Remote Sensing Alteration Information Extraction And Metallogenic Prediction In Datong–Muzhen Area,Tongling

Mineral resources are the important natural resources, for our country’s economicconstruction of all walks of life, especially the development of heavy industry, to providethe necessary material basis and guarantee. At present the situation of mineral resources aremore less than the need, and the existing mineral resources can’t satisfy the need ofeconomic development. Looking for new mineral resources has become the importantcondition to ensure national sustainable economic development.Remote sensing is an emerging technology developed in the early1960s, with a largeof information, macro, fast characteristic. Remote sensing image can be intuitive andrealistically reflects the image characteristics and their distribution law of all kinds ofgeological elements, effectively reveals concealed structures, displays activities structure,access to the surrounding rock mineralized alteration information of the land surface, toprovide the basis for ore exploration. Application of remote sensing technique in resourcesexploration, compared with the traditional prospecting method, can save time and cost, andovercome such difficulties as climate conditions, supply difficulties, where the complexterrain can’t work, in field operations, and other advantages, has become a new method forprospecting.This dissertation focuses on the prospecting mark of nearly ore wall-rock alteration,extracting mineralized alteration anomaly information from landsat TM remote sensingimage in Datong-Muzhen area, Tongling, Anhui, then combined with geologicalinterpretation results to prospect. In this dissertation, the main research contends andconclusion are in the following:1Firstly, remote sensing images in the study area is preprocessed including atmospherecorrection and geometric correction, and according to the statistical characteristics ofTM remote sensing data to select the best band combination for false color synthesis.And the image is enhanced by histogram equalization and edge detection. Thenaccording to TM image remote sensing image characteristics with geological dataand field survey, the interpreting marks of stratigraphic lithology are established, andthe stratigraphic lithology, the linear and ring structures information are extracted by visual interpreting, then the strata interpretation map, linear and ring structuresinterpretation map are made.2Based on the analysis of the objects’ spectral characteristics in the study area, theinterference factors for altered information extraction such as water, vegetation,settlements the quaternary strata using mask technology,.3Using ratio processing, principal components analysis as well as the combination ofboth methods to extract altered anomaly information in study area, and the resultsare compared, and concludes that in the study area principal component analysis isgood for the enhancement of hydroxyl altered, and the combination method by ratioand principal component analysis is good for the enhancement of iron altered, theextracted mineralized alteration information can be used as remote sensingprospecting signs.4The favorable metallogenic area is discussed by multi-source data overlay analysisusing the existing geological data, geological interpretation results and alteredinformation extraction results.