Abstract:

 Hulu magmatic Cu-Ni deposit in Hami of Xinjiang is located at the eastern Tudun-Huangshan-Jingerquan-Tulaergen mafic-ultramafic complex suite. The deposit with an outcrop of Upper Carboniferous Wutongyaozi formation is a typical mafic-ultramafic sulfide deposit. It is very helpful for the deposit exploration in the whole complex suite to study and summarize the characteristics of geophysical anomalies. According to the results from the 1∶5,000 ground magnetic survey and 1∶5,000 transient electromagnetic sounding profiling that we have obtained recently, and the IP that other researchers have already studied, it is revealed that the deposit was in the place with anomalies of high magnetism, high polarizability and low resistivity. The values of ΔT, ηa and ρa were above 500 nT, above 6% and below 200 Ω·m,respectively. These data were significant information for finding potential prospecting areas. Based on the drilling results, this paper also discussed the genesis of the anomalies and the relation between anomalies and deposit in the threedimensional space. Finally, it was found that much lower resistivity anomalies were not definitely caused by reactions of the deposit.

Key words: geophysical prospecting;transient electromagnetic method, CuNi deposit;Hulu magmatic rock body, Hami, Xinjiang