Chinese Science Bulletin

, Volume 51, Issue 8, pp 952–962

SHRIMP zircon U-Pb dating for subduction-related granitic rocks in the northern part of east Jungaar, Xinjiang

Authors

    • State Key Laboratory of Geological Processes and Mineral ResourcesChina University of Geosciences
    • Institute of GeologyChinese Academy of Geological Sciences
  • Yan Shenghao 
    • Institute of Mineral ResourcesChinese Academy of Geological Sciences
  • Chen Bailin 
    • Institute of GeomechanicsChinese Academy of Geological Sciences
  • Zhou Gang 
    • No. 4 Geological PartyXinjiang Bureau of Geology and Mineral Resources
  • He Yongkang 
    • No. 4 Geological PartyXinjiang Bureau of Geology and Mineral Resources
  • Chai Fengmei 
    • State Key Laboratory of Geological Processes and Mineral ResourcesChina University of Geosciences
  • He Lixin 
    • No. 4 Geological PartyXinjiang Bureau of Geology and Mineral Resources
  • Wan Yusheng 
    • Institute of GeologyChinese Academy of Geological Sciences
Articles

DOI: 10.1007/s11434-008-0952-7

Cite this article as:
Zhang, Z., Yan, S., Chen, B. et al. CHINESE SCI BULL (2006) 51: 952. doi:10.1007/s11434-008-0952-7

Abstract

SHRIMP U-Pb zircon dating on the Xileketehalasu granodiorite porphyry and Kalasayi monodiorite porphyry that intrude middle Devonian Beitashan Formation at the north part of east Junggar region shows that they were formed at 381 ±6 Ma and 376±10 Ma respectively. They are interpreted as subduction-related granitic rocks, which is the first report that the isotopic ages for the granitic rocks range from 350 to 390 Ma. Another determined age for the Kalasayi monodiorite porphyry is 408±9 Ma, representing the age of underlain Lower Devonian volcanic rocks. Thus, the U-Pb dates suggest that the northeastward subduction of Junggar ocean from southwest occurred at 408 to 376 Ma (the real interval may be larger). Because the ore-bearing porphyry intruded following the formation of the volcanic rocks of middle Devonian Beitashan Formation, their tectonic setting is similar to the Andes Mountains that hosts world-class porphyry copper deposits, and the researched area could be regarded as a potential area for prospecting large porphyry copper deposits.

Keywords

SHRIMP U-Pb zircon age subduction granitic porphyry east Jungaar

Copyright information

© Science in China Press 2006