Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (1): 139-153.doi: 10.13278/j.cnki.jjuese.201701113

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The Timing of the Formation and Exhumation of the Dawu Complex in West Dabie Orogen, East China, and Its Geological Significance

Cui Jianjun1, Wang Yanhong2, Zheng Guanggao1, Shi Wei1, Ma Licheng1   

  1. 1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;
    2. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
  • Received:2016-10-17 Online:2017-01-26 Published:2017-01-26
  • Supported by:
    Supported by the National Science and Technology Project (SinoProbe-08-01):Basic Scientific Research Fund from Institute of Geomechanics (DZLXJK201302)

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Abstract: Dawu complex is located in the western part of the Dabie orogenic belt. The complex is mainly composed of gneissic granite. To constrain the timing of the formation and deformation processes of the complex, a set of integrated zircon U-Pb and muscovite 40Ar-39Ar dating were carried out. The conducted zircon U-Pb LA-ICP-MS isotopic dating of the gneissic granites from the complex showed Th/U ratios in the range of 0.79-4.29 indicating the zircon is a typical magmatic mineral. The weighted mean 206Pb/238U age is(810±63)Ma (n=12, MSWD=0.021), which is considered to be the formation age of the gneiss. The 40Ar/39Ar dating of muscovite from the gneissic granites in the central part of Dawu complex yields a plateau age of (210.5±1.4) Ma and an isochron age of (211.6±2.5) Ma. The new dating results support that:(1) The strongly deformed magmatic rocks in the Dawu complex were formed in the Neoproterozoic rather than Cretaceous, (2) Large scale crustal deformation and exhumation of the Precambrian rocks mainly occurred in Late Triassic (211 Ma). Since the Late Triassic tectonic processes were related to exhumation of the HP-UHP metamorphic rocks in western Dabie orogen, it is worth investigating the relationship between the formation of the Dawu complex and the exhumation of the HP-UHP metamorphic rock in the study area. Meanwhile, most of the foliations and lineations in the Dawu complex formed after the regional HP-UHP metamorphism, we therefore infer that the Late Triassic deformation occurred in the geodynamic settings of late to post-orogeny, and might be accompanied by large scale crustal extension and lithospheric thinning.

Key words: Dawu complex, gneissic granites, zircon U-Pb dating, 40Ar-39Ar dating, crustal deformation

CLC Number: 

  • P588.1
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