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| Weak magnetic anomalies characteristics and its recognition in Xu-Su arcuate structure (north of Anhui section) |
| HE Liuchang, CHAN Siwei |
| Geological Exploration Technologies Institute of Anhui Province, Hefei 230031, China |
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Abstract The main tasks of metallogenic background survey of gold polymetallic deposit in Xu-Su arcuate structure (north of Anhui section) are ascertaining the occurrence status of concealed rock bodies in Xu-Su arcuate structure (north of Anhui section), delineating the contact area between rock bodies and surrounding rocks and the target area, and speculating the ore bearing position. The Xu-Su arcuate structure (north of Anhui section) is a weak magnetic anomaly area, and the measured magnetic anomalies are disordered and difficult to recognize. Through multi-parameter transformation process, such as reducing to the pole, moving average, matched filtering, vertical first derivative and upward continuation, the authors extracted low anomaly of the regular shape and easy identification from the weak magnetic anomalies. The processing results were screened and compared. Then the abnormal magnetic features which are favorable for geological interpretation were screened out. The results show that weak magnetic anomalies are superimposed anomalies in NW extension and have large coverage areas. Secondary anomalies are in NNW-NE direction and the west convex arc extends to the Qian’oupan. According to the geological background of Xu-Su arcuate structure (north of Anhui section) and the magnetic parameters of rocks (ores), and through the comparative analysis of measured magnetic anomalies and magnetic anomaly characteristics of Qian’oupan diorite-porphyrite, the authors speculated that the low anomalies are caused by the concealed intermediate-acid complex rocks. The research provides some reference for the comprehensive interpretation of the metallogenic background survey of gold polymetallic deposit in Xu-Su arcuate structure (north of Anhui section) and the delineation of the target area.
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Received: 18 September 2017
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2018, Vol. 5 
