HE Zhi-wei1, 2, LI Ze-qin2, CHEN Jun3, ZHANG Jia-wei4, HUANG Zhi-long3*
(1. Southwest Energy Mining Group Co., LTD, Guiyang 550000, China;
2. School of Earth Science, Chengdu University of Technology, Chengdu 610000, China;
3. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;
4. Guizhou Geological Survey, Bureau of Geology and Mineral Exploration and Development of Guizhou Province, Guiyang 550081, China)
Abstract: With the deep integration of metallogenic theories and geological exploration of lead-zinc polymetallic deposits in the northwest Guizhou, several large and super-large lead-zinc deposits such as the Nayongzhi and Zhugongtang have been discovered subsequently in the area. The discovery of those deposits resulted in the most important breakthrough in the prospecting history of lead-zinc polymetallic deposits in the northwest Guizhou and revealed the great prospecting potential of Pb-Zn resources in the area. Metallogenic lithologic assemblages and structural ore-controlling styles are not only the basic factors for the emplaced lead-zinc polymetallic orebodies, but also the fundamental scientific issues for the study of ore deposits. They can be used as direct evidences for mineral Pb-Zn resources prediction. In this paper, we have deeply analyzed the ore-controlling lithologic assemblages and structural styles of seven typical lead-zinc deposits in the northwest Guizhou, determined two kinds of ore-controlling lithologic assemblages (carbonaceous shale + carbonate + carbonaceous shale; carbonaceous shale + carbonaceous argillaceous carbonate) and four kinds of structural ore-controlling styles ("extensional fault-anticline", "faulting composite space", "longitudinal pinnate joints of the reverse fault" and "parallel secondary fault"), summarized the metallogenic process of "the fluid-structure combined input and the lithologic assemblage entrapment", deeply understand the emplacement mechanism of lead-zinc polymetallic orebodies, and finally improved the metallogenic model of lead-zinc polymetallic deposits. This paper has provided a theoretical basis for predicting and prospecting Pb-Zn resources in depth in this area.
Keywords: lead-zinc polymetallic deposit; lithologic assemblage; structural style; Northwest Guizhou Province
ACTA MINERALOGICA SINICA Vol. 40, No.4, 2020, page 367-375
