Journal of Jilin University(Earth Science Edition) ›› 2022, Vol. 52 ›› Issue (6): 1907-1925.doi: 10.13278/j.cnki.jjuese.20210173

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Geochronology, Geochemistry and Geological Significance of the Middle Jurassic Porphyritic Monzogranite in the Southern Zhangguangcai Range, Heilongjiang Province

Zhang Guobin1, Chen Xingkai1, Zhao Yue1,2, Tang Jiayu1, Li Ruirui3, Feng Yue1, Kong Jingui1   

  1. 1. Mining Institute, Liaoning Technical University, Fuxin 123000, Liaoning, China
    2. Institute of Innovation and Development for Fuxin Transition, Liaoning Technical University, Fuxin 123000, Liaonig, China
    3. Chemical Geological Prospecting Institute of Liaoning Province Co.,Ltd., Jinzhou 121007, Liaoning, China
  • Received:2021-06-15 Online:2022-11-26 Published:2022-12-27
  • Supported by:
    the Projectof China Geological Survey (1212011120342), the Fund of the Department of Science and Technology of Liaoning Province (20170540428,201601370) and the Educational Department of Liaoning Province (LJ2019JL027)

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Abstract: Zhangguangcai Range is located in the central-southern part of Heilongjiang Province and the central part of Jilin Province. The north-south magmatic arcs developed in the Zhangguangcai Range are the products of collision-collage of microplates, which can effectively determine the collision-collage age of Songnen block and Jimusi block. In this paper, systematic zircon U-Pb geochronology and petrogeochemistry of the Middle Jurassic porphyritic monzogranites in Qingsong, Southern Zhangguangcai Range, have been carried out to explore its geological significance. The zircon U-Pb geochronology shows that the petrogenic ages of porphyritic medium-fine grained monzogranites and porphyritic medium-coarse grained monzogranites are (172.1±1.3) Ma and 172.1-172.4 Ma respectively, indicating their diagenetic ages belong to the Middle Jurassic. Geochemical results indicate that the porphyritic monzogranites are low in Si and Al, high in alkali, K and TFeO/MgO values. The chondrite-normalized REE patterns of porphyritic monzogranites with a slight dipping to the right display enrichment in elements of (Rb, K,  U, Th, La and LREE and depletion in elements of Nb, P, Ti, Y, Yb, Lu and HREE The porphyritic monzogranites belong to type I granites, and their magma originatesd from the crust-mantle mixed source area. Combined with the characteristics of chronology and geochemistry, the Middle Jurassic porphyritic monzogranites were formed in the syncollisional tectonic setting, which is closely related to the collision-collage of the Jiamusi block and the Songnen block.

Key words: Southern Zhangguangcai Range, monzogranite, zircon U-Pb dating, geochemistry, petrogenesis, tectonic setting

CLC Number: 

  • P588.1
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