XU Yang-dong1, TIAN Ya-jiang1, ZHENG Lu-lin2*, YIN Nu-xun1, YU Jie1, TANG Yong-yong3
(1. Guizhou Institute of Geophysical and Geochemical Prospecing, Guiyang 550018, China;
2. College of Mining, Guizhou University, Guiyang 550025, China;
3. State Key Laboratory of Ore Deposit Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China)
Abstract: The Laodongzhai Pb-Zn deposit is a representative medium-sized one firstly discovered in silty dolostone of the Sinian Doushantuo Formation in SE Guizhou. Due to the relatively low degree of relevant geological and geochemical researches, in this paper, we have studied geochemistry of trace elements in sphalerites and made comparison of REE geochemical characteristics of sphalerites, ore-hosted dolostones, and wallrocks. The results show that Cu, Ga, Cd, and Sb are enriched in various degrees in sulfides. The ores and wallrocks have LREE-enriched REE distribution patterns. Sphalerites in main ores have unobvious Ce anomalies (δCe=0.62－0.89). They have partly obvious negative Eu anomalies (δEu =0.45－0.86) and partly positive Eu anomalies (δEu=1.22－4.46). Combining with the deposit geological characteristics and the occurrence and distribution characteristics of barites, it is believed that the ore-forming process had experienced the transformation from oxidized to reduced environments.
Keywords: Laodongzhai Pb-Zn deposit; trace elements; REE; geochemical characteristics; ore-forming environment
ACTA MINERALOGICA SINICA Vol. 40, No.4, 2020, page 450-457
