Application of wide-field electromagnetic sounding method to deep prospecting in the Mangling ore concentration area in North Qinling:A case study of the Yaozhuang ore district
The Mangling ore concentration area with intense magmatic activity has become a focal area for deep prospecting in the North Qinling tectonic belt in recent years.The formation of molybdenum deposits in this area is closely related to small Late Jurassic acidic intrusions.To achieve breakthroughs in deep ore prospection within this area,this study conducted the wide-field electromagnetic sounding over the concealed Yaozhuang intrusion delineated based on gravity anomalies.The results indicate the presence of pronounced high-resistivity anomalies at depth,and it is inferred that the protruding part of the anomalies corresponds to the concealed Yaozhuang intrusion.The resistivity inversion results roughly delineated the variations in the top surface of the intrusion,with the elevations and N-S width of the top surface estimated at-300～620 m and 1300～1600 m,respectively.Drilling in the most favorable deep mineralized part confirmed the presence of the concealed intrusion and concealed molybdenum ore bodies.The results of this study demonstrate that the wide-field electromagnetic sounding method exhibits great sounding depths and high resolutions,serving as an effective method for deep ore prospecting in the Mangling ore concentration area.
wide-field electromagnetic method(WFEM)deep explorationMangling ore concentration areaNorth Qinlingmolybde-num ore body
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