时间域航空电磁、航磁在五龙沟金矿整装勘查区中的应用研究

发布时间：2018-10-09 10:41

【摘要】：五龙沟金矿整装勘查区地处青藏高原中北部,开展地面电磁法难度大.以直升机为平台搭载VTEM系统,在整装勘查区东南缘开展了1∶1万时间域航空电磁、航磁测量,结果显示矿体航电异常明显,呈双峰、高时间常数和低阻特征;同时,矿体处于-60~-40 n T的负磁场梯度带上,周围可见局部升高5~10 n T的低幅磁异常.对该航电异常进行板状体反演,板状体埋深、规模和产状等参数与后续收集到的矿体产状等信息基本一致,表明该方法对已知构造蚀变岩型金矿反映好.结合地质、化探等资料,建立了构造蚀变岩金矿的找矿模型,圈定了靶区6片,其中1片经钻孔验证发现隐伏矿体.时间域航空电磁、航磁对构造蚀变岩型金矿找矿效果好,能克服地面电磁法受制于高海拔、复杂地形等恶劣条件影响的诸多困难,可用于勘查区已知矿区深边部和空白区的"攻深找盲"以及其他地区的金及多金属矿勘查工作.
[Abstract]:Wulonggou gold mine is located in the north of Qinghai-Xizang Plateau, so it is difficult to develop surface electromagnetic method. Taking the helicopter as the platform and carrying out VTEM system, the aeronautical electromagnetic and aeromagnetic measurements in the 10 000 time domain were carried out at the southeast edge of the whole exploration area. The results showed that the aero-electric anomaly of the orebody was obvious, with two peaks, high time constant and low resistance. At the same time, The orebody is located in the negative magnetic field gradient zone of -60 ~ 40nT, and a low-amplitude magnetic anomaly with local elevation of 5 ~ 10nT can be seen around it. The inversion of the avionics anomaly shows that the parameters such as the buried depth, size and occurrence of the plate body are basically consistent with the orebody occurrence collected later, which indicates that the method is good for the known structural altered rock type gold deposits. Combined with geological and geochemical data, a prospecting model of structural altered rock gold deposits has been established, and 6 targets have been delineated, one of which has been verified by drilling and found hidden orebodies. In time domain, aeromagnetic and aeromagnetic are effective in prospecting for structural altered rock type gold deposits, and can overcome many difficulties that the surface electromagnetic method is restricted by the bad conditions such as high altitude, complex topography and so on. It can be used for the exploration of gold and polymetallic deposits in known mining areas and blank areas.
【作者单位】：核工业航测遥感中心;中核集团铀资源地球物理勘查技术中心(重点实验室);青海省有色地质矿产勘查局八队;
【基金】：青海省地质调查局青海省石头坑德—五龙沟地区1∶1万航空电磁法测量项目(2014.4.25)资助
【分类号】：P618.51;P631.326

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