Article Dans Une Revue Gondwana Research Année : 2023

From early Paleozoic subduction to end-Carboniferous post-orogenic collapse: New constraints on the tectonic evolution of the Central and South Tianshan (NW China)

Fang Song
  • Fonction : Auteur
Bo Wang
Xinghua Ni
  • Fonction : Auteur
Mohamed Abu Anbar
  • Fonction : Auteur
Tingting Cao
  • Fonction : Auteur
Yiyi Chen
  • Fonction : Auteur
Yuxin Sun
  • Fonction : Auteur
Hongsheng Liu
  • Fonction : Auteur

Résumé

Recognition of extensional events of orogenic belts is critical for reconstructing convergent orogenesis and its geodynamic evolution, but is also challenging due to multi-stage tectonic superimposition. The South Tianshan is the southern margin of the Paleozoic Central Asian Orogenic Belt (CAOB) and the key for understanding the geodynamic evolution of the CAOB. Here we present new comprehensive structural, geochronological and geochemical data for the Paleozoic sedimentary, igneous and metamorphic rocks in the Central and South Tianshan (NW China). Based on our new results and published data, we suggest that a neritic to terrestrial backarc basin existed to the south of the Central Tianshan magmatic arc during the Early-Middle Devonian. We document a crustal anatectic event (~304 Ma migmatization) associated with peraluminous granitic magmatism (~305-295 Ma) in the South Tianshan. Multi-stage ductiledeformation events witnessed the Paleozoic evolution from subduction-accretion to post-orogenic collapse of the Tianshan Orogen: (1) Late Devonian-Carboniferous regional top-to-the-north ductile shearing is related to the southward subduction of the South Tianshan back-arc basin; (2) late Carboniferous south-verging folds and brittle-ductile axial-plane cleavages correspond to back-thrusting resulted from the collision between Central Tianshan and Tarim; (3) E-W-trending ductile normal faults developed in migmatites are linked with syn-anatectic exhumation of the middle crust during the latest Carboniferous post-collisional extension; and (4) regional dextral strike-slip faulting attributed to Permian lateral extrusion. Therein, two stages of crustal extension are key puzzle pieces to reconstruct the accretionary orogenic processes of the Paleozoic Tianshan.
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hal-04362974 , version 1 (23-12-2023)

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Fang Song, Bo Wang, Xinghua Ni, Mohamed Abu Anbar, Yan Chen, et al.. From early Paleozoic subduction to end-Carboniferous post-orogenic collapse: New constraints on the tectonic evolution of the Central and South Tianshan (NW China). Gondwana Research, In press, 129, pp.305-331. ⟨10.1016/j.gr.2024.01.001⟩. ⟨hal-04362974⟩
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