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; Dominique Cluzel; Michel Faure; Wei Lin; Bo Wang; Yan Chen; Fuyuan Wu; Wenbin Ji

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.

Document type :

Journal articles

Domain :

Sciences of the Universe [physics] / Earth Sciences / Tectonics

Environmental Sciences / Global Changes

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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.

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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.

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