Electromagnetic anomaly characteristics and prospecting orientation in the Sangkaropi ore district,Indonisia
CHEN Jing1,2,3,4, WANG Wan-Yin1,2,3, WEN Shao-Guang5, GUO Wen-Bo4, LEI Xiao-Peng4, WEI Xiao-Hang4
1. Gravity & Magnetic Institute, Chang'an University, Xi'an 710054, China;
2. College of Geology Engineering and Geomatics, Chang'an University, Xi'an 710054, China;
3. Key Laboratory of Western China's Mineral Resources and Geological Engineering, Chang'an University, Xi'an 710054, China;
4. Geophysical and Geochemical Exploration Corporation, Bureau of Geological Exploration for Nonferrous Metals in Northwest China, Xi'an 710068, China;
5. Guilin Kaishan Mining technology Co., Ltd, Guilin 541000, China
The Sangkaropi ore district in South Sulawesi Province of Indonesia lies on the circum-Pacific volcanic island arc.It is one of the largest and high quality polymetallic deposits discovered in recent years, with mainly lead-zinc and occasionally copper-silver-gold resources.Firstly,the authors used spontaneous potential (SP) and induced polarization (IP) method to sieve superficial anomalies,and employed the transient electromagnetic section to evaluate the attitude and distribution of ore-related anomalies.The conclusion is that the major SP and IP anomalies lie at Bilolo,Rumanga and Medila and might be caused by concealed NW-trending gently-oblique tabular orebodies.Secondly,the authors compared the Sangkaropi deposit and the Kuroko-type deposit in Japan,and reached the conclusion that the Sangkaropi ore deposit was caused by Kuroko-type mineralization and geological structure,and hence has the characteristics of both Kuroko-type deposit and linear mineralization.Finally,the authors made a suggestion for prospecting on the basis of geophysical anomaly,Kuroko-type deposit characteristics and geological structure.The results obtained by the authors are helpful in the search for similar deposits in peripheral areas.
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