Mechanism of Transportation and Precipitation of Mineralization Elements in the Huize Super-Large Pb-Zn Deposit, Yunnan Province, China

详细信息   

• 责任者：Luo Dafeng (Chihong Zinc & Germanium Co. ; Qujing 655000 ; China) ; Huang Zhilong
• 刊名：Acta Mineralogica Sinica
• 出版年：2012
• 卷期：32(2)
• 关键词：铅锌矿床 ; lead-zinc deposit ; 元素迁移 ; migration of elements ; 云南 ; Yunnan Province
• 页码：p.288-293
• 图表：6 illus., 2 tables, 29 refs.
• 分类号：1001
• issnNo：ISSN1000-4734
• isbnNo：CN52-1045/P

摘要

///The Huize Pb-Zn deposit in Yunnan Province, China, is the only super-large Pb-Zn deposit ascertained in Sichuan-Yunnan-Guizhou Pb-Zn-Ag polymetallic ore concentration area on the southwestern margin of the Yangtze Block. In this paper, the authors discusses the mechanism of transportation and precipitation of the ore-forming fluid by using thermodynamics combining with previous studies on geological characteristics and source and characteristics of ore-forming fluids of Huize Pb-Zn deposit. At low temperatures (150~250 ℃), Zn transported mainly as hydrosulfide complex and only a few as chloride complex. While, Pb transported mainly as chloride complex and a few as hydrosulfide complex. At middle and high temperatures (300~400 ℃), Pb and Zn both transported mainly as chloride complex. The main precipitation mechanism of mineralization elements is fluid mixing which causes the decrease of temperature of ore-forming fluid, concentration of reduced sulfur and Cl^-, oxygen fugacity and the increase of pH.