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Chinese Journal of Geochemistry

, Volume 11, Issue 2, pp 111–120 | Cite as

Sm-Nd and zircon U-Pb isotopic constraints on the age of formation of the precambrian crust in Southeast China

  • Li Xianhua 
  • Zhao Zhenhua 
  • Gui Xuntang 
  • Yu Jinsheng 
Article

Abstract

Nd model ages (T DM) of the Pre-Mesozoic crustal rock samples from Southeast China range from 1.2 to 3.2 Ga. Two age peaks of 1.4 Ga and 1.8 Ga are observed in the histogram ofT DM model ages. Available U-Pb zircon inheritance ages are concentrated around 1.2–1.4 Ga, 1.8 Ga and 2.5 Ga, respectively. The combined use of Sm-Nd and U-Pb zircon inheritance ages suggests that the formation of the Precambrian crust is of episodic character. The oldest crustal nucleus may have been formed during the Late Archean (2.5 Ga or older?). A rapid production of the crust took place 1.8 Ga ago, consistent with the global crust formation event at 1.7–1.9 Ga. Another important episode of the addition of juvenile crustal material from the mantle in Southeast China took place 1.2–1.4 Ga ago, during which the pre-existing crust was strongly reworked and/or remelted.

Keywords

Continental Crust Crustal Rock Crustal Growth Deplete Mantle Crustal Sample 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Institute of Geochemistry, Chinese Academy of Sciences 1992

Authors and Affiliations

  • Li Xianhua 
    • 1
  • Zhao Zhenhua 
    • 1
  • Gui Xuntang 
    • 1
  • Yu Jinsheng 
    • 1
  1. 1.Guangzhou Branch, Institute of GeochemistryAcademia SinicaGuangzhou

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