Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (3): 743-758.doi: 10.13278/j.cnki.jjuese.201503109

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Petrogenesis, Geochemistry and Zircon U-Pb Age of the Granite from No.Ⅵ Section of Hutouya Deposit, Qimantag Area, Qinghai Province, and Its Geological Significance

Yao Lei1,2, Lü Zhicheng2,3, Yu Xiaofei2,3, Pang Zhenshan2,3, Cai Yuqi4, Liu Peng5, Liu Changcheng6, Wang Fenglan7   

  1. 1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;
    2. Mineral Exploration Technical Guidance Center, Ministry of Land and Resources, Beijing 100034, China;
    3. Development and Research Centre, China Geological Survey, Beijing 100037, China;
    4. Beijing Research Institute of Uranium Geology, Beijing 100029, China;
    5. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China;
    6. Yunnan Company (Ltd) of Exploration & Development of Cu Mineral Resources, Kunming 650001, China;
    7. The Fifth Geology Company of Hebei Geology and Minerals Bureau, Tangshan 063000, Hebei, China
  • Received:2014-10-14 Published:2015-05-26

Abstract:

Zircon LA-ICP-MS dating of the granite from the No.Ⅵ section of Hutouya deposit yields an emplacement age of (233.6±1.8) Ma (MSWD=1.2, n=17). The geochemical analysis indicates that the granite belongs to the weakly peraluminous granitic rocks, showing the nature of high-K calc-alkalic series. The rock has high REE content, and the chondrite-normalized REE distribution patterns show the characteristics of LREE enrichment, obvious LREE and HREE fractionation, and significant negative Eu anomaly. The trace element composition of the granite is enriched in Rb, Th, U, La, Nd and poor in Ba, Sr, Nb, P, Ti. The Sr-Nd isotope composition and geochemical characteristics indicate that the magma source of the granite mainly derived from enriched lithospheric mantle. The data of this study indicate that the granite from the No.Ⅵ section of Hutouya deposit formed under a collision, and post-collision setting.

Key words: granite, zircon U-Pb dating, Sr-Nd isotope composition, Hutouya deposit, Qimantag, Qinghai

CLC Number: 

  • P59

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