional interval or non-interval graduate method, it can avoid a subjectivity for level division and is favorable to divide the high value of the result.(5)In the light of rank points and weight of the predicting factors, minerogenetic prediction map had been made .On the basis of the map , six favorable districts to mineralizehad been determined.