The application of the wide field electromagnetic method to the Shanggong gold ore concentration area
LIU Yao-Wen1,2(), JIANG Yong-Fang3, FENG Shao-Ping1,2(), YOU Wen-Bin3, ZHANG Su-Kun1,2, CHANG Jia-Yi1,2, LI Li1,2, ZHANG Yi-Jing1,2
1.First Survey Institute of Geology and Mineral Resources, Henan Bureau of Geo-exploration and Mineral Development,Luoyang 471023,China 2.Gold and Silver Polymetallic Metallogenic Series and Deep Prediction Key Laboratory in Henan Province,Luoyang 471023,China 3.Hunan Geosun High Tech Co.,Ltd,Changsha 410208,China
The Shanggong gold ore concentration area is located in Xiong'ershan area of western Henan Province, and lies on the south margin of North China block. Combined with regional geological and geophysical data, the authors used the wide-field electromagnetic method to measure the Shanggong ore concentration area, and systematically processed and quantitatively retrieved the wide-field electromagnetic data. According to the inversion profile, the electrical characteristics of middle and low apparent resistivity in this area were inferred to be gneisses of Shibangou Formation of Neo-Archean Taihua Group, the high apparent resistivity shows andesites of Xushan Formation of middle Proterozoic Xiong’er Group, and middle and high apparent resistivity shows intrusions of Proterozoic diorite. According to the apparent resistivity pseudoplane map, resultant inversion profile and related geological data, eight fault tectonic belts and two tectonic alteration belts were delineated, among which F1 and F5 tectonic fracture belts, with large extension length, had good deep ore-prospecting space and potential, and two favorable ore-forming areas were delineated in the depth.
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