ZHANG Xin-yu1, WANG Xin-fu1, LI Bo1*, QIU Wen-long2, XIANG Zuo-peng1, YUE Yan1, YANG Si-xin3, WAN Bang-ming3, YANG De-chuan4
(1. Faculty of Land and Resource Engineering, Kunming University of Science and Technology / Southwest Institute of Geological Survey Centre for Nonferrous Metals Resources, Kunming 650093, China;
2. Faculty of Geography and Land Engineering, Yuxi Normal University, Yuxi 653100, China;
3. Xinlong Mining Co., Ltd., Weining 553200, China;
4. No. 113 Geological Team, Bureau of Geology and Mineral Exploration and Development of Guizhou Province, Liupanshui 553000, China)
Abstract: The Liangshuigou Pb-Zn deposit, located in the eastern part of the Sichuan-Yunnan-Guizhou Pb-Zn mineralization domain, is one of the lead-zinc deposits in the north-western Guizhou metallogenic concentration area. The trace elements compositions of pyrites and sphalerites from this deposit have been tested by using electron probe microanalysis (EPMA) in this paper. The results show that there are two phases of pyrites in the Liangshuigou Pb-Zn deposit. Pyrite-I is of sedimentary origin, and is obviously reworked by the superposition of late stage hydrothermal fluid. Pyrite-II is of hydrothermal origin. Both kinds of pyrites are rich in Pb, Zn, Co, Ni, As, and Mo, but poor in trace elements such as Au, Ag, and Sb. The sphalerite is characterized with the enriched trace elements such as Cu, Fe, Cd, Pb, and Ga. Trace elements such as Co, Ni, Mo, Pb, and As, could occur in sulfides in forms of isomorphic replacement or their mineral inclusions. The trace element characteristics of sulfides show that they were mainly formed in the metallogenic environment of medium and low temperatures, with characteristics of sedimentation-reworking genesis. Based on the geological characteristics of the deposit and the regional metallogenic geological background, it is considered that the Liangshuigou Pb-Zn deposit belongs to a sedimentary-reworked Pb-Zn deposit.
Keywords: Sulfides; electron probe; deposit genesis; Liangshuigou Pb-Zn deposit; Northwestern Guizhou
ACTA MINERALOGICA SINICA Vol. 40, No.4, 2020, page 418-429
