Earth Science Frontiers ›› 2019, Vol. 26 ›› Issue (3): 171-182.DOI: 10.13745/j.esf.sf.2018.12.12

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Zircon U-Pb age and Lu-Hf isotope characteristics of the granitic augen gneiss from the Longquanguan shear zone, and their geological significance

WANG Meng,QIAN Jiahui,ZHANG Jinjiang,ZHANG Bo   

  1. 1. School of Earth Science and Resources, Chang'an University, Xi'an 710054, China
    2. School of Earth and Space Sciences, Peking University, Beijing 100871, China
    3. School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China
  • Received:2018-01-15 Revised:2018-03-10 Online:2019-05-25 Published:2019-05-25
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Abstract: The Hengshan-Wutai-Fuping area, located in the middle part of the Trans-North China Orogen with large outcrop of Precambrian rocks, is becoming an ideal place to reveal the early-phase evolutionary history of the North China Craton. The Longquanguan shear zone situated in the junction area of the Wutai and Fuping Complex, and the main rock types are granitic augen gneiss and amphibolite. We conducted LA-ICP-MS zircon U-Pb dating and Lu-Hf isotope analysis for the granitic aguen gneiss from the Longquanguan shear zone. The protolith of the Longquanguan granitic aguen gneiss was crystallized at 2547±7 Ma, with εHf(t) values from +2.7 to +9.2, indicating that the rocks were derived from relatively juvenile continental crust with similar features of the late Archean granitic rocks from the Wutai complex. According to the two-stage Hf model, the zircon ages from the Longquanguan granitic augen gneiss varied from 2872 to 2477 Ma and peaked at 2.58 Ga, 2.71 Ga and 2.81 Ga, coinciding with the Neoarchean continental crustal growth events of the North China Craton.


Key words: zircon U-Pb age, Hf isotope, Longquanguan shear zone, North China Craton

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