地学前缘 ›› 2020, Vol. 27 ›› Issue (2): 294-319.DOI: 10.13745/j.esf.sf.2020.3.23

• 特色地域成矿背景与成矿作用 • 上一篇    下一篇

中哈吉乌天山变形带容矿金矿床:成矿环境和控矿要素与找矿标志

薛春纪,赵晓波,赵伟策,赵云,张国震,Bakhtiar NURTAEV,Nikolay PAK,莫宣学   

  1. 1. 地质过程与矿产资源国家重点实验室; 中国地质大学(北京) 地球科学与资源学院, 北京 100083
    2.中国地质调查局 天津地质调查中心,天津 300170
    3.乌兹别克斯坦地质与矿产资源委员会 地质与地球物理研究所,塔什干 100041
    4.吉尔吉斯斯坦科学院 地质研究所,比什凯克 720040
  • 收稿日期:2019-12-18 修回日期:2020-03-11 出版日期:2020-03-25 发布日期:2020-03-25
  • 作者简介:薛春纪(1962—),男,博士,教授,主要从事矿床学和矿产预测教学与研究。E-mail:chunji.xue@cugb.edu.cn
  • 基金资助:

    国家重点研发计划项目“深地资源勘查开采”重点专项(2017YFC0601202)

Deformed zone hosted gold deposits in the ChinaKazakhstanKyrgyzstanUzbekistan Tian Shan: metallogenic environment, controlling parameters, and prospecting criteria.

XUE Chunji,ZHAO Xiaobo,ZHAO Weice,ZHAO Yun,ZHANG Guozhen,Bakhtiar NURTAEV,Nikolay PAK,MO Xuanxue   

  1. 1. State Key Laboratory of Geological Processes and Mineral Resources; School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China
    2.  Tianjin Center,China Geological Survey,Tianjin 300170,China
    3.  Institute of Geology and Geophysics,State Committee of the Republic of Uzbekistan on Geology and Mineral Resources,Tashkent 100041,Uzbekistan
    4.  Institute of Geology,National Academy of Sciences of Kyrgyz Republic,Bishkek 720040,Kyrgyzstan
  • Received:2019-12-18 Revised:2020-03-11 Online:2020-03-25 Published:2020-03-25

摘要:

天山是全球第二大金矿富集区,世界级和大型超大型金矿床东西成带横贯中国新疆中部—哈萨克斯坦东南部—吉尔吉斯斯坦—乌兹别克斯坦,构成巨型跨境金成矿带。天山巨型跨境金成矿带和重要金矿床形成的地质环境、成矿的控制要素、找矿勘查的标志都是学术界和工业界高度关注的重大地质和找矿问题。通过广泛、深入地文献调研和境内外天山较全面野外地质矿产调查与研究,本文认为中哈吉乌天山大规模金成矿主体形成于晚石炭世—早二叠世古亚洲洋闭合后的陆块拼贴变形过程,部分形成于中—晚二叠世陆内走滑变形过程。中天山南、北缘古缝合带及其附近的大型脆性/韧脆性变形带是巨量金成矿的关键控制因素,多期叠加复合成矿是天山变形带容矿金矿床的显著特征。地壳初始富集、构造变形活化、岩浆热液叠加是天山变形带容矿金矿床的主控因素。“碳质细碎屑岩+脆韧性变形带+海西末期岩体”是中哈吉乌天山变形带容矿大型超大型金矿的找矿标志组合。

关键词: 大型金矿床, 大型变形带, 陆块拼贴变形, 陆内走滑变形, 中哈吉乌天山

Abstract:

Tian Shan is the worlds second largest gold ore cluster and hosts an array of worldclass and large/superlarge gold deposits. It constitutes a giant crossborder gold metallogenic belt that extends westward from Central Xingjiang, China to Uzbekistan, via southeastern Kazakhstan and Kyrgyzstan. What metallogenic settings have been responsible for the largescale gold mineralization of the Tian Shan giant gold belt? What are the key factors controlling gold mineralization? What are the criteria for gold prospecting in  Tian Shan giant gold belt? All of these are crucial geological and prospecting problems that have become the focus of the academics and mining industry. Based on an extensive and thorough literature review, along with comprehensive field investigations on the geology and gold deposits of  Tian Shan orogen, this paper suggests that the largescale gold mineralization of Tian Shan had formed during a terrane assembling deformation subsequent to the final closure of the paleoAsian Ocean in the Late CarboniferousEarly Permian. On the other hand, minor gold mineralization had formed during intracontinental strikeslip deformation in the MiddleLate Permian. The large brittle/ductilebrittle deformation zones, situated near the tectonic sutures of the northern and southern margins of the Middle Tian Shan, are the key factors controlling the largescale gold mineralization of  Tian Shan. Multistage overprinting mineralization is a significant feature of the Tian Shan deformed zonehosted gold deposits. The crustal initial enrichment, structural deformation activation, and magmatichydrothermal overprinting are the main factors controlling the Tian Shan deformed zonehosted gold deposits. Finegrained carbonaceous clastic rocks, ductilebrittle deformed zones, and late Hercynian granitic intrusions are the key prospecting criteria for the deformed zonehosted gold deposits in the ChinaKazakhstanKyrgyzstanUzbekistan Tian Shan gold ore belt.

Key words: large gold deposit, largescale deformed zone, terrane assembling deformation, intracontinental strikeslip deformation, ChinaKazakhstanKyrgyzstanUzbekistan Tian Shan

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