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JIN Xia, HUANG Zeng-bao. Geochemical Characteristics and Tectonic Implications of Wutongjin Granitic Gneisses in the Mazongshan Area, Gansu Province[J]. Northwestern Geology, 2007, 40(3): 44-51.
Citation: JIN Xia, HUANG Zeng-bao. Geochemical Characteristics and Tectonic Implications of Wutongjin Granitic Gneisses in the Mazongshan Area, Gansu Province[J]. Northwestern Geology, 2007, 40(3): 44-51.
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Geochemical Characteristics and Tectonic Implications of Wutongjin Granitic Gneisses in the Mazongshan Area, Gansu Province

  • Geological Survey of Gansu Province, Lanzhou 735000, China

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  • Received Date: February 09, 2007
  • Revised Date: April 04, 2007
  • Published Date: September 04, 2007
    Graphical Abstract
    • Abstract
  • The Wutongjin granitic gneisses is exposed in the Beishan area, Gansu Province. The Wutongjin granitic gneisses arem etalum in ous(Al2O3=11.45%～16.07%) and characterized by high SiO2 (61.03%～75.28%),Na2O+K2O (6.74%～8.24%) and TFeO/MgO radios, and high REE(102.17×10-6～372.17×10-6), Y, Nb, and low CaO (0.13%～5.53%)contents. The characteristics are obviously different from those observed from I-and S-type granites, but quite similar to A2 type granites. The Wutongjin granitic gneisses has given a U-Pb isochron age of 558 Ma. Therefore, it is suggested that a crustal rifting eventmight have started in the Beishan a readuring Neoproterozoic.
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