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Research ArticleArticles

Characterizing episodic orogenesis and magmatism in eastern China based on detrital zircon from the Jiaolai Basin

Rui Zhao, Qingfei Wang, Jun Deng, M. Santosh, Xuefei Liu, Yayun Liang and Hanyu Cheng
American Journal of Science June 2019, 319 (6) 500-525; DOI: https://doi.org/10.2475/06.2019.03
Rui Zhao
* State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, China
§ China Aero Geophysical Survey and Remote Sensing Center for Natural Resources, Beijing, 100083, China
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Qingfei Wang
* State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, China
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  • For correspondence: wqf@cugb.edu.cn
Jun Deng
* State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, China
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M. Santosh
* State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, China
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Xuefei Liu
* State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, China
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Yayun Liang
* State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, China
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Hanyu Cheng
* State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, China
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Abstract

The eastern China region is composed of the North China Craton (NCC) and the Yangtze Craton (YC), both of which underwent episodic orogenesis and magmatism. The Jiaolai extensional basin occurs at the southeastern boundary between the NCC and YC. Here we employ combined age and trace element data on detrital zircon grains in the Cretaceous Laiyang Group of the Jiaolai Basin to gain insights on magmatism and average melt compositions of the Archean to Cretaceous source rocks. Detrital zircon data suggest that the eastern China region was characterized by five main stages of crustal evolution and magmatism. The ∼2500 Ma detrital zircon population with positive εHf(t) values trace new crustal growth during the Archean. Most Paleoproterozoic zircon grains are characterized by negative εHf(t) values indicating reworking of the ancient crust. Additionally, the Y/Gd ratios indicate a thickened crust, and the low Ce/Ce* and Eu/Eu* values suggest low oxygen fugacity conditions of magmatism during this period. The Neoproterozoic zircon population displays low U/Yb ratios suggesting less input of slab fluid during juvenile crust generation along the western and northern margins of the YC. The Triassic zircon have high U/Yb and low Th/U ratios denoting extensive involvement of slab fluid and crustal metamorphism during the collision between the NCC and YC. The Th/Nb and Hf/Th ratios of Cretaceous detrital zircon grains are similar to those from arc-related/orogenic setting, and their Hf isotopes are consistent with melting of a composite crust with YC crust wedged into the NCC crust.

  • Jiaolai Basin
  • Laiyang Group
  • detrital zircon
  • orogenesis
  • magmatism
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American Journal of Science: 319 (6)
American Journal of Science
Vol. 319, Issue 6
1 Jun 2019
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Characterizing episodic orogenesis and magmatism in eastern China based on detrital zircon from the Jiaolai Basin
Rui Zhao, Qingfei Wang, Jun Deng, M. Santosh, Xuefei Liu, Yayun Liang, Hanyu Cheng
American Journal of Science Jun 2019, 319 (6) 500-525; DOI: 10.2475/06.2019.03

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Characterizing episodic orogenesis and magmatism in eastern China based on detrital zircon from the Jiaolai Basin
Rui Zhao, Qingfei Wang, Jun Deng, M. Santosh, Xuefei Liu, Yayun Liang, Hanyu Cheng
American Journal of Science Jun 2019, 319 (6) 500-525; DOI: 10.2475/06.2019.03
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Keywords

  • Jiaolai Basin
  • Laiyang Group
  • detrital zircon
  • orogenesis
  • magmatism

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