Integrated interpretation of dual frequency induced polarization measurement based on wavelet analysis and metal factor methods
(1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education, Central South University, Changsha 410083, China;2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;3. Beijing Donia Resources Co., Ltd, Beijing 100012, China)
Abstract: In mineral exploration, the apparent resistivity and apparent frequency (or apparent polarizability) parameters of induced polarization method are commonly utilized to describe the induced polarization anomaly. When the target geology structure is significantly complicated, these parameters would fail to reflect the nature of the anomaly source, and wrong conclusions may be obtained. A wavelet approach and a metal factor method were used to comprehensively interpret the induced polarization anomaly of complex geologic bodies in the Adi Bladia mine. Db5 wavelet basis was used to conduct two-scale decomposition and reconstruction, which effectively suppress the noise interference of greenschist facies regional metamorphism and magma intrusion, making energy concentrated and boundary problem unobservable. On the basis of that, the ore-induced anomaly was effectively extracted by the metal factor method.
Key words: dual frequency induced polarization method; wavelet analysis; metal factor; Arabian-Nubian shield; volcanogenic massive sulfide deposit