Research On Metallogenic Prognosis Of Multi-source Data Based On RS & GIS

The use of multi-source data for comprehensive metallogenic prediction is an important means of prospecting.Remote sensing images can provide large-area macroscopic observations of the study area,provide continuous and intuitive ground distribution,and are not affected by time or area.It is an important data source for interpreting geological phenomena.The spectral features of remote sensing images can reflect mineral alteration information.The use of multispectral remote sensing data to extract mineral alteration areas can indicate possible metallogenic areas.GIS has a powerful spatial analysis function,which can process,analyze,integrate,and display multi-source geographic data information,and produce various thematic maps that meet the needs.The combination of RS and GIS technology for regional geological and mineral exploration is an indispensable means in the current ore prospecting task.This article uses the Luozha region of Tibet as an example.The region has complex geological conditions,deeper cuts in the valleys,higher elevations,snow accumulation in parts of the region,and poor roads.The predecessors did not carry out in-depth work.This paper selects Spot6-MS and Landsat8-OLI remote sensing images,obtains orthophoto maps through remote sensing image processing,and interprets them geologically by remote sensing.Terra-ASTER remote sensing images are selected according to the geological background data of the study area and major alteration types of regional metallogenic belts.The remote sensing alteration and anomaly extraction was carried out;in combination with previous work,topographic maps,regional geological maps and reports,regional chemical anomaly distribution maps,regional geology and mineral resources,etc.,the ore-forming factors affecting the area were extracted.The GIS platform was used to comprehensively process and analyze the metallogenic factors affecting ore production,and a special map of 1:50000 metallogenic prospective areas in Luozha,Tibet was produced.The main research results and knowledge obtained in this paper are as follows:1.The Spot6-MS and Landsat8-OLI remote sensing images of the study area were acquired to carry out remote sensing image processing,including geometric correction,image mosaic,image cropping,image fusion,image stretching,etc.The Spot6-MS,Landsat8-OLI,and Spot6-MS were prepared separately.Landsat8-OLI fusion remote sensing orthophoto map.2.The Terra-ASTER remote sensing image of the study area was acquired and remote sensing image processing was carried out,including atmospheric correction,geometric correction,image mosaic,image cropping,masking,spectral analysis,extraction of eigenvalues,etc.,and an anomalous distribution map of metal ion mineral alteration in the study area was produced.Carbonate ion mineral alteration anomaly distribution map,silicate ion mineral alteration anomaly distribution map and remote sensing integrated alteration anomaly distribution map.3.Conduct remote geological interpretation of the study area and confirm field lithology and structure distribution through field verification,and completed a total of 23 stratigraphic units,2 magmatic rock units,5 informal stratigraphic units and major The remote sensing interpretation of the structure has produced a 1:50,000 remote sensing geological interpretation map for the study area.4.Collect topographic maps,regional geological maps,geochemical anomaly distribution maps,and regional mineral distribution maps in the study area,combining remote sensing image maps,remote sensing geological interpretation maps,and remote sensing alteration anomaly maps to establish a multi-source geoscience Information database in Luozha,Tibet.5.Combine predecessor data,expert knowledge and experience,field survey phenomena,and consult relevant literature to evaluate the factors affecting mineralization in the study area,use the analytic hierarchy process to comprehensively analyze the factors affecting ore-forming factors,and calculate the impact mineralization The weight of the factor.In the GIS platform,comprehensive processing,analysis,and superposition of various affecting ore-forming factors were carried out,and six metallogenic prospects were delineated.Through field verification,it was confirmed that copper-lead mineralization occurred in the No.1 metallogenic prospect.