Late Paleozoic Chingiz and Saur Arc Amalgamation in West Junggar (NW China): Implications for Accretionary Tectonics in the Southern Altaids - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Tectonics Année : 2020

Late Paleozoic Chingiz and Saur Arc Amalgamation in West Junggar (NW China): Implications for Accretionary Tectonics in the Southern Altaids

Shuaihua Song
  • Fonction : Auteur
Wenjiao Xiao
  • Fonction : Auteur
Brian F. Windley
  • Fonction : Auteur
A. S. Collins
  • Fonction : Auteur
Yichao Chen
  • Fonction : Auteur
Ji'En Zhang
  • Fonction : Auteur
Chunming Han
  • Fonction : Auteur
Bo Wan
  • Fonction : Auteur
Songjian Ao
  • Fonction : Auteur
Zhiyong Zhang
  • Fonction : Auteur
Dongfang Song
  • Fonction : Auteur
Rui Li
  • Fonction : Auteur

Résumé

The Saur-Chingiz Belt (SCB) in northern West Junggar is regarded as the amalgamation zone of the Saur and Chingiz arcs. It contains diagnostic rocks of accretionary origin, providing critical information about the evolution of the southern Paleo-Asian Ocean. We recognize various lithologies in the SCB, including an ophiolitic mélange, turbidites, conglomerates, rhyolites, breccias, and diorites, and investigate the structures of the Hebukesaier ophiolitic mélange. Kinematic analysis indicates top-to-the-N thrusting. A coarse-grained gabbro (ca. 490 Ma) and a fine-grained gabbro (ca. 318 Ma) have normal mid-ocean ridge basalt (N-MORB)-type geochemical signatures, and three groups of pillow basalts exhibit N-MORB, enriched mid-ocean ridge basalt (E-MORB), and ocean island basalts (OIB) fingerprints, respectively. Detrital zircons in tuffs, conglomerates, and turbidites associated with the Hebukesaier mélange display predominant ages of 410-440 Ma, which are consistent with the age of the Chingiz Arc. This suggests that the mafic rocks (ophiolitic components) in the Hebukesaier mélange were generated at a mid-ocean ridge and were later accreted to the Chingiz Arc, which formed above a southward-dipping subduction zone that consumed the Paleo-Asian Ocean. The predominant zircon age peaks of turbidites from the Saur area, north of the Hebukesaier mélange, range from 326 to 360 Ma, which areconsistent with a provenance from the Saur Arc. The distinctive detrital zircons of the Chingiz and Saur arcs indicate that the northern boundary of the Hebukesaier mélange is the tectonic boundary between the Chingiz and Saur arcs. We suggest that Paleo-Asian Ocean closed before Late Triassic as indicated by a diorite vein (ca. 218 Ma) that intruded the Hebukesaier mélange.
Fichier principal
Vignette du fichier
Tectonics - 2020 - Song - Late Paleozoic Chingiz and Saur Arc Amalgamation in West Junggar NW China Implications for.pdf (37.65 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

insu-03707757 , version 1 (01-07-2022)

Licence

Copyright (Tous droits réservés)

Identifiants

Citer

Shuaihua Song, Wenjiao Xiao, Brian F. Windley, A. S. Collins, Yichao Chen, et al.. Late Paleozoic Chingiz and Saur Arc Amalgamation in West Junggar (NW China): Implications for Accretionary Tectonics in the Southern Altaids. Tectonics, 2020, 39, ⟨10.1029/2019TC005781⟩. ⟨insu-03707757⟩
11 Consultations
8 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More