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现代地质 ›› 2013, Vol. 27 ›› Issue (4): 831-840.

• 岩石与矿物 • 上一篇    下一篇

内蒙古宝音图钼矿床花岗岩稀土元素地球化学特征及花岗岩成因

杨帆1,肖荣阁1,李娜1,曲云燕1,贺中银2,冯罡2   

  1. (1.中国地质大学 地球科学与资源学院,北京100083;2.内蒙古第八地质矿产勘查开发院,内蒙古 乌海016000)
  • 出版日期:2013-08-10 发布日期:2013-08-07
  • 作者简介:杨帆,女,博士研究生,1983年出生,矿物学、岩石学、矿床学专业,主要从事矿床地球化学的研究工作。Email:yf_2003@163.com。
  • 基金资助:

    国家自然科学基金项目(40073013);河南省国土资源厅勘查项目(2012006);内蒙古自治区地质矿产勘查开发局勘查项目(NMKD2008-01)。

REE Geochemical Characteristics and Genesis of Granites in Baoyintu Molybdenum Deposit, Inner Mongolia

(1.中国地质大学 地球科学与资源学院,北京100083;2.内蒙古第八地质矿产勘查开发院,内蒙古 乌海016000)   

  1. (1.School of Earth Sciences and Resources, China University of Geosciences, Beijing100083, China; 2.Inner Mongolia Eighth Geological Mineral Exploration Institute, Wuhai, Inner Mongolia016000, China)
  • Online:2013-08-10 Published:2013-08-07

摘要:

宝音图钼矿床是近几年在内蒙古西部地区发现的大型斑岩型钼矿床。重点研究该钼矿床成矿花岗岩稀土元素地球化学特征,探讨花岗岩成因。通过对稀土元素配分模式和特征值(∑REE-LREE/HREE、δEu-LREE/HREE相关性)的分析,对比幔源岩浆及南岭花岗岩稀土元素组成特点,结合岩石化学组成,推断宝音图成矿花岗岩属于陆壳熔融成因花岗岩。由斜长花岗岩→二长花岗岩→钾长花岗岩→细晶花岗岩,岩体成分逐渐变化。岩浆演化中有成分分异,有利于成矿,特别是晚期钾长花岗岩富集成矿元素和矿化剂元素。

关键词: 宝音图钼矿床, 复式花岗岩体, 陆壳熔融, 稀土元素配分模式, 铕异常, 内蒙古

Abstract:

The Baoyintu molybdenum deposit, located in western Inner Mongolia, is a large scale porphyry molybdenum deposit which is discovered in recent years. This paper focuses on discussing REE geochemistry of ore-forming granites and genesis of granites. Based on analyses of REE distribution patterns, characteristic value (including ∑REE-LREE/HREE and δEu-LREE/HREE) and petrochemical compositions, comparisons with REE compositions of mantle-derived magma and Nanling granites, authors deduce that genesis of ore-forming granites is related to melting of the continental crust.The compositions of granites vary in the sequence of plagiogranite→monzoniticgranite→K-feldspar granite→graniteaplite. The chemical variation during the magmatic evolution process is in favour of mineralization,especially the late-stage K-feldspar granites.

Key words: Baoyintu molybdenum deposit, complex granitic intrusive, melting of the continental crust, REE distribution pattern, Eu anomaly, Inner Mongolia

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