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现代地质 ›› 2007, Vol. 21 ›› Issue (Suppl): 6-11.

• 地质学 • 上一篇    下一篇

内蒙古大井锡多金属矿床喷流沉积成因的地球化学证据

王长明1,2,张寿庭1,2,邓军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 岩石圈构造、深部过程及探测技术教育部重点实验室,北京100083
  • 收稿日期:2006-10-20 修回日期:2006-11-22 出版日期:2007-08-20 发布日期:2007-08-20
  • 作者简介:王长明,男,博士研究生,1974年出生,矿物学、岩石学、矿床学专业,主要从事金属矿床和地质调查的研究工作。
  • 基金资助:

    教育部科学技术研究重点项目(03178);教育部跨世纪人才基金项目;国家自然科学基金项目(40172036);教育部博士点基金及地质过程与矿产资源实验室基金项目(GPMR200644)

AGeochemical Evidence for Exhalative Genesis of the Dajing Sn-polymetallic Deposit in Inner Mongolia, China

WANG Chang-ming1,2, ZHANG Shou-ting1,2, DENG Jun1,2   

  1. 1State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences, Beijing100083,China;
    2Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education,China University of Geosciences,Beijing100083,China
  • Received:2006-10-20 Revised:2006-11-22 Online:2007-08-20 Published:2007-08-20

摘要:

内蒙古自治区林西县大井矿床是大兴安岭南段的一个大型Sn-Cu-Ag-Zn-Pb矿床,燕山期火山侵入岩广泛出露,因此认为该矿床为与燕山期岩浆活动有关的热液矿床。通过对矿床地球化学特征的系统研究,并结合矿床地质特征,得出如下主要研究成果:(1)对岩矿石和矿物的化学组成、微量元素和稀土元素地球化学的研究表明,大井锡多金属矿床为同生热水沉积作用的产物;(2)热水沉积岩的碳、氧同位素组成关系可与许多沉积喷流型块状硫化物矿石及其共生的喷流岩相对比,暗示了两者具有相似的形成机理;(3)矿石的铅同位素资料显示,大兴安岭南段在二叠纪沉积盆地演化过程中可能曾经有重要的水下热液沉积喷流成矿作用发生。

关键词: 地球化学, 喷流沉积成因, 大井锡多金属矿床, 内蒙古

Abstract:

The Dajing deposit in Linxi County,Inner Mongolia Autonomous Region,China,is a large scale Sn-Cu-Ag-Zn-Pb deposit in the southern section of the Da Hinggan area where Jurassic-Cretaceous volcanic-plutonic rocks are wide spread.So was regarded as epigenetic hydrothermal deposit in genetic  connection with the Mesozoic magmatism. By studying geochemical characteristics of the Dajing deposit associated with some deposit geological characteristics, the following research achievements have been obtained:(1)a geochemical study on geochemical compositions,trace elements and rare earth elements on the ores and mineral from the Dajing Sn-polymetallic deposit showed that the deposit might be of syngenetic hydrothermal sedimentary origin;(2)the relationship between carbon and oxygen isotopes in hydrothermal sedimentary rocks were comparable overall with many sedex-type sulfide ores and associated exhalites,implying a similar genesis for these deposits;(3)the lead isotope data of the ores indicate that subaqueous exhalative mineralization occured during the basin evolution at the Permian time in the Dajing deposit.

Key words: geochemical evidence, exhalative genesis, the Dajing Sn-polymetallic deposit, Inner Mongolia

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