Journal
LITHOS
Volume 245, Issue -, Pages 7-17Publisher
ELSEVIER
DOI: 10.1016/j.lithos.2015.06.023
Keywords
Multidisciplinary data; Divergent double subduction; Bangong Ocean; Soft Lhasa-Qiangtang collision; Central Tibet
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Funding
- Strategic Priority Research Program (B) of the Chinese Academy of Sciences [XDB03010301]
- National Key Project for Basic Research of China [2011CB403102, 2015CB452604]
- National Natural Science Foundation of China [41225006, 41472061, 40973026]
- Specialized Research Fund for the Doctoral Program of Higher Education [20120022110001]
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Integration of lithostratigraphic, magmatic, and metamorphic data from the Lhasa-Qiangtang collision zone in central Tibet (including the Bangong suture zone and adjacent regions of the Lhasa and Qiangtang terranes) indicates assembly through divergent double sided subduction. This collision zone is characterized by the absence of Early Cretaceous high-grade metamorphic rocks and the presence of extensive magmatism with enhanced mantle contributions at ca. 120-110 Ma. Two Jurassic-Cretaceous magmatic arcs are identified from the Caima-Duobuza-Rongma-Kangqiong-Amdo magmatic belt in the western Qiangtang Terrane and from the Along Tso-Yanhu-Daguo-Baingoin-Daru Tso magmatic belt in the northern Lhasa Terrane. These two magmatic arcs reflect northward and southward subduction of the Bangong Ocean lithosphere, respectively. Available multidisciplinary data reconcile that the Bangong Ocean may have closed during the Late Jurassic-Early Cretaceous (most likely ca. 140-130 Ma) through arc-arc soft collision rather than continent-continent hard collision. Subduction zone retreat associated with convergence beneath the Lhasa Terrane may have driven its rifting and separation from the northern margin of Gondwana leading to its accretion within Asia. (C) 2015 Elsevier B.V. All rights reserved.
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