项目名称: 陕西金龙山卡林型金矿床中黄铁矿的离子探针微区原位硫同位素分析
项目编号: No.41303008
项目类型: 青年科学基金项目
立项/批准年度: 2014
项目学科: 天文学、地球科学
项目作者: 陈蕾
作者单位: 中国科学院地质与地球物理研究所
项目金额: 25万元
中文摘要: 成矿物质来源是卡林型金矿床成因研究中长期争论的焦点之一,利用离子探针进行微区原位硫同位素分析可为解决这一争论提供直接的证据,但该方法在我国至今尚未建立。本项目以西秦岭金龙山卡林型金矿床为研究对象,在详细的野外地质观察基础上,利用离子探针对不同期次的黄铁矿进行微区原位的硫同位素分析,查明该矿床金及其他伴生金属元素的分布特征,弄清成矿物质来源,为阐明金龙山卡林型金矿的矿床成因提供重要的理论依据。离子探针微区原位的硫同位素分析方法和标准样品的建立,将为我国卡林型金矿的研究提供新的技术方法。
中文关键词: 黄铁矿;离子探针;硫同位素;;赋存在沉积岩中的金矿床;秦岭造山带
英文摘要: The source of metallogenic material is controversial,as is the nature of the hydrothermal systems that concentrated.The ion microprobe is a technique that provides sulfur stable isotope ratio measurement with high spatial resolution and precision approaching that of conventional isotope methods.However, in situ sulfur isotope analysis method hasn't been built in China.This proposed research involves detail field observations and intensive investigation on the mineralogy, petrography, geochemistry, and in situ S isotope geochemistry to unravel the origin of Jinlongshan Carlin-type gold deposit in western Qinling Orogen. The Jinlongshan deposit preserves textural, structural and geochemical evidece for multiple generations of Au enrichment and pyrite growth.Investigating the S isotopc systematics of the different pyrite generations will provide the indication of source of sulfur and ore fluids of the Jinlongshan deposit.This new method and standards will provide the new technique for understanding the source of sulfur and metals in Carlin-type gold deposits.
英文关键词: pyrite;SIMS;sulfur isotopes;sediment-hosted gold deposit;Qinling orogen