Mantle-Derived Ore-Forming Fluids of the Fenghuangshan Cu Deposit, Evidences form Microthermometric and Isotopic Studies

详细信息   

• 责任者：Qu Hongying (Key Laboratory of Metallogeny and Mineral Assessment ; MLR ; Institute of Mineral Resources ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Pei Rongfu
• 刊名：Geological Review
• 出版年：2011
• 卷期：57(1)
• 关键词：铜矿 ; copper ores ; 成矿流体 ; ore-forming fluids ; 安徽 ; Anhui Province
• 页码：p.50-62
• 图表：9 illus., 3 tables, 29 refs.
• 分类号：1001
• issnNo：ISSN0371-5736
• isbnNo：CN11-1952/P

摘要

 The Fenghuangshan is a large Cu skarn deposit in the low-middle Yangtze metallogenic province. Based on microthermometric and isotopic (C, H, O, S, and Pb) studies, the authors discuss ore-forming fluids evolution and metal origin (s) of the Fenghuangshan Cu deposit. H₂O-CO₂ type fluid inclusions, which can be classified into liquid-rich, vapor-rich and daughter crystal-bearing subtypes, are ubiquitous in diopside, garnet, quartz and calcite. Laser Raman spectroscopic analysis indicates that liquid phase of fluid inclusions is H₂O, and vapor phase is dominant by CO₂, N₂ and CH₄. Homogenization temperature (Th) and salinity of fluid inclusions suggest three-stage history of ore-forming fluids, reflecting an evolution process from high-temperature and salinity at mineralization stage to low-temperature and salinity at post mineralization stage. Temperature decreasing and fluids boiling may be responsible for precipitation of large quantity of metals.