WEI Chen1,2, YE Lin1*, HUANG Zhi-long1, HU Yu-si1,2, WANG Hao-yu1,2, ZHANG Jia-wei3
(1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Guizhou Geological Survey, Bureau of Geology and Mineral Exploration and Development of Guizhou Province, Guiyang 550081, China)
Abstract: The northwestern Guizhou metallogenic zone is one of the important parts of the Sichuan-Yunnan-Guizhou (SYG) metallgenic province, though none of the large sized Pb-Zn deposit has been discovered before 2010. Recently, a breakthrough of the Pb-Zn exploration has been made in the Wuzhishan district by Guizhou geologists. Several large and/or median sized Pb-Zn deposits have been discovered in the area with over 2.50 Mt of newly increased Pb-Zn resources. In order to better understand the Pb-Zn mineralization in the Wuzhishan district and to provide a theoretical basis for ore exploration in the Wushishan and adjacent areas, in this paper, we have systematically reviewed recent advances in studies of Pb-Zn deposits in the Wuzhishan district made a comparison between Pb-Zn deposits in the the SYG and those in the Western Hunan-Eastern Guizhou (WHEG) district, China in terms of geology, geochemistry, and geochronlogy, and discussed the attribution of the Wuzhishan Pb-Zn metallogenic belt. Comprehensively geological and geochemical studies suggest that the ore-forming metals could be mainly derived from the metamorphic basement with a small contribution from host rocks due to the fluid-rock interaction. The ore-forming fluids could be mainly sourced from the low temperature medium-high salinity brines mixed with a small amount of formation water. All these Pb-Zn deposits should be ascribed to the MVT-type deposit. Additionally, geochronological dataset has revealed that the Pb-Zn mineralization of various deposits in the Wuzhishan, formed at 458.2±2.9 Ma, may be associated with the Wuyi-Yunkai intracontinental orogenic event, indicating the possible extention of the comtemporary Pb-Zn mineralization in the WHEG area. By systematically geological and geochemical comparison, it is found that the characteristics of Pb-Zn deposits in the Wuzhishan orefield are similar to those of the typical deposits in the WHEG Pb-Zn metallogenic belt, but are obviously different to those of the typical Pb-Zn deposits in the SYG triangle. Therefore, the Wuzhishan orefield is temporarily assigned to the WHEG me tallogenic belt.
Keywords: The Sichuan-Yunnan-Guizhou district; Pb-Zn mineralization; sources of metals and ore-forming fluid; age of mineralization; ore genesis
ACTA MINERALOGICA SINICA Vol. 40, No.4, 2020, page 394-403
