Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (2): 429-441.doi: 10.13278/j.cnki.jjuese.20190214

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Geochemical, Zircon U-Pb Age, Hf Isotope and Geological Significance of Early Cretaceous Granite-Porphyry in Shimiaogou Area, Eastern Part of Liaoning Province

Wang Shicheng1, Yang Zhongjie2, Yang Ju3, Zhang Jing4, Sun Shouliang4, Liu Changchun2   

  1. 1. No. 243 Geological Party, China National Nuclear Corporation, Chifeng 024000, Inner Mongolia, China;
    2. Liaoning Survey Academy Limited Liability Company of Geology and Mineral Resources, Shenyang 110031, China;
    3. Regional Geological Survey of Hebei Province, Langfang 065000, Hebei, China;
    4. Shenyang Center, China Geological Survey, Shenyang 110034, China
  • Received:2019-10-08 Published:2021-04-06
  • Supported by:
    Supported by the Project of China Geological Survey(DD20160049)

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Abstract: The Shimiaogou area in Liaodong is tectonically located in the Liao-Ji orogenic/active belt in the eastern part of the North China block,which has experienced a very complex tectonic evolution with multiple magma-tectono-metamorphic events. The Shimiaogou rock mass is of granite porphyry,rich in SiO2,Na2O, and K2O,poor in CaO, MgO, and Al2O3; It lacks high field strength elements (Nb, Ti,Ta and P) but is rich in large ion lithophile elements(K, Rb, Ba, U) with A/CNK values greater than 1; The REE distribution curve shows"seagull"type, characterized by significant negative Eu anomaly,and Ga/Al value is consistent with the typical characteristics of type A granite. The granite-porphyry magmatic zircon LA-MC-ICP-MS U-Pb dating results show that its rock age was (123.0±1.6) Ma in the Early Cretaceous. Through Hf isotope analysis,the εHf(t) values are between -15.72 and -12.85 with the average of -14.14 and the two stage model age(TDM2) is between 2 164 and 1 989 Ma with an average of 2 067 Ma,reflecting the main continental crust composition of the source rock. Furthermore, combined with the characteristics of high SiO2,low Mg,Co,Cr,Ni, enrichment of LREE and LILE and loss of HFSE,it is suggested that the Early Cretaceous granite porphyry magma should be the melting product of continental crust material formed under the subduction of the Pacific plate beneath the Eurasian plate in the active continental margin. The Early Cretaceous environment of Liaodong region is affected by the subduction post-tectonic extension and lower crust delamination. The formation of the Early Cretaceous granite porphyry is controlled by Pacific tectonic domain,the dynamic environment formed in the lithosphere stretching is a direct evidence of lithospheric thinning in Liaodong area.

Key words: Early Cretaceous, granite porphyry, rock geochemical, zircon U-Pb age, Hf isotope, Shimiaogou area,the eastern part of Liaoning Province

CLC Number: 

  • P588.12
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