东昆仑成矿带某隐伏矿激电响应特征及成矿预测

Characteristics of induced polarization response and metallogenic prediction in a concealed ore of Eastern Kunlun area

在青藏高原高寒区对东昆仑矿集区某斑岩型铜铁矿利用激电数据进行了快速评价及成矿预测。利用先平面后剖面的地质工作方法:首先通过中间梯度法装置进行了平面测量,数据利用距离加权反比插值法进行了插值绘图;接着利用对称四极装置测深法进行了典型剖面的测量,数据采用有限单元法进行了正演模型构造与拟合计算,数据拟合误差幅频率达到0.58%,电阻率达到6.6%,清楚地划分了含矿异常带和围岩的分布,最后钻探验证效果明显。文章提及的数据采集、处理解释方法和思路,为在交通不便、高寒矿集区的地质找矿快速评价工作提供了参考。

The IP survey was conducted for rapid assessment and metallogenic prediction in a porphyry type copper-iron deposit located in the eastern Kunlun metallogenic belt. Firstly middle-gradient IP method was applied for plane survey,then inverse distance weighting method was used for interpolation and the contour map was plotted. After that, IP sounding profile was conducted based on the analysis result of the survey data. Then, the finite element method was used in forward model construction and data fitting calcula- tion. The fitting error of apparent frequency reached 0.58% and apparent resistivity reached 6.6%. The distribution of anomalous ore- bearing belt and surrounding rock was obviously outlined based on the data interpretation. The interpreted result was verified by the test drilling work, and the sounding prospecting result was achieved. The method used will provide reference for quick prospecting in the ar- ea with traffic inconvenience, high altitude and favorable mineralized information.