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

  • Zhang Zhaochong 
  • Yan Shenghao 
  • Chen Bailin 
  • Zhou Gang 
  • He Yongkang 
  • Chai Fengmei 
  • He Lixin 
  • Wan Yusheng 
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 agesubductiongranitic porphyryeast Jungaar

Copyright information

© Science in China Press 2006

Authors and Affiliations

  • Zhang Zhaochong 
    • 1
    • 2
  • Yan Shenghao 
    • 3
  • Chen Bailin 
    • 4
  • Zhou Gang 
    • 5
  • He Yongkang 
    • 5
  • Chai Fengmei 
    • 1
  • He Lixin 
    • 5
  • Wan Yusheng 
    • 2
  1. 1.State Key Laboratory of Geological Processes and Mineral ResourcesChina University of GeosciencesBeijingChina
  2. 2.Institute of GeologyChinese Academy of Geological SciencesBeijingChina
  3. 3.Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijingChina
  4. 4.Institute of GeomechanicsChinese Academy of Geological SciencesBeijingChina
  5. 5.No. 4 Geological PartyXinjiang Bureau of Geology and Mineral ResourcesAltayChina