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Geoscience ›› 2013, Vol. 27 ›› Issue (4): 831-840.

• Petrology • Previous Articles     Next Articles

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

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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