Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (2): 404-416.doi: 10.13278/j.cnki.jjuese.201502106

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U-Pb Geochronology of Detrital Zircon and the Constraint of Geochemistry from the Gegen'aobao Formation in Middle of Zalantun Area of Da Hinggan Mountains and Its Tectonic Significance

Zhang Yujin1,2, Wu Xinwei1,2, Jiang Bin1,2, Guo Wei1,2, Yang Yajun2, Liu Shiwei2, Cui Tianri2, Li Wei2, Li Linchuan2, Si Qiuliang2, Zhang Chao2   

  1. 1. College of Earth Sciences, Jilin University, Changchun 130061, China;
    2. Shenyang Institute of Geology and Mineral Resources/Shenyang Center of Geological Survey, China Geological Survey, Shenyang 110034, China
  • Received:2014-06-06 Published:2015-03-26

Abstract:

The Gegen'aobao Formation is widely exposed in the middle of Da Hinggan area. It is a combination of neutral partial volcanic and clastic rocks with main composition of andesite, andesitic pyroclastic rocks, dacite, fine-siltstone, and thin mudstone. We obtained the age of fine grained clastic rock in Gegen'aobao Formation by means of LA-ICP MS zircon U-Pb dating; and also discussed the paleontology stratigraphy of Gegen'aobao Formation. The results show that the fine clastic rock was formed in Late Carboniferous to Early Permian. Four main ages were observed, 348.9, 385.8, 428.0 and 507.3 Ma. Several fossils like Artisia sp., Eusigillaris sp. were found in siltstone. Fine-grained greywacke and feldspathic greywacke (debris) sandstones are the major clastic rocks in the Gegen'aobao Formation. The average bulk chemical composition of these rocks is SiO2 69.04%, Al2O3 14.76%, MgO 1.05%, CaO 0.66%, Na2O 2.34%, and K2O 2.65% in weight. Mg/Al ratio (M) is 3.05 to 9.98, with an average value of 7.18. The total weight of REE (∑REE) ranges from 124.06×10-6 to 261.96×10-6 with the average value of 184.46×10-6. The value for δEu and δCe are 0.71 and 0.99 respectively. The clastic rocks are characterized by LREE enrichment and HREE depletion. These results indicate that Gegen'aobao Formation was formed between the continental island arc and the active continental margin, under a warm and humid paleoclimate condition.

Key words: Gegen'aobao Formation, detrital zircons, geochemistry, provenance analysis, Zalantun area, Middle Part of the Da Hinggan Mountains

CLC Number: 

  • P59

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