Application of multiscale electromagnetic joint methods in deep karst detection in phosphorus pines in Guizhou Province
With the rapid development of the new energy industry and the continuous increase in grain demand,the exploitation of deep-seated phosphate resources is imminent.Guizhou,as a major province rich in phosphate resources with high grade and thick ore layers,has high mining value.However,the region exhibits typical karst landform features,with a total area of soluble rocks reaching 128,800 square kilometers,accounting for about 73%of the total area of the province.During the mining process,geological hazards such as blowouts and mud bursts are prone to occur,severely affecting project progress and development costs,and even causing casual-ties.Therefore,it is crucial to investigate the development of underground karst for phosphate mining.Combining the geological conditions of the study area with the characteristics of deep phosphate burial,this paper comprehensively applies spread spectrum induced polarization method and controlled source electromagnetic method for karst detection.The two methods complement each other's advantages and mutually confirm each other.Through qualitative analysis of the resistivity profiles obtained from inversion,the karst development areas are accurately delineated,providing reference for the next step of phosphate mining work and also offering beneficial references and guidance for geophysical work in karst development areas.
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