CHEN Yun-ming1,2, LIU Zhi-chen1,2,3*, GUO Yu1,2, TANG Zi-chen1,2, CHEN Deng1,2, ZHANG Xiao-dong1,2, FAN Bo1,2, ZHONG Yue-li 1,2, GAO Jun-bo3,4
（1.The 102 Geological Team, Guizhou Bureau of Exploration and Development of Geology and Mineral Resources, Zunyi Guizhou 563003, China;
2. Technical Innovation Center of Mineral Resources Exploration Engineering in Bedrock Area of the Ministry of Natural Resources, Guiyang 550025, China;
3. College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China; 4. Key Laboratory of Karst Georesources and Environment, Ministry of Education, Guizhou University, Guiyang 550003 China)
Abstract: There are a large number of vein-type barite deposits in the Wuchuan area of the northern Guizhou. Some of those barite deposits in which fluorite generally occurred are worth to be studied. Five typical vein-type barite deposits, including Jiaoba, Tianba, Jinzhubao, Qingshui and Wenquan, in the Wuchuan area are taken as research objects of this paper. Through a comprehensive research on the geological characteristics, deposit genesis and key ore-controlling factors of these deposits, and a comparison with typical hydrothermal vein-type barite deposits in the southeastern Sichuan and southeastern Chongqing, the theoretical support for regional barite ore-prospecting has been provided. The basic geological survey shows that barite orebodies of those deposits mainly occurred in the bioclastic limestone and dolomite of the Lower Ordovician Honghuayuan and Tongzi formations in mainly vein-shaped form, and their occurrences and spatial distributions are strictly controlled by the NW-trending fault. The ores mainly have densely massive, banded, and mottled structures, and columnar blastoblastic, Mosaic, and dissolved metasomatic textures, with main ore minerals of barite and fluorite and gangue minerals of calcite and quartz. The results of this study show that the Cambrian black rock series in the basement of the study area could be the main source of barium supply, and the regional large hidden faults and their related secondary faults could be key factors causing the continuous activation of barium in the basement, Ba migration into and then Ba mineralization in cracks or fault fracture zones. Those barite deposits genetically belong to the low temperature hydrothermal barite deposit. In general, the hydrothermal barite deposits in the Wuchuan area have similar metallogenic geological background and ore-controlling mechanism with those in the southeastern Sichuan and southeastern Chongqing, and they could be products of the same geological event.
Key words: Barite deposit; Geological characteristics; Ore-controlling factors; Genesis of deposit; Wuchuan
