• 责任者：Ma Yubo (Key Laboratory of Metallogeny and Mineral Assessment ; MLR ; Institute of Mineral Resources ; CAGS ; Beijing 100037 ; China) ; Du Xiaohui
• 刊名：Mineral Deposits
• 出版年：2013
• 卷期：32(6)
• 关键词：铅锌矿床 ; lead-zinc deposit ; 稀土元素 ; rare earths ; 辽宁 ; Liaoning Province
• 页码：p.1236-1248
• 图表：6 illus., 1 table, 34 refs.
• 分类号：1001
• issnNo：ISSN0258-7106
• isbnNo：CN11-1965/P

     The Qingchengzi ore field lies in Liao-Ji rift valley within eastern block of the North China Craton. The Zhenzigou Pb-Zn deposit is a main deposit among the medium and small sized Pb-Zn deposits in this area. In order to study the origin of the ore material, the corresponding surroundings and the geological significance of the stratiform and veined Pb-Zn ore deposit, the authors analyzed REE of the stratiform Pb-Zn ore and its host rocks, the veined Pb-Zn ore and its host rocks and the veined rocks which penetrate the veined ore body in the Qingchengzi Pb-Zn deposit by using ICP-MS technology. The results show that all samples are characterized by LREE enrichment and differentiation. The REE content of stratiform Pb-Zn ore and its host rocks shows positive Eu and weak negative Ce anomalies in the chondrite-normalized REE patterns of the ores, indicating that the ore-forming hydrothermal fluids were mixed with deep hydrothermal fluids and seawater, which had high temperature and were relatively reductive. Veined Pb-Zn ores are similar to stratiform Pb-Zn ores in chondrite-normalized REE patterns, suggesting that these two ore types had the same ore-forming material sources and surroundings. However, the REE content of most veined Pb-Zn ores shows weaker Eu and Ce anomalies than that of stratiform Pb-Zn ores, with only a few samples showing weak Ce positive anomalies in the chondrite-normalized REE patterns. The veined rocks show apparent Eu positive and Ce negative anomalies in the chondrite-normalized REE patterns, which may explain the differences between these two types of Pb-Zn ores. Besides, the total REE amount of the veined rocks and veined Pb-Zn ores is somewhat larger than that of stratiform Pb-Zn ores. The above REE characteristics indicate that stratiform and veined Pb-Zn ores had the same ore-forming materials and surroundings, whereas the veined Pb-Zn ores and their host rocks were subjected to the magmatic intrusion and superimposed reformation which resulted in the formation of Eu positive anomalies and partial weak Ce negative anomalies as well as the increase of total REE amount.