Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (2): 303-320.doi: 10.13278/j.cnki.jjuese.201602101

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Liaodong Peninsula ~2.2 Ga Magmatic Event and Its Geological Significance

Chen Bin1, Li Zhuang2, Wang Jialin2, Zhang Lu2, Yan Xuelong2   

  1. 1. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;
    2. Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China
  • Received:2015-10-12 Online:2016-03-26 Published:2016-03-26
  • Supported by:

    Supported by the National Key Basic Research Program of China (2012CB416603),The National Natural Science Foundation of China (90914001),The Opening Foundation of the Peking University (0000010541) and Undergraduates Innovating Experimentation Project of Jilin University (2010C61164)

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Abstract:

The geochronology and geochemical studies were carried out on the Paleoproterozoic meta-volcanic rocks and the Liaoji granite from Jiao-Liao-Ji mobile belt in North China craton to understand the~2.2 Ga magmatic event and its geodynamic setting. The zircon LA-ICP-MS U-Pb analyses on the meta-andesites yield 207Pb/206Pb ages of (2182±6) Ma and (2229±22) Ma. These zircons exhibit oscillatory and sector-zoning and high Th/U ratios (>0.5), the typical magmatic origin; thus the ages probably represent the formation ages of the protolith of the meta-volcanic rocks. The zircons from the Paleopr oterozoic Liaoji granite share the similar magmatic characteristics with those from the meta-volcanic rocks, e.g., oscillatory and sector-zoning, and high Th/U ratios (>0.3). The zircon U-Pb isotopic dating by using the LA-ICP-MS method on the Paleoproterozoic Liaoji granite reveals that they formed at (2199±10) Ma, which are regionally comparable to those of the Paleoproterozoic meta-volcanic rocks. Our age data suggest a synchronism for the two rock units, rather than that the Paleopreoterozoic Liaoji granites were the basement of Liaohe Group volcanic rocks as considered previously. The recognition and the nature of the ~2.2 Ga magmatic event in Liaodong Peninsula are critical for understanding the evolution of Jiao-Liao-Ji mobile belt. Our new data, coupled with recent studies on lithology, metamorphism, geochemistry, and geochronology of Archean-Paleoproterozoic basement rocks, support the Paleoproterozoic arc-continent collision model.

Key words: zircon LA-ICP-MS dating, ~2.2 Ga, magmatic event, Liaodong Peninsula, Jiao-Liao-Ji mobile belt, Liaoji granite, meta-volcanic rocks of Liaohe Group

CLC Number: 

  • P588.1

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