地学前缘 ›› 2020, Vol. 27 ›› Issue (2): 79-98.DOI: 10.13745/j.esf.sf.2020.3.13

• 矿床研究方法与综述 • 上一篇    下一篇

Au-(Ag)-Te-Se成矿系统与成矿作用

刘家军1,2(), 翟德高1,2, 王大钊3, 高燊4, 尹超1,2, 柳振江1,2, 王建平1,2, 王银宏1,2, 张方方1,2   

  1. 1.中国地质大学 地质过程与矿产资源国家重点实验室, 北京 100083
    2.中国地质大学(北京) 地球科学与资源学院, 北京 100083
    3.东华理工大学 核资源与环境国家重点实验室, 江西 南昌 330013
    4.中国科学院 地质与地球物理研究所 中国科学院矿产资源研究重点实验室, 北京 100029
  • 收稿日期:2020-01-18 修回日期:2020-02-25 出版日期:2020-03-25 发布日期:2020-03-25
  • 作者简介:刘家军(1963—),男,教授,博士生导师,主要从事矿床学研究。E-mail: liujiajun@cugb.edu.cn
  • 基金资助:
    国家自然科学基金项目(41730426);国家自然科学基金项目(41573036);中国地质调查局中国矿产地质志项目(DD20190379-87)

Classification and mineralization of the Au-(Ag)-Te-Se deposits

LIU Jiajun1,2(), ZHAI Degao1,2, WANG Dazhao3, GAO Shen4, YIN Chao1,2, LIU Zhenjiang1,2, WANG Jianping1,2, WANG Yinhong1,2, ZHANG Fangfang1,2   

  1. 1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China
    2. School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China
    3. State Key Laboratory of Nuclear Resource and Environment, East China University of Technology, Nanchang 330013, China
    4. Key Laboratory of Mineral Resources,Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
  • Received:2020-01-18 Revised:2020-02-25 Online:2020-03-25 Published:2020-03-25

摘要:

根据金矿床中碲、硒赋存特点与富集程度,可将Au-(Ag)-Te-Se成矿系统的矿床成因类型划分为:(1) 浅成低温热液型金-银矿床;(2) 造山型金矿床;(3) 卡林-类卡林型金矿床;(4) 碱性-偏碱性侵入岩型金矿床;(5)斑岩型(铜)金矿床;(6) 夕卡岩型(铜)金矿床;(7) VMS型金多金属矿床。碲、硒都是亲地幔的元素,侵入岩与火山岩是Au-(Ag)-Te-Se成矿系统中碲、硒的重要来源,黑色岩系也是硒的重要来源。温度、pH、氧逸度等是控制Te、Se的迁移与富集的重要因素。Au-(Ag)-Te-Se成矿系统的成矿机制与岩浆脱气、流体-熔体分离、水-岩反应、流体沸腾与混合、有机作用密切相关。其中岩浆脱气、流体-熔体分离、流体沸腾与流体混合是碲化物型金矿床的重要成矿机制,而水-岩反应、流体混合、有机作用是硒化物型金矿床的重要成矿机制。在成矿过程中,先期形成一些亚稳定或不稳定的过渡态矿物易发生固溶体分离作用,或是不饱和流体与已形成的矿物发生溶解-再沉淀作用,导致矿石具有丰富的物质组成和结构特点。

关键词: 金矿床, Au-(Ag)-Te-Se成矿系统, 矿床成因类型, 成矿作用

Abstract:

The genetic types of Au-(Ag)-Te-Se metallogenic systems can be classified according to the characteristics of occurrence and degrees of tellurium and selenium enrichment in gold deposits as (1) epithermal Au-Ag deposits, (2) orogenic gold deposits, (3) Carlin and Carlin-like gold deposits, (4) alkaline and subalkaline intrusion-related gold deposits, (5) Cu-Au porphyry deposits, (6) Cu-Au skarn deposits, and (7) gold-polymetallic volcanogenic massive sulphide (VMS) deposits. Tellurium and selenium preferentially partition in the mantle while intrusive and volcanic rocks are important sources of Te and Se in the Au-(Ag)-Te-Se metallogenic system. Moreover, black rock series are important sources of Se, whilst temperature, pH and oxygen fugacity are important controllers of Te-Se transport and enrichment. The ore-forming mechanisms of the Au-(Ag)-Te-Se metallogenic systems are closely related to magmatic degassing, fluid-melt separation, water-rock interactions, fluid boiling and mixing, and organic processes. Among them, magmatic degassing, fluid-melt separation, fluid boiling and mixing are important mechanisms in the formation of telluride-rich gold deposits, while water-rock interactions, fluid mixing and organic processes are important mechanisms in the formation of selenide-rich gold deposits. During ore formation, some metastable or unstable minerals precipitated in early stages usually experience solid solution separation, and minerals in contact with unsaturated fluids often trigger coupled dissolution-reprecipitation reactions; both processes result in the formation of various mineral assemblages and ore textures.

Key words: gold deposit, Au-(Ag)-Te-Se metallogenic system, genetic types of deposits, metallogenesis

中图分类号: