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Science in China Series D: Earth Sciences

, Volume 52, Issue 9, pp 1393–1399 | Cite as

The oldest basement rock in the Yangtze Craton revealed by zircon U-Pb age and Hf isotope composition

  • WenFang Jiao
  • YuanBao Wu
  • SaiHong Yang
  • Min Peng
  • Jing Wang
Article

Abstract

Here we report an integrated study of zircon U-Pb age and Hf isotope composition for a gneiss sample from the Kongling terrain in the Yangtze Craton. CL imaging reveals that most zircons are magmatic, and a few of them have thin metamorphic rims. The magmatic zircons gave a weighted mean U-Pb age of 3218±13 Ma, indicating the gneiss is the oldest basement rock in the Yangtze Craton found to date. They have ɛ Hf(t) value of −2.33±0.51, and two-stage Hf model age of 3679±49 Ma, indicating that the gneiss was derived from partial melting of >3.6 Ga crustal rock. The metamorphic rims yielded an age of 2732±16 Ma, implying that the metamorphic event occurred in the Neoarchean era, which may be also a major tectono-thermal event in the Yangtze Craton.

Keywords

Kongling zircon U-Pb age Hf isotope composition oldest basement rock 

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Copyright information

© Science in China Press and Springer-Verlag GmbH 2009

Authors and Affiliations

  • WenFang Jiao
    • 1
  • YuanBao Wu
    • 1
    • 2
  • SaiHong Yang
    • 1
  • Min Peng
    • 1
  • Jing Wang
    • 1
  1. 1.State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth SciencesChina University of GeosciencesWuhanChina
  2. 2.State Key Laboratory of Continental DynamicsNorthwest UniversityXi’anChina

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