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青海省尕林格铁多金属矿区第四系覆盖层近200m,主要以铁矿为主,铜、钴、铅锌多金属矿伴生,进行地面高精度磁测是最直接而有效的方法。但由于地面覆盖层厚,矿体埋深大,使磁异常形态简单,难以分析和判断磁性体的空间位置和分布特征,加大了钻孔的布设和施工的盲目性。笔者通过对尕林格Ⅲ矿区的磁异常进行分量转换,提取垂直分量Za,对Za曲线特征进行分析,判断磁性体的赋存位置,指导地质布孔,提高了见矿命中率,在寻找铁矿体方面取得了明显的效果。
The Quaternary iron-gold polymetallic deposit in Qinghai Province has nearly 200 m of Quaternary overburden. It is mainly composed of iron ore and is associated with copper, cobalt and lead-zinc polymetallic mines. It is the most direct and effective method to carry out high-precision ground magnetic surveys. However, it is difficult to analyze and determine the spatial location and distribution characteristics of magnetic bodies because of the thick ground cover and the large buried depth of the ore body, which makes the magnetic anomaly form simple and increases the blindness of the layout and construction of the borehole. Through the component conversion of the magnetic anomaly in the mining area Ⅲ, we extract the vertical component Za, analyze the characteristics of the Za curve, judge the location of the magnetic body, guide the geologic holes and improve the mine hit rate. When looking for iron Ore has made significant achievements.