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Geochronology,geochemistry and geodynamics implications of Middle Triassic garnet-bearing muscovite monzogranite in central Jilin Province
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  • 英文篇名:Geochronology,geochemistry and geodynamics implications of Middle Triassic garnet-bearing muscovite monzogranite in central Jilin Province
  • 作者:JIAO ; Ji ; JIA ; Haiming ; PEI ; Fuping ; ZHOU ; Hao ; ZHOU ; Zhongbiao ; ZHANG ; Ying ; XU ; Wenliang
  • 英文作者:JIAO Ji;JIA Haiming;PEI Fuping;ZHOU Hao;ZHOU Zhongbiao;ZHANG Ying;XU Wenliang;College of Earth Sciences,Jilin University;Geological Survey Institute of Jilin Province;
  • 英文关键词:central Jilin Province;;muscovite granite;;thickened continental crust;;Middle Triassic
  • 中文刊名:DBYD
  • 英文刊名:世界地质(英文版)
  • 机构:College of Earth Sciences,Jilin University;Geological Survey Institute of Jilin Province;
  • 出版日期:2018-09-25
  • 出版单位:Global Geology
  • 年:2018
  • 期:v.21
  • 基金:Supported by National Basic Research Program of China(No.41572043)
  • 语种:英文;
  • 页:DBYD201803001
  • 页数:15
  • CN:03
  • ISSN:22-1371/P
  • 分类号:3-17
摘要
Zircon LA-ICP-MS U-Pb geochronology and geochemical analyses are undertaken for the garnet-bearing muscovite monzogranite in Yitong area,central Jilin Province. The formation age and petrogenesis of the granite are determined,and the regional tectonic background is discussed. Zircons from the granite are euhedral-subhedral in shape,and display fine-scale oscillatory growth zoning,indicating a magmatic origin. LAICP-MS zircon U-Pb dating result indicates that the garnet-bearing muscovite monzogranites formed in the middle Triassic( 243 Ma). The garnet-bearing muscovite monzogranites have high SiO_2( Si O2= 74. 1%--76. 49%),rich aluminum( Al_2O_3= 14. 47%--14. 68%) and alkali( Na_2O + K_2O = 4. 31%--7. 9%),low Fe_2O_3 T and MgO( MgO = 0. 1%--0. 13%,Fe_2O_3 T = 0. 46%--1. 02%). The ratio of CaO/Na_2O is between 0. 17--0. 21. The garnet-bearing muscovite monzogranites in Yitong region are relatively enriched in light rare earth elements( LREEs) and large ion lithophile elements( LILEs),and depleted of heavy rare earth elements( HREEs) and high field strength elements( HFSEs). They are characterized by high Sr and Ba,poor Rb and Y,and negative Eu abnormally( δEu = 0. 48--0. 62),with Rb/Sr < 1. The ε_(Hf)( t) values and T_(DM2) of zircons range from + 6. 10 to + 8. 00 and from 725 Ma to 814 Ma,respectively. The above features indicate that garnet-bearing muscovite monzogranites in Yitong area were derived from partial melting of metasedimentary rock.These granites have high Sr/Y ratios,which suggest they formed in a thickened continental crust. Combined with the coeval granitic rocks in central Jilin Province,we suggested that a significant collisional and thickening event took place during the Middle Triassic.
        Zircon LA-ICP-MS U-Pb geochronology and geochemical analyses are undertaken for the garnet-bearing muscovite monzogranite in Yitong area,central Jilin Province. The formation age and petrogenesis of the granite are determined,and the regional tectonic background is discussed. Zircons from the granite are euhedral-subhedral in shape,and display fine-scale oscillatory growth zoning,indicating a magmatic origin. LAICP-MS zircon U-Pb dating result indicates that the garnet-bearing muscovite monzogranites formed in the middle Triassic( 243 Ma). The garnet-bearing muscovite monzogranites have high SiO_2( Si O2= 74. 1%--76. 49%),rich aluminum( Al_2O_3= 14. 47%--14. 68%) and alkali( Na_2O + K_2O = 4. 31%--7. 9%),low Fe_2O_3 T and MgO( MgO = 0. 1%--0. 13%,Fe_2O_3 T = 0. 46%--1. 02%). The ratio of CaO/Na_2O is between 0. 17--0. 21. The garnet-bearing muscovite monzogranites in Yitong region are relatively enriched in light rare earth elements( LREEs) and large ion lithophile elements( LILEs),and depleted of heavy rare earth elements( HREEs) and high field strength elements( HFSEs). They are characterized by high Sr and Ba,poor Rb and Y,and negative Eu abnormally( δEu = 0. 48--0. 62),with Rb/Sr < 1. The ε_(Hf)( t) values and T_(DM2) of zircons range from + 6. 10 to + 8. 00 and from 725 Ma to 814 Ma,respectively. The above features indicate that garnet-bearing muscovite monzogranites in Yitong area were derived from partial melting of metasedimentary rock.These granites have high Sr/Y ratios,which suggest they formed in a thickened continental crust. Combined with the coeval granitic rocks in central Jilin Province,we suggested that a significant collisional and thickening event took place during the Middle Triassic.
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