激电测深法在印尼塔里阿布岛铅锌多金属矿区勘查中的应用
Application of induced polarizationsounding method in exploration of the Lead-Zinc polymetallic mining area on taliabu Island, Indonesia
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摘要: 利用直流激发极化法对称四极测深装置对印尼塔里阿布岛铅锌多金属矿化地段进行勘探,结合该区地质特征、成矿规律及岩层地球物理特征,获得该矿区铅锌矿体(化)的产状及规模信息。研究表明,该矿区矿体的低阻高极化异常特征与围岩差异显著。采用RES2DINV电法二维反演软件对测深剖面进行反演处理,在反演时加入剖面地形数据,可有效制约地形起伏对异常体形态及埋深的干扰,提高数据处理的精确度。依据激电测深数据反演结果并结合物性工作成果,对测深剖面进行地质解译推断。利用I线剖面布置的槽探及钻探工程对解译推断成果进行验证,结果表明,见矿位置及产状规模与物探解译推断成果吻合度较高,激电测深法在该区多金属勘查中取得了较好的应用效果。Abstract: The Induced Polarization(IP)sounding method was employed to perform the exploration in the Lead-Zinc polymetallic mining area on Taliabu Island, Indonesia. Combined with geological features, mineralization regularity and geophysical feature of rocks, this study obtained the occurrence and scale of the Lead-Zinc polymetallic ore bodies. The results show that the orebodies of low resistance and high polarization are significantly different from the country rocks. The sounding section inversion was carried out using 2-D inversion software RES2DINV. Addition of topographic data of the section has effectively constrained the interference of wavy terrain on the shape and depth of the abnormal bodies and improved the accuracy of data processing. The sounding section was interpreted geologically based on the results of IP sounding inversion and study of physical property. The trenching and drilling in Line I was used to verify the interpretation results. The results reveal that the actual location, shape and scale of the ore bodies are well coupled with the geophysical interpretation results. IP sounding has yielded better application in the exploration of the polymetallic mining area.