Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (6): 1757-1771.doi: 10.13278/j.cnki.jjuese.201506116

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SHRIMP Zircon U-Pb Geochronology of Northern Highland 4337 Granodiorite in Kaladawan Area of Northern Altun Mountains and Its Tectonic Implications

Meng Lingtong1, Chen Bailin1, Luo Dike2, Wang Yong1, Sun Yue1,3, Wu Yu1, Zhang Hao3, Wang Tong3   

  1. 1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;
    2. Department of Energy and Mineral Resources, Citic Construction CO., LTD, Beijing 100027, China;
    3. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
  • Received:2014-12-25 Published:2015-11-26

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Abstract:

Kaladawan area of the eastern Altun Mountains of Xinjiang is tectonically located between the NE-trending Altyn Tagh strike-slip fault and the EW-trending northern Altyn Tagh fault, where the intermediate-acid intrusive rocks are wildly distributed. The granodiorite in the north of Highland 4337 is selected to study the tectonic evolution of the Kaladawan area. The geochemical data of the intrusion suggests that it is high-K calc-alkaline I-type granitic rock which was likely derived from a partial melting of the intermediate- to high-K meta-andesitic-basaltic rocks under high pressure. Zircon U-Pb age obtained by SHRIMP from the granodiorite is (494.4±5.5) Ma, implying that it was emplaced in the Late Cambrian period. Integrated with geochemistry, trace element discrimination, geochronology, and regional background, it is inferred that the granodiorite was formed in a subduction-related active continental margin (continental arc). In combination with the previous studies of magmatic activity in Kaladawan area, we suggest that the central Altun block were developed in Early Paleozoic into an active continental margin (continental arc), and a magmatic belt were caused by the southward subduction of an oceanic crust to central Altun block during Late Cambrian to Early-Middle Ordovician. Compared to the ages of the intermediate-acid intrusive rocks of north Altyn Tagh area, the evolution of western and eastern parts is different. The west of north Altyn Ocean subduction lasted relatively longer than the east,and the syn-collision stage in the east was earlier than in the west.

Key words: Altun Mountains, Kaladawan area, petrogeochemistry, zircon SHRIMP U-Pb dating, partial melting, active continental margin

CLC Number: 

  • P588.12

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