Articles

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 Affiliated withState Key Laboratory of Geological Processes and Mineral Resources, China University of GeosciencesInstitute of Geology, Chinese Academy of Geological Sciences Email author 
  • , Yan Shenghao Affiliated withInstitute of Mineral Resources, Chinese Academy of Geological Sciences
  • , Chen Bailin Affiliated withInstitute of Geomechanics, Chinese Academy of Geological Sciences
  • , Zhou Gang Affiliated withNo. 4 Geological Party, Xinjiang Bureau of Geology and Mineral Resources
  • , He Yongkang Affiliated withNo. 4 Geological Party, Xinjiang Bureau of Geology and Mineral Resources
  • , Chai Fengmei Affiliated withState Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences
  • , He Lixin Affiliated withNo. 4 Geological Party, Xinjiang Bureau of Geology and Mineral Resources
  • , Wan Yusheng Affiliated withInstitute of Geology, Chinese Academy of Geological Sciences

Rent the article at a discount

Rent now

* Final gross prices may vary according to local VAT.

Get Access

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