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Geoscience ›› 2018, Vol. 32 ›› Issue (04): 680-691.DOI: 10.19657/j.geoscience.1000-8527.2018.04.05

• Petrology • Previous Articles     Next Articles

LA-MC-ICP-MS U-Pb Geochronology and Petrogenesis of Plutons in Baliersi River Area of Altay and Their Geological Implications

ZHU Bopeng(), QIN Jihua, HE Bin, ZHANG Hanqing, WU Xiaogui   

  1. No.4 Geological Party, Xinjiang Bureau of Geology and Mineral Resources Exploration and Development, Altay, Xinjiang 836500, China
  • Received:2017-01-04 Revised:2017-10-20 Online:2018-08-10 Published:2018-09-19

Abstract:

Rock types in the Baliersi River area of the Chinese Altay Orogen (Xinjiang) are complex, including granodiorite, biotite monzogranite and monzogranite. LA-MC-ICP-MS zircon U-Pb dating reveals that the granodiorite and monzogranite were formed at (386.4±2.8) Ma and (386.8±1.2) Ma, respectively. Geochemical analysis of the granodiorite, biotite monzogranite and monzogranite show that the SiO2 contents range from 74.33% to 76.70%, Rittman index (σ) range from 1.49 to 2.04, and the A/CNK values range from 1.00 to 1.07. In addition, the rocks show enrichments in LILEs (e.g., Rb,Th) and LREEs, and obvious depletions in HREEs and HFSEs (e.g., Sr, Ti, Nb) and strong negative Eu anomaly (δEu=0.31 to 0.84), suggesting that the rocks are high-K calc-alkaline, peraluminous highly-fractioned I-type granites. Integrated with previous studies, it is concluded that granitoids in the Baliersi River area were formed in a continental margin magmatic arc setting, via the north-dipping subduction of the Paleo-Asian Ocean.

Key words: granite pluton, LA-MC-ICP-MS zircon U-Pb dating, petrogenesis, Baliersi River, Altay, Xinjiang

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