物探化探计算技术2012，Vol.34Issue(3)：288-294,7.DOI:10.3969/j.issn.1001-1749.2012.03.09
用解析延拓求取剩余磁异常来圈定浅部隐伏磁铁矿脉
EXPLORING SHALLOW BURIED MAGNETITE VEINS BY RESIDUAL MAGNETIC ANOMALIES WITH ANALYTIC CONTINUATION
摘要
Abstract
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.关键词
剩余磁异常/解析延拓/隐伏磁铁矿脉/秘鲁/Morritos铁矿Key words
residual anomaly, analytical continuation, insidious magnetite veins, Peru, Morritos Fe deposit分类
天文与地球科学引用本文复制引用
李建华,李春鹏..用解析延拓求取剩余磁异常来圈定浅部隐伏磁铁矿脉[J].物探化探计算技术,2012,34(3):288-294,7.基金项目
国家自然科学基金(40827002) （40827002）
