A study of deep metallogenic prediction and metallogenic mechanism of the Dachang deposit in Guangxi
LIU Cheng-Gong1,2, JING Jian-En1,3(), JIN Sheng1,3, WEI Wen-Bo1,3
1. School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, China 2. China National Petroleum Pipeline Engineering Corporation, Langfang 065000, China 3. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China
As one of the large tin-polymetallic deposits in the world, the Dachang deposit has complicated metallogenic mechanism and rich hidden mineral resources. In order to detect the distribution and study mineralization mechanism of the concealed deposits around the cage and cover rock in the Dachang ore district, the authors finely processed the audio magnetoelectromagnetic data covering the Dachang ore district, and obtained a two-dimensional electrical structure model within the depth of 3 km. According to the results of resistivity model, the location of concealed granite and orebody was determined. Granite is characterized by high resistance and is buried at a depth of about 1.5 km, with the formation of ridge uplift along the fault structure. The low-resistivity orebody is located in the middle Devonian strata at the top of granite, so it is inferred that the orebody was developed from the granite at the bottom, which indicates that granite has an obvious ore-controlling effect. According to the zonal characteristics of copper in the near place and tin in the distant place as well as anomalies of metallic elements in the Dachang ore district, it is most possible to find skarn type Zn-Cu deposits and Sb-W deposits. The research shows that, in the late Cretaceous period, the magmatic hydrothermal fluids of the middle and lower crust together with a small amount of upper mantle rose to the shallow Devonian strata of the crust along the basement fault in the NW direction, and then formed mineralization with surrounding rocks through crystallization differentiation.
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LIU Cheng-Gong, JING Jian-En, JIN Sheng, WEI Wen-Bo. A study of deep metallogenic prediction and metallogenic mechanism of the Dachang deposit in Guangxi. Geophysical and Geochemical Exploration, 2021, 45(2): 337-345.
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