地面高精度磁法测量在北苏丹国哈马迪金矿勘查中的应用

北苏丹国哈马迪金矿区位于新元古代泛非造山运动时期地壳增长形成的阿拉伯-努比亚地盾的西南端,处在古地块拼接缝合带上,具备较好的成矿远景。为了扩大哈马迪金矿区及外围的地质找矿效果,利用地面高精度磁测方法,对矿区及外围进行了扫面,通过研究了解哈马迪金矿区隐伏的控矿构造和含矿蚀变破碎带的分布特征,利用磁测异常追索和圈定出含金蚀变片理化带。同时,对比分析已知金矿床(体)磁场特征,建立了哈马迪矿区地质-地球物理找矿模型,进行深部盲矿体预测。在重点区段实施初步工程验证,取得了较好的找矿效果,从而说明地面高精度磁法测量在哈马迪矿区间接找寻金矿的可行性和有效性。

Application of the Ground High-Precision Magnetic Measurement to the Reconnaissance of Hamadi Gold Deposit in North Sudan

Hamadi gold deposit, North Sultan, is located in southwest of Arab-Nubian, which is formed by crustal growth during the Neoproterozoic pan-African orogenic period. It is situated on the splicing structure zone of Kerns, where could be preferable matallogenic prospected area. In order to improve the geological prospecting ef-fect of Hamadi gold deposit and its periphery, we scanned this area by the ground high-precision magnetic mea-surement, and established the geology-geophysics prospecting model of Hamadi ore field to forecast the deep blind ore-bodies through studying the distribution of the concealed ore-control structure and ore-bearing altered fracture zone, tracking and delineating the gold-bearing alteration schistosity zone by utilizing magnetic anomaly, and analyzing contrastively the magnetic anomaly characteristics of the known gold deposits (bodies). The drill-ing engineering verification shows that there is a good discovery. So, we can conclude that the Ground High-Pre-cision Magnetic Measurement is a feasible and effective method for exploring gold ore indirectly in the Hamadi ore field.