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现代地质 ›› 2013, Vol. 27 ›› Issue (4): 888-894.

• 矿床学 • 上一篇    下一篇

内蒙古林西萤石矿床石英ESR年龄及其地质意义

曹华文,张寿庭,邹灏,方乙,张鹏,王光凯   

  1. (地质过程与矿产资源国家重点实验室 中国地质大学 地球科学与资源学院,北京100083)
  • 出版日期:2013-08-10 发布日期:2013-08-07
  • 通讯作者: 张寿庭,男,教授,博士生导师,1964年出生,矿产普查与勘探专业,主要从事矿产资源勘查与评价等方面教学研究工作。
  • 作者简介:曹华文,男,博士研究生,1988年出生,矿产普查与勘探专业,主要从事矿产资源勘查与评价工作。 Email:caohuawen1988@126.com。
  • 基金资助:

    国家科技支撑计划项目(2011BAB04B06);国土资源部地质大调查项目(1212011182388,1212011220925)。

ESR Dating of Quartz from Linxi Fluorite Deposits, Inner Mongolia and Its Geological Implications

CAO Hua-wen, ZHANG Shou-ting, ZOU Hao, FANG Yi, ZHANG Peng, WANG Guang-kai   

  1. (State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences and Resources, China University of Geosciences,Beijing100083, China)
  • Online:2013-08-10 Published:2013-08-07

摘要:

内蒙古林西地区萤石矿床主要赋存于晚古生代—中生代火山-沉积地层和酸性侵入岩体中,矿体主要受南北向和北北东向断裂破碎带控制。萤石矿床中共生有大量同期形成的石英(脉),运用石英热活化电子自旋共振(ESR)测年法,对萤石矿床中8件与萤石共生的石英进行年代学研究,来探讨林西萤石矿床的形成时代。结果表明,林西萤石矿床中的石英ESR年龄范围为126.6~157.3 Ma,平均年龄为137 Ma,表明研究区萤石矿床成矿时代主要为侏罗纪晚期—白垩纪早期。与全球其他地区萤石矿床成矿时代对比,并结合本区萤石矿床地质特征,认为林西萤石矿为中—低温热液裂隙充填型萤石矿床,形成于燕山中期板内构造体制转换时期。

关键词: 内蒙古林西, 萤石矿床, ESR年龄, 矿床成因

Abstract:

The Linxi fluorite deposits, Inner Mongolia, are mainly hosted in the vocanic-sedimentary stratum and acidic intrusions in the Late Paleozoic-Mesozoic, controlled by the NS and the NNE trending fault zone. Quartzs (quartz vein) are massively formed within the same period in the deposit. The ESR dating was used to study the fluorite-forming time by measuring the 8 pieces of paragenetic quartz samples in the deposits. The results show that the ESR dating of quartzs from Linxi fluorite deposits ranges from 126.6 to 157.3 Ma, with an average of 137 Ma, indicating that the metallogenic hydrothermal fluid mainly formed in the Late Jurassic-Early Cretaceous. Combined with geological characteristics of deposits and the global fluorite deposits, Linxi fluorite deposits are of hydrothermal origin, and of fracture-filled metasomatic type, which are formed in the conversion period of the middle Yanshanian stage intraplate tectonic regime.

Key words: Linxi, Inner Mongolia, fluorite deposit, ESR dating, genesis of deposi

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