地学前缘 ›› 2020, Vol. 27 ›› Issue (2): 182-196.DOI: 10.13745/j.esf.sf.2020.3.14

• 特色地域成矿背景与成矿作用 • 上一篇    下一篇

中国东部燕山期斑岩钼-热液型铅锌(银)成矿系统的成矿物质来源

谢玉玲(), 崔凯*(), 夏加明, 王莹, 曲云伟, 于超, 单小瑀   

  1. 北京科技大学 土木与资源工程学院, 北京 100083
  • 收稿日期:2020-01-09 修回日期:2020-02-10 出版日期:2020-03-25 发布日期:2020-03-25
  • 通讯作者: 崔凯
  • 作者简介:谢玉玲(1963—),女,教授,博士生导师,主要从事矿床学和矿床地球化学方面的研究。E-mail: yulingxie63@hotmail.com
  • 基金资助:
    国家重点研发计划项目(2017YFC0601302);国家自然科学基金项目(41472072);国家自然科学基金项目(41930427)

The origin of ore-forming materials of the Yanshanian porphyry Mo-hydrothermal Pb-Zn(Ag) metallogenic system in eastern China

XIE Yuling(), CUI Kai*(), XIA Jiaming, WANG Ying, QU Yunwei, YU Chao, SHAN Xiaoyu   

  1. Civil and Resource Engineering School, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2020-01-09 Revised:2020-02-10 Online:2020-03-25 Published:2020-03-25
  • Contact: CUI Kai

摘要:

中国是世界第一大钼生产国和资源国,同时也是铅、锌的重要资源国。中国东部燕山期斑岩型钼矿床及热液脉型、夕卡岩型铅锌(银)矿床是中国钼、铅、锌的主要来源。前人基于斑岩钼和热液型铅锌(银)矿床的地质、地球化学研究,提出了中国东部燕山期斑岩型钼-热液型铅锌(银)成矿系统的新认识,但对该成矿系统的岩浆起源、成矿物质来源等仍存在认识上的分歧。近年来,越来越多的地质、地球化学证据表明,斑岩钼矿的成矿可能与幔源岩浆活动有关,成矿斑岩的Sr、Nd、Pb同位素组成也显示有幔源物质的贡献。碳酸岩作为典型的幔源岩浆岩,是研究地幔物质组成的探针岩石,源自俯冲交代富集地幔的碳酸岩是已知Mo含量最高的岩浆岩,同时其Pb、Zn、Ag含量也很高,并具有富水、富F、富S、富CO2的特征。中国东部与斑岩钼矿同期的碳酸岩、基性岩的地球化学研究表明,中国东部中生代地幔为经历了俯冲交代的富集地幔,富集地幔的部分熔融可能为斑岩钼-热液型铅锌(银)成矿系统提供了成矿岩浆、成矿金属,同时还可能提供了S、F和成矿流体。

关键词: 中国东部, 燕山期, 钼-铅锌(银)成矿系统, 岩浆起源, 成矿物质来源

Abstract:

China is currently the biggest producer of Mo, Pb, and Zn, and it holds the biggest Mo resource and the second biggest Pb and Zn resources in the world. The Yanshanian porphyry Mo deposits and hydrothermal Pb-Zn (Ag) deposits in eastern China are the most important sources of Mo, Pb, and Zn in China, and many geological and geochemical studies have been conducted thereon. It is proposed that the hydrothermal Pb-Zn (Ag) deposits comprise parts of the porphyry Mo metallogenic system. However, there is still a controversary regarding the origin of the parent magma and the ore-forming materials for this metallogenic system. The porphyry Mo deposits have been considered to be related to a typical crust source magma, but further geological and geochemical studies imply that a mantle derived magma was involved in the ore-forming process. Carbonatite, a typical mantle magmatic rock, allows researchers to study the chemical composition of the mantle. Carbonatite derived from the partial melting of the enriched mantle that undergoes melt or fluid metasomatism from a subducted oceanic plate, has the highest Mo content among all kinds of magmatic rocks and also contains large amounts of Pb, Zn, Ag, S, CO2, and H2O. The Sr and Nd isotopic data and trace element results of the causative magmatic rock related to the porphyry Mo deposits in eastern China showed an ocean island basalt affinity, and the coeval mafic rock and carbonatite appeared to originate from the enriched mantle. Thus, this study proposes that the magma related to the Yanshanian Mo-Pb-Zn (Ag) system in eastern China is derived from the partial melting of the enriched mantle, and the ore material and ore-forming fluids may also come from the mantle.

Key words: eastern China, Yanshanian, Mo-Pb-Zn(Ag) metallogenic system, magma source, the origin of ore-forming materials

中图分类号: