地面高精度磁法在青海大沙龙铁矿勘查中的应用

大沙龙铁矿区位于北祁连洋壳沉积带西段,走廊南山复背斜轴部南翼。属北祁连Cu-Pb-Zn-Fe-Cr-Au-Ag硫铁矿—石棉成矿带。区内广泛分布有奥陶纪火山沉积岩,岩层褶皱紧密,断裂发育,其西南侧为柴达诺山花岗岩体,矿区内有较多脉岩分布。据钻孔资料,深部见隐伏超基性岩体。根据大沙龙铁矿床特征及矿石中有用组分和伴生元素的特点,在前人工作成果的基础上,以地质工作与物探工作相结合的勘查手段,配以山地工程及各项分析测试手段,较全面系统地评价大沙龙矿床。地磁异常反演解释及钻探深部验证是找矿发现的关键。

Exploratory application and experience of high-accuracy ground magnetic survey in Dashalong iron deposit, Qilian County, Qinghai

The Dashalong iron deposit is located in the west of North Qilian oceanic crust sedimentary belt, and the south anticlinal axis wing of Zoulangnanshan mountain. It belongs to the North Qilian Cu-Pb-Zn-Fe-Cr-Au-Ag-asbestos metallogenic belt. In the area, the Ordovician volcanic sedimentary rocks are widely distributed and fracture is well developed .The Chaidanuoshan granite is located in southwest, which vein rock is developed in. The Concealed ultrabasic rock are found in deep borehole. According to deposit characteristics and the useful components and associated elements, combine with previous work-achievements, the combination geological and geophysical work and all kinds of constructions and testing instruments, we comprehensively and systematically studied on Dashalong deposit .It is concluded that geomagnetic anomaly inversion and deep drilling verification are key of ore prospecting.