摘要
黔西北地区铅锌矿的勘查已经进入攻深找盲阶段,常用物探方法在该区是否可以发现300~1000 m或更深的铅锌矿致异常,是很多贵州物探工作者正在思考和探索的一个重要课题,问题的解决与否对于该区目前及今后的找矿工作具有很强的现实意义。根据时间域激发极化法测深的理论,认为在使用大功率、合适的装置和延时等参数条件与深部隐伏盲矿耦合较好的情况下,可以发现大于300m深部铅锌矿致异常。为证实该方法深部应用的可行性,作者在黔西北赫章洗线沟已知铅锌矿体上开展了不同装置、不同供电周期的大功率激发极化法测深试验。试验结果表明,采用加密等比装置测量方式,选择合适的极距,在采用供电周期为32 s,延时为200 ms,采样宽度200 ms时,可以发现较好的深部铅锌矿异常,等比对称四极测深MN/AB=1/10,取深度校正系数为0.41进行反演,可以准确确定异常位置,值得在该区推广使用。
The exploration of lead-zinc ore in the Northwestern Guizhou has been currently focused on the concealed Pb-Zn resources in depth of the area. Whether found the geophysical anomalies, caused by the lead-zinc mineralization, could be detected or discovered at depth of 300-1000 m or even deeper place in this area by using normal geophysical prospecting methods is an important research topic which is currently considered by many geophysical prospecting workers in Guizhou Province. Whether the problem could be solved or not is of great practical significance to the present and future prospecting work of Pb-Zn resources in this area. Based on the theory of time-domain induced polarization sounding method, we have believed that under the condition of better coupling between the parameters, including high power, suitable device, and delay timing, and concealed orebodies in depth, the anomalies caused by lead-zinc orebodies in depth of higher than 300 m can be found. In order to verify the feasibility of this method applied to the mineral exploration in depth, we have carried out the high-power induced polarization sounding test by using different devices and different times of power supply cycles on the boreholes of known orebodies in the Xixiangou lead-zinc deposit in Hezhang of the Northwestern Guizhou in this paper. The test results show that good anomalies, caused by Pb-Zn orebodies in depth, can be outlined with the data obtained by using the encryption unequal ratio device measurement method of the IP ladder under conditions including the suitable distance of electrodes, the power supply cycle time of 32 s, the delay time of 200 ms, and the sampling width of 200 ms. The locations of IP anomalies inverted by using data of the isometric symmetrical quadrupole sounding measurement of IP under MN/AB=1/10 and depth correction coefficient of 0.41 can be accurately determined. Therefore, this method is worth to be promoted for applying into the exploration of Pb-Zn resoces in this area.
作者
卢卯
黄凯
蒋海民
曾道国
蒲庆隆
唐永永
LU Mao;HUANG Kai;JIANG Hai-min;ZENG Dao-guo;PU Qing-long;TANG Yong-yong(Institute of Geology and Mineral Resource Exploration,Non-Ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou,Guiyang 550005,China;State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China)
出处
《矿物学报》
CAS
CSCD
北大核心
2020年第4期502-509,共8页
Acta Mineralogica Sinica
基金
国家自然科学基金项目(编号:U1812402,41430315)。
关键词
时间域激发极化法
加密等比装置
深度校正
洗线沟铅锌矿
The time-domain induced polarization method
encryption unequal ratio device
depth correction
the Xixiangou lead-zinc deposit
