Comparison and Application of Extraction Methods for Aeromagnetic Anomaly Caused by Deep Magnetite:A Case Study of the Qihe-Yucheng Ore Area,Shandong
The large depth that the magnetite is buried and the long distance of aeromagnetic survey always leads to a weak signal of magnetic anomaly.In addition,due to that the deep magnetite mostly is formed through contact metasomatism caused by magmatic intrusion,the magnetic anomalies sourced from the source rocks and orebodies are always coupled and interfered with each other.This is challenging to directly delineate the target area for the deep magnetite orebody from the original map of aeromagnetic anomaly.Previous studies show that potential field separation technology is an effective approach to extract ore-caused anomalies.Howev-er,there are many potential field separation methods and they are all different,in terms of operation conven-ience and different results of extraction.In this paper,we systematically compared and analyzed the conven-ience of six commonly used separation methods,and evaluated the effects of extracting ore-caused anomalies from both the whole and target regions.Consequently,we established the theoretical model and verified the fea-sibility extracting the deep ore-caused anomalies based on the geologic background of the Qihe area,Shandong.At the end,we recommend using the marker profile line to verify the extraction effect of ore-induced anomalies when the measured data were processed.The ore-caused anomalies extracted agree with the known drilling da-ta,indicating a strong correlation between the extracted and realistic anomalies.This study provides a reference for future delineation of target ore fields and laying-out of drilling locations.
sinoprobemagnetiteaeromagnetic surveypotential field separationdelineation of target areas
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