内蒙古克什克腾旗赛汉敖包铅锌矿区等值反磁通瞬变电磁试验研究

Experimental Study On The Opposing Coils Transient Electromagnetic Method Of Saihan Aobao Lead-Zinc Deposit In Hexigtengqi Inner Mongolia

克什克腾旗-乌兰浩特是大兴安岭西南段一条重要的铁、铜、铅、锌、银、锡、钼多金属成矿带,赛汉敖包铅锌矿区位于该成矿带的西南端,是受断裂构造控制的中低温热液充填式铅锌多金属矿床。利用等值反磁通瞬变电磁系统,对已知主要矿体地段开展的地表垂向和坑道水平测深试验研究结果表明,电阻率反演结果对于表现为低阻特性的构造破碎带、矿化蚀变体、富水裂隙等有较好的反映,结合已有勘查成果分析及认识,圈定了6处与已知见矿地段及地层,不整合面相关的透镜体状中低阻凹陷或高低阻渐变异常带,为后续钻探部署提供了依据。

Hexigteng-Ulanhot is an important Fe-Cu-Pb-Zn-Ag-Sn-Mo polymetallic metallogenic belt in the southwest of the Greater Xing’an Range.Saihan Aobo Pb-Zn deposit,located in the southwest of the Hexigtengqi-Ulanhot polymetallic metallogenic belt.It is a medium-low temperature hydrothermal filled Pb-Zn polymetallic deposit,controlled by fault structure.The results of surface vertical and tunnel horizontal sounding tests conducted on known major ore body areas by opposing coils transient electromagnetic method(OCTEM)show that resistivity inversion results can well reflect the structural fracture zone,mineralized corrosion variant and water-rich fissure with low resistivity characteristics.Combined with the analysis and understanding of previous exploration results,Six lens-shaped depressions with medium and low resistance or high and low resistance gradient anomaly zones related to known ore-finding and stratigraphic unconformity were delineated,which provided a basis for subsequent drilling deployment.