高精度航磁资料在冶山铁矿找矿潜力扩大中的应用

Application of the High-Precision Aeromagnetic Data to Expanding Prospecting Potential of the Yeshan Iron Deposit

在最新的1∶2.5万高精度航磁测量成果基础上,采用化极、延拓、小波多尺度分解、径向功率谱分析等方法,对冶山铁矿一带航磁异常进行了处理。重新厘定了冶山铁矿的成矿母岩—冶山岩体的分布及延深,新厘定分布范围约为出露区的70倍,推测延深在4000m以上。分析认为,冶山铁矿区矿体埋深主要在220m^860m,1300m深度以下基本无矿体存在。在矿区外围圈出10个找矿有利异常,其中北矿段北西方向的5个异常推测为矿致异常,具备良好的找矿潜力;铁石岗矿段南西方向5个有利异常主要由辉石二长岩和闪长岩引起,但其中仍可能有铁磁性矿产存在。

According to the latest high - precision 1 ： 25000 aeromagnetic measurement, using some methods such as RTP, upward continuation, wavelet multi - scale decomposition and radial power spectrum analysis, this work processes the aeromagnetie anomalies around the ~eshan iron deposit. Then it determines the distribution and downward extension of the Yeshan rock that is mineralization medium of the deposit. The new inferred range of the Yeshan rock is about 70 times the exposed area, and extends downward to depth over 4000m. Yeshan iron ores are mainly present at 220m ~ 860m depths, and largely no existence below 1300m. It has delimited 10 favorable anomalies around the Yeshan deposit, five of which located northwest of the north mine section are mine - induced anomalies, and likely have great prospecting potential. The other five located south of the Tieshigang section are mainly caused by pyroxene monzonite and diorite, where still possibly exist ferromagnetic minerals in the rock.