LIU Ming-min1,2,3, XIE Xing-you1,3*, SU Te1,3, PAN Wen1,3, WANG Jia-jun1,3, FENG Kai-you1,3, LIU Ling4, SHI Rui4, RAO Hong-juan4, LUO Bang-liang4
(1. Geology Team 103, Bureau of Geology and Mineral Exploration and Development Guizhou Province, Tongren 554300, China;
2. School of Earth Resources, China University of Geosciences, Wuhan 430074, China;
3. Engineering Technology Innovation Center of Mineral Resources Explorations in Bedrock Zones, Ministry of Natural Resources, Guiyang 550081, China;
4. Geology Team 101, Bureau of Geology and Mineral Exploration and Development Guizhou Province, Kaili 556000, China)
Abstract: The Dahebian giant SEDEX-type barite deposit in Tianzhu County, Guizhou Province, is located in the Xuefeng－Wuling thrust fold belt of the Western Hunan－Southeastern Guizhou foreland uplift. The batite orebody is hosted in the siliceous clastic rock stratum in the middle and upper parts of the Liuchapo Formation. The Pingdi fault (F1) is the northwest boundary of the barite deposit. In order to find out the damage and preservation situations of the barite orebody caused by the F1, and to further guide the deployment of ore-prospecting and exploration projects in the deep part and periphery of the deposit, in this paper, through the field geological survey and the audio-frequency magnetotelluric sounding (AMT) survey, and combined with previous exploration results, we have systematically studied the F1 in the Dahebian giant barite deposit for identifying its nature and exploring its effect on transformation of the orebody. The results show that the F1 is a post-ore fault with the thrusting-dextral translation property. It had cutt off the ore-bearing rock series and barite orebody, with vertical faulting distances varying from 700m to 800m in the Guilushan oreblock. From the Yongfa area (Borehole ZK1205) to the F1 footwall boundary, there is still a thick barite orebody in ore-bearing rock series of the Liuchapo Formation, which is of great ore-prospecting potential in this area.
Keywords: barite; Tianzhu; post-ore fault; transformation effect; Dahebian
