Geophysical characteristics and deep prospecting prediction of the Dachaigou gold deposit in the eastern Kunlun area
The eastern Kunlun metallogenic belt,as a significant metal metallogenic belt in China,hosts extensive orogenic gold depos-its and large-scale Kunlunhe,Gouli,and Wulonggou gold concentration areas.The Dachaigou gold deposit is a large-scale gold deposit newly discovered in the Wulonggou gold field in recent years.Despite its high metallogenic potential,the western extension of its ore belt has not been defined.Hence,this study conducted induced polarization(IP)sounding and wide-field electromagnetic sounding in the deposit.The results show that the known ore belt is situated in the regional gravity anomaly gradient zone,the transition zone of positive and negative weak magnetic anomalies,the edge of IP anomalies,or the electrical gradient zone.The development zone of the regional tectonic belt resides in the large-scale IP anomaly section.The regional tectonic belt is characterized by a wide range of low-re-sistivity anomaly zones.The Ⅳ and Ⅲ alteration zones of the known ore belt are located in the opening position of the low-resistivity a-nomaly zone and the shallow electrical anomaly gradient zone,respectively.Based on the above understanding and the electromagnetic anomaly change patterns of several parallel profiles in the western extension segment,it was inferred that the regional ore-controlling structure extends steadily in the W-NWW direction,forming a favorable prospecting space in the western extension segment of the de-posit.The results of deep geophysical exploration in the Dachaigou deposit indicate that geophysical methods manifest significant advan-tages in deep geological prospecting research,providing successful experience for deep prospecting in the eastern Kunlun gold deposit area.
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