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Geoscience ›› 2019, Vol. 33 ›› Issue (05): 1015-1024.DOI: 10.19657/j.geoscience.1000-8527.2019.05.08

• Petrology • Previous Articles     Next Articles

Geochemical Characteristics and U-Pb Age of Redamen Granites in Western Sichuan, China: Petrogenesis and Tectonic Significance

YUE Xiangyuan1(), YANG Bo2, ZHOU Xiong1, GONG Daxing1, YE Yakang1,3, TAN Hongqi1,3, ZHOU Yu1, ZHU Zhimin1   

  1. 1. Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences, Chengdu,Sichuan 610041, China
    2. Geochemistry Exploration Brigade of Sichuan Bureau of Exploration and Development of Geology and Minerals Resources,Deyang,Sichuan 618000, China
    3. College of Earth Sciences, Chengdu University of Technology, Chengdu,Sichuan 610059, China
  • Received:2019-01-22 Revised:2019-05-22 Online:2019-10-26 Published:2019-10-28

Abstract:

The Redamen quartz diorite is located in the northeastern part of the Songpan-Ganzi orogenic belt. LA-ICP-MS zircon U-Pb dating of the pluton yielded Late Triassic age of (206.4±1.4) Ma. The quartz diorite contains SiO2 contents of 50.62% to 56.66%, K2O/Na2O of 0.32 to 1.20, aluminum saturation index of 0.59 to 0.86, and Rittermann index of 0.40 to 1.20. The samples are subalkaline, metaluminous, and high-K calc-alkaline to calc-alkaline. Total REE (∑REE) contents are of 81.45×10-6 to 222.39×10-6, with LREE/HREE of 5.38 to 10.45 and (La/Yb)N values of 5.98 to 12.99. The rocks show Eu anomalies (δEu=0.66-1.01) and Ce anomalies (δCe=0.81-0.93). The Redamen quartz diorite may have emplaced in a collisional orogenic setting, via magma upwelling and partial melting of the lower crust.

Key words: Songpan-Ganzi orogenic belt, Redamen quartz diorite, U-Pb age, geochemistry, petrogenesis

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