International Journal of Earth Sciences

, Volume 101, Issue 1, pp 239–252

Exact timing of granulite metamorphism in the Namche-Barwa, eastern Himalayan syntaxis: new constrains from SIMS U–Pb zircon age

  • Wen Su
  • Ming Zhang
  • Xiaohan Liu
  • Jinfu Lin
  • Kai Ye
  • Xin Liu
Short Note

DOI: 10.1007/s00531-011-0656-0

Cite this article as:
Su, W., Zhang, M., Liu, X. et al. Int J Earth Sci (Geol Rundsch) (2012) 101: 239. doi:10.1007/s00531-011-0656-0

Abstract

Zircon grains separated from 2 granulites from the eastern Himalaya were investigated by Raman spectroscopy, cathodoluminescence imaging, and secondary ion mass spectrometry. These grains have a thin homogeneous rim and an oscillatory inner zone domain with or without a relict inherited core. Garnet, kyanite, and rutile inclusions were identified within only the rim domain of zircon grains, indicating that the rim had formed during peak granulite-facies metamorphism. U–Pb zircon data record three distinct age populations: 1,805 Ma (for the inherited core), ca. 500 Ma (oscillatory inner zone), as well as 24–25 Ma and ca. 18 Ma (for the metamorphic rim). These new precision ages suggest that the peak metamorphic age for the HP granulite is at ca. 24–25 Ma, and subsequent amphibolite-facies retrograde metamorphism occurred at ca. 18 Ma.

Keywords

Granulite SIMS U–Pb zircon age High-pressure metamorphism Himalaya 

Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Wen Su
    • 1
  • Ming Zhang
    • 2
  • Xiaohan Liu
    • 3
  • Jinfu Lin
    • 4
  • Kai Ye
    • 1
  • Xin Liu
    • 1
  1. 1.State Key Laboratory of Lithospheric Evolution, Institute of Geology and GeophysicsChinese Academy of SciencesBeijingChina
  2. 2.Department of Earth SciencesUniversity of CambridgeCambridgeUK
  3. 3.Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijingChina
  4. 4.Engineering Research Center of Exploration for Hidden Non-Ferrous and Precious Metal Ore Deposits, Ministry of EducationGuilin University of TechnologyGuilinChina

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