Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (6): 1702-1712.doi: 10.13278/j.cnki.jjuese.201506112

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Zircon U-Pb Isotopic Chronology and Hf Isotopes of Diorites from Kawabulak Complex,Central Tianshan

Nijat Abdursul1,2, Muhtar Zari1,2, Wu Zhaoning1   

  1. 1. College of Geology and Mining Engineering, Xinjiang University, Urumqi 830046, China;
    2. Xinjiang Key Laboratory for Geodynamic Processes and Metallogenic Prognosis of the Central Asian Orogenic Belt, Xinjiang University, Urumqi 830046, China
  • Received:2015-01-20 Published:2015-11-26

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Abstract:

Kawabulak complex is distributed within Kawabulak-Aktagh area in the east section of Central Tianshan block, and extended nearly latitudinally along the Kawabulak fault. We present zircon LA-ICP-MS U-Pb chronology and LA-MC-ICP-MS Hf isotopes analyses of diorites that comprise the main parts of the intermediate and basic rocks of the complex. The zircons of diorites are mainly euhedral and hypidiomorphic texture with clear rings and high Th/U ratios(>0.40). The Th and U contents show a well positive correlation. This indicates that the zircons are typically from magma. The results show that the diorites intruded during the Late Devonian period with the 206Pb/238U weighted average age of 375±1 Ma (MSWD=0.081). Zircon Hf analyses show a relatively homogeneous isotopic composition; the initial Hf values fall in between 0.282 655-0.282 747 and positive εHf(t) values of +4.0-+7.2 with a depleted mantle mode age (from 714 to 842 Ma). Combining with previous studies, we suggest that the diorites from Kawabulak complex were formed through a partial melting of depleted lithospheric mantle.

Key words: Central Tianshan, Kawabulak, diorite, zircon U-Pb dating, Hf isotopes

CLC Number: 

  • P588.12

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