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Zircon U-Pb Dating of the Granodiorite-Porphyries in Jiejinkou-Fuyuan Area,Northeastern Heilongjiang Province and Its Geological Significance

Yu Jiejiang1, Liu Jiacheng1, Zhang Jiahui2, Ge Wenchun1, Hou Xuegang1   

  1. 1.College of Earth Sciences, Jilin University, Changchun130061, China;
    2.Resource Department, Liaoning Geology Engineering Vocational College, Dandong118008, Liaoning, China
  • Received:2013-01-13 Online:2013-09-26 Published:2013-09-26

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Abstract:

We report zircon U-Pb dating of the granodiorite-porphyries in Jiejinkou-Fuyuan area, northeastern Heilongjiang Province, with the aim of constraining formation time and tectonic setting of these granodiorite-porphyries. Most of the zircons from these granodiorite-porphyries are euhedral-subhedral in shape, display fine-scale oscillatory growth zoning, and have Th/U values of 0.31-1.23, indicating a magmatic origin. The dating results indicate that these granodiorite-porphyries formed in the Late Cretaceous (90.2-94.8 Ma) rather than previously believed Late Indo-Chinese epoch. Combined with the coeval igneous rock associations in the study area and adjacent areas and the subduction history of the Paleo-Pacific plate, we conclude that the Late Cretaceous granodiorite-porphyries in Jiejinkou-Fuyuan area, northeastern Heilongjiang Province occurred in the tectonic setting of the subduction of the Paleo-Pacific plate beneath the East Asia continent, and this magmatic event would mark the beginning of orthogonal subduction of the Paleo-Pacific plate.

Key words: granodiorite-porphyries, zircon U-Pb dating, isotopes, geological significance, northeastern Heilongjiang Province

CLC Number: 

  • P597
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