Research On Geological Setting Information From Remotely Sensed Images And Application For Metallogenic Predication In Liuhe District, Jilin Province

The research district lies in the northern margin of the north China plate .The north-western Jiapigou structure goes across the whole district.It has superior ore-forming geological condition, and the great ore prospecting potential. However, the ore prospecting is very difficult because of the harsh natural environment and inconvenient transportation of the district which cover heavy with the forest. Giving full play of remote sensing technology superiority and the leading function in this area is a rapid method that is very effective and applicability to conduct the synthesis mineralization forecast research and direct next round geology prospecting work.This article applied the remote sensing information separating extraction technology to extract alteration information related to the mineralization and the mineral which used the TM,ETM,SPOT5 multi-spectra remote sensing data, through the remote sensing image characteristic and statistical analysis of the band data characteristic value, combining with measurement and study of field rock mineral spectrum. Base on the region mineralization geology background and the mineralization condition generalized analysis,it conducts the ore prospecting research. The major findings are as follows:1. In order to enhance the usability of the research results, this article first carried on the comprehensive system remote sensing investigate interpretation and mineralization information extraction of Liuhe district with 1:50000 used TM,ETM,SPOT5 multi-spectra remote sensing data, then provided the new basic information and scientific basis for deploying the new turn of geological prospecting work in this area.2. Based on the studies of the geological data and the conventional image characteristic of rock stratum, through typical land sector field route investigation and geological field survey, as well as the specimen thin section analysis, the remote sensing image interpretation keys was formed, And the lithology of partial stratigraphy were also redefined.This article systematically completed the remote sensing geology interpretation of research area.3. The remote sensing altered anomaly was distilled including the geological minerals material which has known in this area, sector rock mineral actual spectrum contrast analysis. And this article separately extracted iron oxide anomalies and argillation anomalies related to metal mineralized by using the characteristic principal components analytic method and the ratio method. Through the average value filter and most superior density separation and other methods, the remote sensing anomaly was classified.4. On the basis of the above studies, the remote sensing anomaly regional distribution rule and inner linking with the minerals were deep understood by the verification of the key location and the analysis of the known mineral deposit, 10 ore prospecting area was selected which include 4â… -grade,4â…¡-grade,2â…¢-grade prospecting districts.