Advances in Earth Science ›› 2016, Vol. 31 ›› Issue (4): 391-402. doi: 10.11867/j.issn.1001-8166.2016.04.0391.

Special Issue: 青藏高原研究——青藏科考

• Orginal Article • Previous Articles     Next Articles

Early Paleozoic Magmatism in Himalayan Orogen: The Geochronological Study on Augen Gneisses from Gyirongand Nyalam Areas, Southern Tibet

Xiaoxian Wang 1, 2( ), Jinjiang Zhang 2, Jiamin Wang 2, 3   

  1. 1.Key Laboratory of Crustal Dynamics,Institute of Crustal Dynamics,China Earthquake Administration, Beijing 100085,China
    2.MOE Key Laboratory of Orogenic Belts and Crustal Evolution,School of Earth and Space Sciences,Peking University,Beijing 100871,China
    3.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China
  • Received:2016-01-18 Revised:2016-03-15 Online:2016-04-20 Published:2016-04-10
  • About author:

    First author:Wang Xiaoxian (1986-), male, Qingdao City, Shandong Province, Research Assistant. Research areas include structural geology and tectonics.E-mail:xiaoxianwang@pku.edu.cn

  • Supported by:
    Project supported by the Research Grant from Institute of Crustal Dynamics, China Earthquake Administration “Study on the tectonic activity of northern segment of Red River fault zone”(No.ZDJ2014-09);The National Natural Science Foundation of China “Structural deformation, metamorphism and tectonic evolution of Paiku Co gneiss dome, south Tibet”(No.41402175)

Xiaoxian Wang, Jinjiang Zhang, Jiamin Wang. Early Paleozoic Magmatism in Himalayan Orogen: The Geochronological Study on Augen Gneisses from Gyirongand Nyalam Areas, Southern Tibet[J]. Advances in Earth Science, 2016, 31(4): 391-402.

In the Gyirong and Nyalam areas, a massive amount of augen gneisses are extensively exposed in the middle Himalayan orogen. They consist of quartz, K-feldspar, plagioclase, biotite and minor muscovite. Zircons from augen gneisses have magmatic rims indicated by concentric oscillatory zoning. LA-ICP-MS zircon U-Pb dating gave weighted mean ages of (488.5±1.1) Ma (MSWD=0.6)、(475.1±0.7) Ma (MSWD=1.5) and (468.1±2.5) Ma (MSWD=4.2), hinting early Paleozoic magmatism in the Greater Himalayan Crystalline complex (GHC). The data in this study and other published geochronological results of Cambrian-Ordovician magmatites demonstrated that early Paleozoic orogenesis existed in the Himalayas. Early Paleozoic tectonic events preserved in Himalayas are well compared with the contemporaneous ones in the Lhasa terrane, Qiangtang terrane, Baoshan terrane and Tengchong terrane located in the south and southeast of Tibet Plateau. Integrating previous studies, we suggested an Andean-type orogeny corresponding to dynamic adjusting of the plates by subduction of the Proto-Tethys Ocean lithosphere along the northern margin of Gondwana, instead of Pan-African orogeny that was characterized by the continent-continent collisions during Gondwana assembly.

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