Science China Earth Sciences

, Volume 54, Issue 12, pp 1871–1879 | Cite as

Opening of an early Paleozoic limited oceanic basin in the northern Altyn area: Constraints from plagiogranites in the Hongliugou-Lapeiquan ophiolitic mélange

  • XiaoFeng Gao
  • PeiXi Xiao
  • Lei Guo
  • ZengChan Dong
  • RenGang Xi
Research Paper
First Online:
Received:
Accepted:

Abstract

This paper reports petrological and geochemical features and zircon U-Pb age of plagiogranite from the Hongliugou-Lapeiquan ophiolitic mélange belt in the northern Altyn Tagh. The zircon U-Pb dating results yield a mean 238U/206Pb age of 512.1 ± 1.5 Ma, representing an emplacement time of the plagiogranites in the Middle Cambrian. The plagiogranites are interpreted to have derived from anatexis of hydrated amphibolites by ductile shearing during transports of the oceanic crust. Thus it is believed that the formation age of such type of plagiogranite was coeval to or slightly younger than the spreading of the Hongliugou-Lapeiquan limited oceanic basin. The new results from the plagiogranites suggest that an oceanic basin existed in the northern Altyn area during the Middle Cambrian.

Keywords

plagiogranite limited oceanic basin early Paleozoic northern Altyn area 
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Copyright information

© Science China Press and Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • XiaoFeng Gao
    • 1
  • PeiXi Xiao
    • 1
  • Lei Guo
    • 1
  • ZengChan Dong
    • 1
  • RenGang Xi
    • 1
  1. 1.Xi’an Institute of Geology and Mineral ResourcesXi’anChina

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