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Multistage Remobilization of the Southwestern Margin of the South China Plate: Insights From Zircon U‐Pb Geochronology and Hf Isotope of Granitic Rocks From the Yao Shan Complex, Southeastern Tibet Plateau

Tectonics (Washington, D.C.), 2019-02, Vol.38 (2), p.621-640 [Peer Reviewed Journal]

2019. American Geophysical Union. All Rights Reserved. ;ISSN: 0278-7407 ;EISSN: 1944-9194 ;DOI: 10.1029/2018TC005339

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  • Title:
    Multistage Remobilization of the Southwestern Margin of the South China Plate: Insights From Zircon U‐Pb Geochronology and Hf Isotope of Granitic Rocks From the Yao Shan Complex, Southeastern Tibet Plateau
  • Author: Chen, Xiaoyu ; Burg, Jean‐Pierre ; Liu, Junlai ; Qi, Yinchuan ; Fan, Wenkui ; Wang, Kai
  • Subjects: Ablation ; Ailao Shan‐Red River belt ; Basement rock ; Continental margins ; Cretaceous ; Deformation ; Dikes ; Embankments ; Evolution ; Geochronology ; Geochronometry ; Geological time ; Hf isotope analysis ; Igneous rocks ; Isotopes ; Lasers ; Lead ; Magma ; Mass spectrometry ; Mass spectroscopy ; Miocene ; multistage remobilization ; Oceanic crust ; Plate margins ; Plate tectonics ; Plutons ; Precambrian ; Rifting ; Rock ; Rocks ; Shear zone ; South China plate ; Subduction ; Tectonic processes ; Water analysis ; Yao Shan massif ; Zircon ; zircon U‐Pb geochronology
  • Is Part Of: Tectonics (Washington, D.C.), 2019-02, Vol.38 (2), p.621-640
  • Description: The Yao Shan complex, located at the southwestern margin of the South China plate, to the east of the Sanjiang‐Southeast Asia Tethyan domain, and at the northern extension of the Day Nui Con Voi massif of the Ailao Shan‐Red River shear zone, provides a reasonable example to study the multistage tectonic remobilization of continental plates. In this paper, we present new zircon LA‐ICP‐MS (Laser Ablation Inductively Coupled Plasma Mass Spectrometry) U‐Pb dating results and Hf isotopic data of the granitic plutons and dikes from the Yao Shan complex. Zircon U‐Pb ages of the granitic intrusions mainly concentrate on three periods: 825–780, 82–69, and 31–29 Ma. The zircons are characterized by mainly negative εHf(t) values with TDMC ages of 2637–1645, 1964–1610, and 2077–1400 Ma, respectively. The results show that the Yao Shan complex record evidences for three episodes of extensive partial melting of middle and lower crustal Precambrian crystalline basement rocks. They contributed to the granitic magmatism in relation to tectonic processes and structural deformation from Neoproterozoic, Late Cretaceous to Oligo‐Miocene. Therefore, we argue that the southwestern margin of the South China plate is the weakness for multistage remobilization throughout the tectonic evolution of the plate after its primary cratonization. Remobilization of the plate margin is related to oceanic plate subduction, triggered by rifting in a passive continental margin setting, induced by extension at back‐arc setting, or resulted from continental extrusion. Key Points The middle to lower crustal Precambrian crystalline rocks at Yao Shan experienced partial melting during three major tectonomagmatic events The southwestern margin of the South China plate was the weakness for multistage remobilization throughout its tectonic evolution The remobilization is related to oceanic plate subduction, passive continental margin rifting, back‐arc extension or tectonic extrusion
  • Publisher: Washington: Blackwell Publishing Ltd
  • Language: English
  • Identifier: ISSN: 0278-7407
    EISSN: 1944-9194
    DOI: 10.1029/2018TC005339
  • Source: Wiley Blackwell AGU Digital Library
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