AMT-based geological-geophysical prospecting model for the gold ore zone in the Daduhe area,Shimian County,Sichuan Province
The gold ore zone in the Daduhe area of Shimian County,Sichuan Province,is located in the rare metal-precious metal-non-ferrous polymetal metallogenic belt in the southern segment of the Songpan-Ganzi orogenic belt.It exhibits complex structures and steep terrains,severely restricting prospecting and exploration.Based on the geological settings,conditions,and geophysical characteristics for regional mineralization,this study investigated the typical Luoluoping gold deposit in Shimian by conducting deep geophysical explo-ration centered on audio-frequency magnetotellurics(AMT).Three low-resistivity anomalies(M1,M2,and M3)were identified,cor-responding to the mineralized alteration zone Ⅰ,the gold mineralization zone Ⅲ,and the gold-copper ore body,respectively,demon-strating the effectiveness and applicability of geophysical methods for deep prospecting.Combined with geological understanding and engineering verification,this study summarized geological and geophysical prospecting markers for the typical gold deposit,establishing the geological-geophysical prospecting model for the gold ore zone in the study area.Therefore,this study provides technical support for deep prospecting in the study area.
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