Tectonic Features of Deposition and Faults of Danaopo Mining Area in Western Hunan and the Controlling Effect on Pb-Zn Mineralization

In order to clarify the tectonic features of deposition and faults in Danaopo mining area and the controlling effect on the Pb-Zn mineralization, this paper identified the reef deposits of this area and divided the main fault systems into three fault systems:Huayuan-Zhangjiajie fault zone (F₁ main fault), Abilinchang-Qingshuitang fault zone (F₂ main fault) and Kaizhipu-Liangshuijing fault zone (F3 main fault) Layer). The fault systems are further divided into three types based on the relationship between the stages of fault activity and mineralization:regional inherited fault, metallogenic fault and post metallogenic fault.The regional inherited fault is mainly Huayuan-Zhangjiajie fault; the fault in the metallogenic period is mainly F₂, F₁₀₈ and F_2-1 faults in Abilinchang-Qingshuitang. The distribution of the post metallogenic fault, which develops in the whole area, is more complicated because of the post metallogenic tectonic stress. Based on the relationship between the sedimentary environment, the fracture structure and the mineralization of Qingxudong Formation in Danaopo mining area, it is considered that the main metallogenic model is that when the deep ore fluid moves upward in the metallogenic period by the algal limestone through the regional inherited faults,the metallogenic fluid in the ideal space undergoes metasomatism and deposition, forming the mineralization. The authors thus summarize the metallogenic law of lead-zinc deposits in Danaopo mining area and believe that the regional inherited large fault (Huayuan-Zhangjiajie fault zone) controls the extension and distribution of the whole ore field. The joints and the secondary faults in the metallogenic period is the concentrating area of high-grade ore body.