Abstract:There are three large-medium sized deposits in Qibaoshan area, including Diaoyutai pyrite deposit, Jinxiantou gold-copper deposit and Qibaoshan polymetallic deposit. Many studies have been carried out on these deposits, but study on ore-controlling structures is less and lack of systematic research. In this paper,ore-bearing structures in this area have been studied, and structural types have been discussed. Structural types can be divided into "X" conjugate structure type, cryptoexplosive breccia cylinder structure type, interbedded fracture zone structure type and interbedded tuff structure type. Deposits are controlled by Yishu fault zone and its secondary structures. The ore-forming sequence is pyrite tuff type (polymetallic ore) —gold-copper deposit—Hongshigang, Xingshanyu (altered rock type, "X" conjugate ore-controlling type)—Hongshigang, Xingshanyu (vein type, "X" conjugate ore-controlling type) and interlayer fracture belt type. It is considered that three deposits are the products of different metallogenic stages and different temperatures, related to the volcanic mechanism in the area and belong to the same metallogenic series. All deposits are dip to southeast, which are influenced by Yishu fault. Based on the characteristics of mineralization alteration and aeromagnetic anomaly of the deposit, it is pointed out that medium-low temperature polymetallic deposit at southeast of the mining area and medium-high temperature gold-copper deposit should be searched in deep of the cryptoexplosive breccia cylinder .
