用解析延拓求取剩余磁异常来圈定浅部隐伏磁铁矿脉

用解析延拓求取剩余磁异常来圈定浅部隐伏磁铁矿脉

李建华;李春鹏

【期刊名称】《物探化探计算技术》

【年(卷),期】2012(034)003

【摘要】Residual anomaly calculation is one high-pass filtering method by extracting shallow media induced anomaly by pole reduction and continuation. For magnetite veins surrounded by rocks with strong magnetic, the anomaly induced by shallow magnetite veins always covered by huge magnetic surrounding rock. Magnetic field strength is inversely proportional to the square (two-dimensional) or cubic(three-dimensional) of the distance between the station and the source. The high-frequency anomalies induced by shallow magnetic sources fade faster than low-frequency anomalies induced by deep sources. Therefore, when the field with analytic upward continuation is removed from the measured magnetic field, the residual anomalies can reflect shallow magnetic bodies with high-frequency anomalies. The residual anomaly is calculated by analytical continuation to extract the anomaly induced by shallow magnetite veins for exploring insidious magnetite veins in this paper. Furthermore, several insidious magnetite veins are found by this method on Morritos magnetite deposit in republic of Peru. It is validated to use this method exploring insidious magnetite veins surrounding huge magnetic rock.%剩余磁异常求取是一种对磁场强度进行化极,解析延拓后提取浅部磁性介质

异常的高通滤波方法.对于处于强磁性围岩的磁铁矿脉来说,浅部磁铁矿脉的异常往往被大规模的磁性围岩所引起的异常所掩盖.磁场强度与场源到测点距离的平方(二度体)或者立方(三度体)成反比,进行向上延拓的时候,由浅部场源引起的高频异常衰减快,深部场源引起的低频异常衰减的慢,因此地面实测磁场去掉向上解析延拓后的磁场值,可突出反映近地表磁性体引起的高频异常.这里通过解析延拓求取剩余异常,实现浅部磁铁矿脉异常信息的提取,为寻找隐伏的磁铁矿脉提供依据.并且利用此方法在秘鲁共和国Morritos铁矿圈定隐伏磁铁矿脉,验证了剩余异常在大规模的高磁性围岩中寻找隐伏磁铁矿脉的应用效果.

【总页数】7页(P288-294)

【作者】李建华;李春鹏

【作者单位】中南大学地球科学与信息物理学院,湖南长沙410083;中南大学地球科学与信息物理学院,湖南长沙410083

【正文语种】中文

【中图分类】P631.2

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