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Gold Science and Technology ›› 2017, Vol. 25 ›› Issue (2): 14-22.

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Study on the Niobium Minerals Characteristic of Alkaline Rock and Its Genetic Mechanism in Southeastern Shaanxi

ZHANG Sui’an1，LIU Neng1，LIU Wenju2，LIU Xinhui1，3，ZHENG Jing1，KANG Qinqin1，LUO Ting1   

  1. 1.Geological Survey Center in Shaanxi Province，Xi’an    710016，Shaanxi，China；
    2.Geological Survey Institute in Shaanxi Province，Xi’an   710016，Shaanxi，China；
    3.No.5 Gold Geological Party of CAPF，Xi’an    710100，Shaanxi，China
  • Received:2016-11-16 Revised:2017-03-01 Online:2017-04-28 Published:2017-05-12

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Abstract:

Southeastern Shaanxi is located in the Neoproterozoic-Mesozoic Qinling-Dabie orogenic belt，the southern Yangtze Craton.Through the Jinning，Caledonian，Indosinian Yanshan period of tectonic evolution，a series of basic rock-alkalic-intermediate rock，the post magmatic hydrothermal metasomatism，and the shallow phase-overflow facies magmatite niobium tantalum，rare earth，gold，iron ore formed.Based on the field investigation，the alkalic-intermediate rocks can be divided into alkali syenite diorite，alkali syenite porphyry，crooked long （albite） trachyte，trachyte tuff，and trachytic breccia lava.Field investigations and laboratory study suggest that the alkalic- intermediate rocks are subjected to intensive metasomatic alteration，mainly including sodium，potassium，silicification，aegirine petrochemical，biotitization，epidotization，chloritization and carbonatization.The Nb-bearing minerals comprise  niobite，niobite bearing tantalum，euxenite，fergusunite，loparite determined by optical microscope and electron probe.Combined with all the observations，we propose columbium-tantalum mineralization can be divided into two stages：the early rock crystallization process and the late metasomatic alteration.In the stage 1，niobium and tantalum in the simple form into titanium pyroxene.Whilst，the titanium pyroxene was subjected to potassic alteration and the biotite，chlorite，epidote，ilmenite，magnetite，Nb iron ore，tantalum ore，rare-earth minerals formed.

Key words: alkalic rock, niobium-tantalite, rare earth, genetic mechanism, southeastern , Shaanxi

CLC Number: 

  • 10.11872/j.issn.1005-2518.2017.02.014

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