电法在西藏工布江达县某斑岩型铜矿勘查区的应用

Application of Electrical Survey on a Porphyry Copper Deposit Exploration Area of Gongbo'gyamda County,Tibet

介绍了西藏工布江达县某铜多金属矿勘查区物探测量效果。通过时间域激电中梯面积性测量,圈定出高极化率异常区一处,结合地质及物性资料推测为矿致异常。在此基础上,于异常浓集中心布设剖面运用对称四级装置进行测深工作,识别下伏矿体的展布形态并指导钻孔布设。通过工程施工验证了物探推论,取得良好的效果。测量成果对下一步的地质工程勘查起到了重要的指导作用,指出在该矿区运用电法寻找斑岩铜矿的思路及方法技术。研究结果对冈底斯成矿带及类似地区应用勘查地球物理方法探寻深部斑岩铜多金属矿具有重要的参考价值。

This paper introduces the effect of geophysical prospecting in a copper polymetallic ore exploration area in Gongbo＇gyamda County,Tibet.Through IP intermediate gradient area measurement,a high-polarizabi-lity anomaly region was delineated in the study area,and the anomaly related to ore deposits was inferred com-bined with geological and physical data.On this basis,the sounding profiles were distributed in the abnormal concentrate center used symmetrical four-pole device to detect the distribution of orebodies and guide the bore-hole layout.The drilling results verified the above geophysical inferences and achieved good practical effect;this survey results provided an important instruction on the next-step geological prospecting in this area.Fur-thermore,the characteristics of anomaly detected by IP sounding method were analyzed and the technology of IP sounding method was summarized to prospect porphyry copper deposit in the study area.This study provides a valuable reference for the application of geophysical prospecting method to explore the deep porphyry copper polymetallic ore in Gangdise metallogenic belt and the similar areas.