探索胶东金矿成矿物质来源的新证据—岩石学、矿物学约束

项目名称： 探索胶东金矿成矿物质来源的新证据—岩石学、矿物学约束

项目编号： No.41503038

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 天文学、地球科学

项目作者： 李大鹏

作者单位： 山东省地质科学研究院

项目金额： 21万元

中文摘要： 胶东金矿一直是国内外研究的热点。前人在构造、岩浆、流体或成矿机制方面取得了大量的研究成果，但金成矿物质来源问题却一直颇具争议，成为严重阻碍进一步研究的瓶颈，其根本问题在于各学说都缺乏相对直接的岩石学证据。金成矿过程中，必会在某个地质阶段发生金的富集，那么就应会留下相应的痕迹。为此，本次工作拟以玲珑和焦家金矿为研究对象，通过充分的野外地质调查，在已有样品基础上，寻找更多的可佐证金来源的富金岩体、岩石包体（/矿物巨晶）或者寄主于硅酸盐矿物中的载金矿物熔融包裹体等岩石学证据，进行详细的岩相学观察，并辅以高精度的矿物学、元素地球化学及元素微区分布图谱分析研究，约束金成矿物质来源、了解在岩浆过程中金的地球化学行为，并在此基础上讨论金元素在岩浆、流体系统中的演化特征和富集机制。通过开展这项探索性的研究工作，不仅能约束胶东地区金矿成矿物质来源问题，也可为国内外的金矿相关研究提供重要的资料和论据。

中文关键词： 成矿物质来源；岩石包体；熔融包裹体；胶东金矿

英文摘要： Jiaodong gold mineralization area（JGA for short）has received tremendous international attention in the research of gold mineralization. Previous researches have got quite a few study fruit on JGA, and in some extent have known the geological setting, the regional structure, the magmatism, the metallogenetic fluid and the metallogenic mechanism of the JGA. But the ore-forming material sources is often ambiguous and raises wide concerns. It is still a bottle neck limiting the development of the further research, due to the lacking of the direct petrological or mineralogical vidence. A great deal of evidence indicates that the Au elements-enriched event is the inevitable existing process in mineralization of gold deposits. And this event should leaves behind a fingerprint of petrology of mineralogy. This application chooses Linglong and Jiaojia gold ore deposits as the research object with a focus on an analysis of deep xenoliths, gold-carrying minerals characteristics and magma- materials evolution mechanism through the following research: (1) Detailed field investigationon the field geological characteristics of intrusive rocks, intrusive dyke, deep xenoliths, and gold ores, including their distribution, zoning and mineral assemblage characteristics; (2) Systematic microscopic observation on the microscopic characteristics of the orebody, mineral assemblages, texture and structure, try to analyze and define the petrographical composition; (3) High-accuracy mineralogical, geochemical and Tof-SIMS micro area analysis with focuses on the research of the petrochemistry characteristics, the elemental geochemistry characteristics, the Au enrichment regularities and the symbiosis relation between magma- materials evolution. (4) Comprehensive study on the activization, transportation, concentration of the gold-carrying minerals so as to set up a magma- materials evolution model of JGA. Obviously, This project will help to understand the ore-forming material sources and the Au elements geochemical behavior during magmatic processes. This achievement in research would provide important information for further research and prospecting of such deposits.

英文关键词： ore-forming materials sources;enclaves;melt inclusions;Jiaodong gold deposits