ZENG Dao-guo1, CAI Guo-Sheng1*, DU Lin1, YE Lin2
(1. Institute of Geology and Mineral Resource Exploration, Non-Ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou，Guiyang 550005, China;
2. State key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China)
Abstract: The northwestern Guizhou is an important base of lead and zinc resources in Guizhou Province. In recent years, an important breakthrough for prospecting mineral resources in the area have been achieved. Especially, the first supper-large sized Pb-Zn deposit (Zhugongtang) in Guizhou Province was found. The Shuichaobao－Baimachang area is a typical representative of Pb-Zn metallogenic belts in the northwestern Guizhou. The comprehensively comparative study of geological characteristics of Pb-Zn deposits show that those Pb-Zn deposits have similar geological features, such as a simple assemblage characterized with low temperature minerals, the ore minerals of major sphalerite with minor galena and pyrite, mainly the Zn mineralization, and the weak wall rock alteration. It is believed that the Yadu-Mangdong thrust fault is the most important ore- controlling structure in the area, as different sized deposits are distributed along the fault zone in groups, and their Pb-Zn orebodies are mainly hosted in the fault and its footwall in which orebodies are favorably hosted in the space about 0－200 m to the fault, especially the locations where the dipping angle of the fault zone was changed from steep to flat, and width of the fault zone was changed from narrow to wide, and the secondary faults and folds was strongly developed. With the summary of geological mineral exploration results in recent years, it is believed that there is a good potential for further prospecting Pb-Zn resources in the Yadu－Mangdong fracture zone. It is suggested the geological exploration should focus on spaces where are in footwall of the Yadu－Mangdong thrust fault within distances of 0－400 m away from the fault and in the depth surrounding areas of the known orebodies of deposits. Although carbonates of the Permian qixia and Maokou formations are important ore-hosting strata in the area, characteristics of the ore hosted in multi-layers of strata should not be ignored in future geological exploration of Pb-Zn resources in the area. Furthermore, geological features of the Liangyan－Wopeng block of the study area are similar to those of the Zhugongtan super-large deposit, showing that due to the good potential for prospecting Pb-Zn resources, it could be a favorable prospecting target for discovering possible medium-large scale Pb-Zn deposit.
Keywords: lead-zinc deposit; the Yadu－Mangdong fault; spatial relationship; prospecting target; the northwestern Guizhou
ACTA MINERALOGICA SINICA Vol. 40, No.4, 2020, page 475-482
