Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (2): 441-452.doi: 10.13278/j.cnki.jjuese.201502109

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Mesozoic Volcanic Rocks Geochronology and Geochemical Characteristics in Wulangai Basin of Inner Mongolia and Their Geological Significance

Sun Shouliang, Li Yongfei, Gao Xiaoyong   

  1. Shenyang Institute of Geology and Mineral Resources/Shenyang Center of Geological Survey, China Geological Survey, Shenyang 110034, China
  • Received:2014-06-18 Published:2015-03-26

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Abstract:

The detailed petrology, Laser 40Ar/39Ar dating and the geochemical characteristics of the Mesozoic volcanic rocks from Wulangai basin of the Western Great Xing'an Mountain have been studied on the ground of their genesis and geological implication. We suggest that the Mesozoic volcanic rocks of Wulangai basin are mainly medium (andesite) and acid rocks (rhyolite) in the age of (151.8±1.5)-(120.2±1.8) Ma by the methods of Laser 40Ar/39Ar dating, identical to the Late Jurassic to Early Cretaceous. The volcanic rock types are medium to acid rocks of the Calc-Alkaline to high-K Calc-Alkaline. The geochemical characteristics is the same as crustal rocks'. This indicates that it derived from the partial melting of the crustal material. The volcanics from Wulangai basin should be result from the collision of Mongol-Okhotsk(Paleo-Pacific) orogenic belt and the thickened lower crust in Early Cretaceous around 151.8 Ma. Combined with the background of the magma dynamics and the nature of the magma, the volcanics were from the partial melting of the thickened orogenic belt.

Key words: Wulangai basin, Mesozoic, volcanic rocks, Laser 40Ar/39Ar dating, geochemical

CLC Number: 

  • P59

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