ZHAO Zheng1, HU Yu-si2, TAN Hua3, XU Lei1, REN Hou-zhou1, LU Mao-da1
(1. No. 104 Geological Team, Bureau of Geology and Mineral Exploration and Development of Guizhou Province, Duyun 558000, China;
2. Stake Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;
3. Bureau of Geology and Mineral Exploration and Development of Guizhou Province, Guiyang 550004, China)
Abstract: The NW Guizhou Pb-Zn metallogenic district is one of the most important Pb-Zn resource bases in Guizhou Province, with good ore prospecting prospects. The Pb-Zn deposits in this area mainly occurred in the Cambrian-Permian strata. The Pb-Zn deposits hosted in Sinian strata are limitedly reported. They are mainly distributed in the Wuzhishan and Shuidong areas in the junction of Puding and Zhijin counties. The relevant geological and geochemical research on this type of Pb-Zn deposits is in a very low level. Whether this type of deposit has good prospecting prospects or not in this area is a scientific problem worth to be further studied. Taking the Pb-Zn deposits in the Shuidong area in Nayong County as examples, we have summarized the geological characteristics of these deposits and discussed their ore-forming regularities in this paper. The results show that the Pb-Zn deposits in this area have obvious reworking characteristics, with the most important ore-controlling factors of the NE- and NW-trending faults, simple association of minerals including mainly sphalerite, galena, and pyrite, and have similar geological and geochemical characteristics to the Pb-Zn deposits in the Sichuan-Yunnan-Guizhou metallogenic district. In addition, the geological tectonic setting, sedimentary environment, and high water system domain in Simian Dengying epoch, ancient faults, microbes, and later structures also controlled the occurrence of the Pb-Zn deposits (mineral occurrences) hosted in the Sinian strata. This achievement not only has provided a geological basis for understanding the Pb-Zn mineralization in the Sinian strata in northwest Guizhou, but also has widened the thought for future geological exploration of Pb-Zn deposits in this area.
Keywords: Pb-Zn deposit; geological characteristics of deposit; metallogenic regularity; ore-controlling factor; Sinian strata; the Shuidong area in Nayong County, Guizhou
