Study On Remote Sensing-Geochemical Exploration Information Fusion Method

With the national economy developed continuously and quickly, many multi-metal mineral resources face to the serious missing situation, which is not only restricted the development of economy, but also endangered the safety of national resources. Our country has already paid much attention about it. Now mining exploring is more and more difficult. Mine investigate in lie concealed, deeper and jumping-off district will be an important orientation of mining exploring. Therefore, it is necessary to look for a new method for information extracting to improve the efficiency of mining exploring. It has become one of important ways to research the mining exploring by remote sensing, geology, physical geography, geschemistry and so on.From the perspective of Earth system science, Geoscience space data performance as multi-relativity and enrich multi-dimensional, such as spectrum dimension variable of remote sensing multi-spectral/hyperspectral data; multi-elements variables of geochemistry information etc., they are the foundation of fusion for multi-Goespace information. As complex mineraliztion conditions, land cover status of remote sensing data and the resolution of differences between the restrictions, based on surface features of the electromagnetic radiation of the discrepancies in access to remote sensing information has advantages, has its limitations because of the strength of geochemical anomalies and the scale of the multi-constraints of geological factors, as a direct element of abnormal signs of regional geochemical exploration technology there are some uncertainties. The same goal of the remote sensing information and geochemical information between a lot of relevance, prospecting model of combining them is highly complementary to each other. The method of fusion for multi-Goespace information is the hot research field of Earth system science currently. It can eliminate the uncertain factors in information effectively, improve the description of the goal or environment, analyze and express the accuracy of the result, and obtain more abundant than single information.The altered rock(belt) often develop near by the orebody, wall rock alteration is an important symbol in searching hydrothermal deposit. The most of the altered rock containing more Fe3+(or Fe2+), OH- and CO32-, the rock spectrum test data prove that these ions has the features reflection and absorption bands in the visible light-infrared spectrum. Spectral characteristics of a significant difference, is the alteration of information from remote sensing of the physical basis. The study area using a variety of methods of information that extracted from remote sensing altered and demonstrate the alteration of information. Finally, characteristic band is selected and principal component analytical method is used in extracting clay-altered information;Partition standardization method is used in extracting ferric-altered information.The extracted remote sensing altered information is coincide well with the given points of mineral. It will provides guidances and references in further mineral resources investigation of this area. In the geological environment, geochemistry elements demonstrate its spatial distribution and mineralization of paragenetic association pattern by the way of combination. Based on multiple statistical theory, R-pedigree cluster analysis and factor analysis were used in elemental composition classification of the geochemical data in study area, elements combination get from the pedigree chart is consistent with the Factor analysis of orthogonal rotation factor matrix, the classification results were proved scientific and accuracy. It is statistical analysis to the geochemical study area on the spatial distribution of elements, mean and tripling variance is used in extracting geochemical anomaly in study area geochemical background value. According to lithology classified the study area, different geological unit generally has a different geochemical background, to address the low background areas and weak areas of high background abnormal identification of problems and overcome the region adopt a unified anomaly threshold to idendity the difficulties caused by abnormal, according to geological and lithology with the factor scores reflect lithology map. Division conducted the study area, partition standardization method is used in extracting geochemical anomaly for verification and have been achieved good results.Alteration of remote sensing information is a direct characterization of mineralization can be a sign that they will attribute the various layers and geological, geochemical corresponding layer of organic link, identification and the identification of abnormal prospection information favorable for the establishment of integrated information provide the basis for exploration model; geochemical anomaly information while the smallest catchment basin as the basic unit, will be layers of geochemical anomalies were charged with various geological signs mine layers and layers, and other points related to deposit, superimposed space, Research in a typical deposit mineralization points, or benefit lots of geochemical anomalies on the characteristics of various types of geochemical anomalies and ore-controlling factors and the related point of the deposit space coupling of the various types of anomalies and to clear the area of research and mineralization. The relationship between the product and thus can determine the most favorable prospecting and unusual combination of elements, and optimized evaluation of abnormal signs variables. Use of RS and GIS platform, coupled with a package based on the relationship between the alteration of remote sensing abnormal layer, the combination of abnormal layer of geochemical, geological layers for projection transformation and coordinate registration. The vector-grid or grid-grid overlay, linear sets, IHS transform and two-dimensional and related coding technology were used in the study area, based on the pixel-level and features-level fusion research, study the information of remote sensing and geochemical exploration and extract the comprehensive anomaly information, the research abnormal shape, unusual strength, abnormal distribution of space exploration and its siginificance, and so on. The anomaly information extracted is well consistent with the given mineral points in study area, it is not only has instructed the metal of the occurrence of location, but also for the discovery of new mineralization provide the useful information, it has good value and significance of practical applications and it has provided an important basis for the integrated prospecting positioning forecast , it proves the remote sensing and geochemical exploration fusion is the important method in integrated prospecting.