ZHANG Shi-kui¹, MIAO Ying-li^{1, 2}, GUO Yue-jin¹

(1. Yunnan Hualian Mineral Resource Exploration Co. Ltd., Qujing 655000, China;
2. No. 317 Geological Team, Yunnan Nonferrous Metals Geological Bureau, Qujing 655000, China)

Abstract: As one of the largest Sn poly-metals ore deposit in China, geologic exploration on Dulong mine area is very important for continual development of mine companies. The carbonate-hosted Pb-Zn mineralization, a new type mineralization, was recently discovered by geological exploring south-western Dulong ore area, which is hosted within the marble of the Middle Cambrian Tianpeng Formation, and the ore-controlling factors are dominated by structure with weak wall-rock alteration (lack of skarn). Its mineral assemblage and wall-rock alteration are obviously different from those of skarn type Sn-Zn ore body in Dulong ore area. Being higher grade of mineralization, carbonate type Pb-Zn mineralization is worthy geological exploration in detail, although its mineralize scale is relatively lower than that of skarn type Zn-Sn ore bodies. It is suggested that both vein type Pb-Zn mineralization and skarn Sn-Zn mineralization are connected with to the late Yanshanian concealed granite in ore area, and the carbonate stratum above the raised concealed granite is benefit location for ore-forming. With the discovery of vein type Pb-Zn mineralization, not only the idea of ore exploration is developed, but also the new geological evidence is provided for understanding the mineralization mechanism.

Key words: carbonate-hosted; Pb-Zn ore body; Sn poly-metals deposit; Lazizhai ore block; Dulong