Research on structural characteristics and mineral prediction of the Luoning area based on the characteristics of gravitational and magnetic fields
ZHANG Lei1,2,3,4(), WANG Wan-Yin2,3,4, WANG Xiao-Bo1, LI Wen2,3,4, ZHANG Xue-Li1, SONG Hao1,2,3,4, YANG Min2,3,4, AN Li-ming1()
1. Mineral Resources Exploration Center, Bureau of Geo-exploration & Mineral Development, Zhengzhou 450053, China 2. Institute of Gravity and Magnetic Technology, Chang'an University, Xi'an 710054, China 3. School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, China 4. National Engineering Research Center of Offshore Oil and Gas Exploration, Beijing 100028, China
The Luoning area is located at the junction of the Xiaoshan Uplift and the Luoning Basin and falls into the Quaternary shallow overburden area. Large-scale silver-lead-zinc deposits such as Laoliwan and Zhonghe have been discovered in this area, and their formation is closely related to the acidic plutons controlled by fault structures. This study investigated the distribution of fault structures and acidic plutons based on the processing of 1:50000 gravity and magnetic data using the minimum curvature potential field separation technique, the normalized vertical derivative of the total horizontal derivative (NVDR-THDR) technique, the correlation analysis method, and the three-dimensional physical property inversion. The study results are as follows: (1) The Luoning area is affected by the NW-, NE-, and EW-trending structures; (2) Centering on the Laoliwan area, multiple sets of faults present a ring-shaped distribution with a radius of 6.5 km; (3) Multiple concealed plutons were discovered, and the boundaries of Laoliwan and Zhonghe plutons were re-determined; (4) The distribution of granites is controlled by ring-shaped structures and have a burial depth of about 3 km; (4) The ring-shaped structures are well correlated with magnetic anomaly gradient zones, where ores were found in many boreholes. Therefore, it is of great significance to carry out prospecting studies in these zones.
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ZHANG Lei, WANG Wan-Yin, WANG Xiao-Bo, LI Wen, ZHANG Xue-Li, SONG Hao, YANG Min, AN Li-ming. Research on structural characteristics and mineral prediction of the Luoning area based on the characteristics of gravitational and magnetic fields. Geophysical and Geochemical Exploration, 2023, 47(3): 608-617.
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