Application of integrated geophysical methods in gold deposit prediction:A case study of Zhengjia gold deposit in Jiaodong area
Jiaodong area of Shandong Province is rich in gold resources and has great ore-forming potential.However,the geological outcrop condition is poor in the southward extension area of Jiaojia fault,which is the main ore-controlling structure,and the deep fault extension is unknown,seriously restricting the progress of ore prospecting.A joint exploration and application study was carried out using high-precision magnetic prospecting,longitudinal intermediate gradient IP profiling and IP sounding in Zhengjia area of Laizhou City in Shandong Prov-ince.A three-dimensional geophysical model was established,and a comprehensive interpretation of anomaly ar-eas and metallogenic prediction were earried out,combined with borehole and geological data.The deep electrical structure of the southern section of Jiaojia fault was preliminarily determined to be NE trend,with a slight dip to the east,and the favorable locations for mineralization were middle-shallow tectonic fracture zone and the change site of the fault occurrence.Because gold minerals mainly occur in pyrite,chalcopyrite and quartz,the geophysi-cal prospecting direction should be a tectonic fracture zone with high apparent polarizability anomaly.The feasibil-ity of integrated geophysical prospecting in gold deposit prediction was verified in this paper,and it also could pro-vide some references for the selection of prospecting means under similar geological conditions.
magnetic prospectinginduced polarization3D geophysical modelmetallogenic predictionappar-ent resistivity
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