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Volume 27 Issue 5
Sep 2016
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Journal of Earth Science  > 2016  >  27(5): 864-873.
Yongjuan Gao, Wenli Ling, Xiaofei Qiu, Ziwan Chen, Shansong Lu, Xiao Bai, Xiujuan Bai, Junbo Zhang, Hongmei Yang, Ruichun Duan. Decoupled Ce-Nd isotopic systematics of the Neoproterozoic Huangling intrusive complex and its geological significance, eastern Three Gorges, South China. Journal of Earth Science, 2016, 27(5): 864-873. doi: 10.1007/s12583-016-0692-6
Citation: Yongjuan Gao, Wenli Ling, Xiaofei Qiu, Ziwan Chen, Shansong Lu, Xiao Bai, Xiujuan Bai, Junbo Zhang, Hongmei Yang, Ruichun Duan. Decoupled Ce-Nd isotopic systematics of the Neoproterozoic Huangling intrusive complex and its geological significance, eastern Three Gorges, South China. Journal of Earth Science, 2016, 27(5): 864-873. doi: 10.1007/s12583-016-0692-6
shu

Decoupled Ce-Nd isotopic systematics of the Neoproterozoic Huangling intrusive complex and its geological significance, eastern Three Gorges, South China

doi: 10.1007/s12583-016-0692-6
  • 1.

    Chengdu Institute of Geology and Mineral Resource, Chengdu, 610081, China

  • 2.

    State Key Laboratory of Geological Progresses and Mineral Resources, China University of Geosciences, Wuhan, 430074, China

  • 3.

    School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China

  • 4.

    Wuhan Center of Geological Survey, Wuhan, 430205, China

More Information
  • Corresponding author: Wenli Ling
  • Received Date: 17 Mar 2015
  • Accepted Date: 12 Jun 2015
  • Publish Date: 01 Oct 2016
    Abstract
  • Cerium is one of multivalent rear earth elements, which can transfer from trivalence to tretavalence at oxidizing environment. This process may cause variable degrees of fractionation of Ce from other trivalent rear earth elements, and thus may provide specific insight into the geological processes associated with marked redoxomorphism. Multiple geochemical tracing of Sr-Nd-Ce isotopes are performed on the felsic and mafic intrusives of the Neoproterozoic (~800 Ma) Huangling complex located at the eastern Three Gorges, South China. The intrusive rocks exclusively show various extents of negative Ce anomalies. On the εCe-εNd plot, most samples from the mafic intrusions scatter within the second quadrant, whereas those from the felsic intrusions within the fourth Quadrant. Both of the two groups exhibit relatively large range of εCe(t) variation but limited εNd(t) range, which cause a deviation from the "crustal array" and reveal a decoupled Nd-Ce isotope correlation. The intermediate-felsic suite have varied Ce/Ce* ratios but broadly proximate εCe(t) values, indicating that their negative Ce anomalies were generated during the magmatism; on the contrary, a positive correlation betweenεCe(t) and Ce/Ce* is observed for the intermediate-mafic suite, an indication of an origin of post-magmatic alteration or metamorphism for their Ce anomalies. Calculation of model age, the occurrence age of negative Ce anomalies (TCe) for the intermediate-mafic samples infers that the alteration events took place > 350 Ma. Data showed that negative Ce anomalies of the felsic intrusions may reflect an increase of oxygen fugacity during magma ascending, rather than an inheritance from their source rocks. This explanation implies that the Neoproterozoic magmatism occurred at the continental nucleus of the Yangtze block were developing at a geodynamic context of rapidly regional uplifting.

     

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