The application of gravity and magnetic techniques to the prospecting for the Tuerkubantao copper-nickel ore district
Wang Wanyin1, Feng Xuliang1, Gao Lingju1, Wang Pengfei1,2, Liu Bin1,3
1. Institute of Gravity and Magnetic Technology, College of Geology Engineering and Geomatics, Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Chang'an University, Xi'an 710054, China;
2. Xi'an Research Institute of China Coal Technology & Engineering Group Corp, Xi'an 710017, China;
3. Jiuquan Iron & Steel Group, Jiayuguan 735100, China
On the basis of observed gravity and magnetic data combined with geological information and borehole data obtained in the Tuerkubantao Cu-Ni ore district,the authors determined high gravity anomalies along with high magnetic anomalies as symbols to recognize ultrabasic rocks and basic rocks in this area. The authors used the correlation analytical method to analyze gravity and magnetic anomalies and,through computation of the correlation coefficient of gravity and magnetic anomalies,found that they are obviously of consanguinity. The authors deduced five faults with the edge recognition technology based on the normalized vertical derivative of the total horizontal derivative(NVDT_THDR) for potential field data. It is shown that the NWW—SEE trending faults were formed earlier and they are in accord with regional structure trend. The NE—SW trending faults were formed later and disconnected the NWW—SEE trending faults. 18 ultrabasic rocks and basic rocks were recognized based on the second order vertical derivative of Bouguer gravity anomalies,the first order vertical derivative of magnetic anomalies reduced to the pole and the result of correlation analysis. Then a discussion was made on the plane distribution characteristics and the size of these rocks. Their vertical distribution characteristics and size were also studied by using the gravity and magnetic man-computer interactive joint inversion method. The results indicate that the sizes of the ultrabasic rocks and basic rocks are not big. In consideration of both the characteristics of the faults and the rocks,the authors hold that distribution of the rocks is controlled by faults. The ultrabasic rocks and basic rocks are mainly distributed in the area surrounded by F1 fault,F4 fault and F5 fault. The distribution of the rocks can be divided into three stripes which coincide with the NWW—SEE trending faults. It is thought that the rocks intruded along the NWW—SEE trending faults and were constrained by NE—SW trending faults.
王万银, 冯旭亮, 高玲举, 王鹏飞, 刘斌. 重磁方法在吐尔库班套铜镍矿区勘查中的应用[J]. 物探与化探, 2014, (3): 423-429.
Wang Wanyin, Feng Xuliang, Gao Lingju, Wang Pengfei, Liu Bin. The application of gravity and magnetic techniques to the prospecting for the Tuerkubantao copper-nickel ore district. Geophysical and Geochemical Exploration, 2014, (3): 423-429.
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