Citation: | CHEN Pengyuan, WU Peng, HAN Runsheng, ZHOU Mengxiang, LI Maoping, ZHAO Dong, JIANG Longyan. 2020. Model of rock and ore controlling structures in the Baoshan Cu-Pb-Zn polymetallic deposit, southern Hunan province, China. Journal of Geomechanics, 26(3): 405-418. doi: 10.12090/j.issn.1006-6616.2020.26.03.035 |
The Baoshan Cu-Pb-Zn polymetallic deposit, located in the overlapped part of the Nanling EW-trending tectonic belt and the Leiyang-Linwu SN-trending tectonic belt, is a typical large and super-large mineral deposit in this area. The deposit and ore-bodies are spatially closely related to the early Yanshanian granodiorite porphyry and obviously controlled by the structure. Based on precise measurement of the large-scale structural sections, this paper analyzes the structural types and their main characteristics, and summarizes the rules of structural control on rock and ore. The results show that the SK-type Cu-Mo ore-bodies are mainly controlled by NE-NEE-trending folds. The hydrothermal vein-type Pb-Zn-Ag ore-bodies are mainly controlled by the interlayer faults of fold flanks and the NE-trending compression-torsion faults. The direction of the max principal stress of the tectonic stress field experienced the transformation from near SN-trending before mineralization to near EW-trending during mineralization to NE-SW-trending after mineralization. The NE-NEE-trending compression-torsion faults are the main ore guiding structures, and the NWW-trending compression-tension faults are the main rock control structures. The structures not only control the distribution of ore-forming bodies, but also control the change of ore-forming types. On this basis the model of rock and ore controlling structures is established, indicating the deep NW-trending of the known ore-bodies is the favorable prospecting area. This study provides favorable evidence for ore-prospecting work at depth, and has reference significance for the suggesting of prospecting plan and deep exploration of the Pingbao ore field.
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Geological map of the Baoshan Cu-Pb-Zn polymetallic deposit
Schematic diagram of the comprehensive section of the Baoshan Cu-Pb-Zn polymetallic deposit (The position of the section is shown in Fig. 1, modified after Yin, 1998)
Geological plan of the Level 110 section in northern district of the Baoshan Cu-Pb-Zn polymetallic deposit
Tectonic section of Line 173 in the Level 110 section of the Baoshan Cu-Pb-Zn polymetallic deposit
Structure and orebody distribution of the Level 110 section in central-western district of the Baoshan Cu-Pb-Zn polymetallic deposit
Fracture photographs at the level 110 section Bp-96, Bp-99 points and the level 270 section B-46 point of the Baoshan Cu-Pb-Zn polymetallic deposit
Sketch of fault structural sections and mechanical properties at BH-5 and BH-8 points (Measuring points are shown in Fig. 3)
Sketch of the intrusion contact structural section and mechanical properties at the Bp-94 point (Measuring point is shown in Fig. 3)
Sketch of the intrusion contact structural section at the BH-25 point (Measuring point is shown in Fig. 3)
Sketch of intrusion contact structural section and mechanical properties at the BH-19 point (Measuring point is shown in Fig. 3)
Model of rock and ore controlling structures for the Baoshan Cu-Pb-Zn polymetallic deposit