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| The application of integrated geophysical exploration technology to the prospecting for porphyry silver-molybdenum polymetallic deposits |
| LU Gui-Fu, MI Hong-Zhe, LIU Rui-De, LIN Tian-Liang |
| Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China |
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Abstract Every kind of geophysical exploration method has the problem of multiple solutions. In order to improve the reliability of interpretation results, give full play to the advantages of each method, and make the best of geological exploration results, the authors conducted integrated exploration of ore deposit and geology in the Jiazishan area, which included high precision magnetic method, IP measurement and controlled source audio-frequency electromagnetic sounding geophysical prospecting, thus achieving good exploration results. Drilling verification demonstrated that at the depth of 765 m there exists an ore layer 26 m in thickness, with the highest grade of molybdenum being 5%. The low-resistivity zone detected by controlled source audio-frequency magnetotelluric sounding can be regarded as good geophysical prospecting marks, and the apparent chargeability anomaly of IP medium gradient and the gradient belt of high precision magnetic survey can also serve as important indicators for ore-prospecting. Therefore, the combination of CSAMT anomaly, apparent chargeability anomaly and high-precision magnetic anomaly can serve as an important criterion in search for concealed silver and molybdenum orebodies. The use of integrated geophysical exploration methods has a guiding significance in mineral exploration of this area.
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Received: 20 February 2014
Published: 10 August 2014
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