A stable downward continuation of airborne magnetic data: A case study for mineral prospectivity mapping in Central Iran
作者： Maysam Abedi , Ali Gholami , Gholam-Hossain Norouzi
DOI: 10.1016/J.CAGEO.2012.11.006
关键词:
摘要: Previous studies have shown that a well-known multi-criteria decision making (MCDM) technique called Preference Ranking Organization METHod for Enrichment Evaluation (PROMETHEE II) to explore porphyry copper deposits can prioritize the ground-based exploratory evidential layers effectively. In this paper, PROMETHEE II method is applied airborne geophysical (potassium radiometry and magnetometry) data, geological (fault host rock zones), various extracted alteration from remote sensing images. The central Iranian volcanic-sedimentary belt chosen study. A stable downward continuation as an inverse problem in Fourier domain using Tikhonov edge-preserving regularizations proposed enhance magnetic data. Numerical analysis of synthetic models show reconstructed data at ground surface exhibits significant enhancement compared reduced-to-pole (RTP) analytic signal filters are better maps anomalies. Four including argillic, phyllic, propylitic hydroxyl alterations Advanced Spaceborne Thermal Emission Reflection Radiometer (ASTER) images order map altered areas associated with deposits. Principal component (PCA) based on six Enhanced Thematic Mapper Plus (ETM+) implemented iron oxide layer. final mineral prospectivity desired geo-data set indicates adequately matching high potential zones previous working mines
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