New constraints on the pre-Permian continental crust growth of Central Asia (West Junggar, China) by U-Pb and Hf isotopic data from detrital zircon.

Flavien Choulet 1, * Dominique Cluzel 2 Michel Faure 1 Wei Lin 3 Bo Wang 4 Yan Chen 1 Fuyuan Wu 3 Wenbin Ji 3
* Corresponding author
1 ISTO - Institut des Sciences de la Terre d'Orléans
2 PPME - EA-3325 - Pôle Pluridisciplinaire de la Matière er de l'Environnement
3 SKL - State Key Laboratory of Lithospheric Evolution
4 Department of Earth Sciences [Nanjing]
Abstract : In-situ U-Pb geochronology of detrital zircons from various Palaeozoic sedimentary rocks of West Junggar accretionary complexes (Central Asia) suggests two distinct episodes of arc magmatism, and an evolution in three steps: i) Ordovician-Silurian subduction generating juvenile arc crust; ii) Late Silurian subduction jamming, erosion and intraplate magmatism, iii) development of two new opposed Devonian-Carboniferous subductions recycling the Early Palaeozoic crust. Zircon Hf isotopes document three pre-Permian episodes of mantle-derived magmatic input into the crust: 1) Neoproterozoic (850-550 Ma), 2) Early Palaeozoic (530-450 Ma) and 3) Late Palaeozoic (380-320 Ma). Zircons also record the recycling of Neoproterozoic and Early Palaeozoic juvenile crusts during the Early and Late Palaeozoic. These data support a model of episodic continental crust growth in Central Asia.
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Flavien Choulet, Dominique Cluzel, Michel Faure, Wei Lin, Bo Wang, et al.. New constraints on the pre-Permian continental crust growth of Central Asia (West Junggar, China) by U-Pb and Hf isotopic data from detrital zircon.. Terra Nova, Wiley-Blackwell, 2012, 24 (3), pp.189-198. ⟨10.1111/j.1365-3121.2011.01052.x⟩. ⟨insu-00648790⟩

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