Detrital zircon U–Pb ages along the Yarlung-Tsangpo suture zone, Tibet: Implications for oblique convergence and collision between India and Asia

Aitchison, Jonathan C., Xia, Xiaoping, Baxter, Alan T. and Ali, Jason R. (2011) Detrital zircon U–Pb ages along the Yarlung-Tsangpo suture zone, Tibet: Implications for oblique convergence and collision between India and Asia. Gondwana Research, 20 4: 691-709. doi:10.1016/j.gr.2011.04.002


Author Aitchison, Jonathan C.
Xia, Xiaoping
Baxter, Alan T.
Ali, Jason R.
Title Detrital zircon U–Pb ages along the Yarlung-Tsangpo suture zone, Tibet: Implications for oblique convergence and collision between India and Asia
Journal name Gondwana Research   Check publisher's open access policy
ISSN 1342-937X
Publication date 2011-01-01
Year available 2011
Sub-type Article (original research)
DOI 10.1016/j.gr.2011.04.002
Open Access Status Not yet assessed
Volume 20
Issue 4
Start page 691
End page 709
Total pages 19
Place of publication Amsterdam, The Netherlands
Publisher Elsevier
Language eng
Formatted abstract
Age-dating of detrital zircons from 22 samples collected along, and adjacent to, the Yarlung-Tsangpo suture zone, southern Tibet provides distinctive age-spectra that characterize important tectonostratigraphic units. Comparisons with data from Nepal, northern India and the Lhasa and Qiangtang terranes of central Tibet constrain possible sources of sediment, and the history of tectonic interactions.Sedimentary rocks in the Cretaceous-Paleogene Xigaze terrane exhibit strong Mesozoic detrital zircon peaks (120 and 170. Ma) together with considerable older inheritance in conglomeratic units. This forearc basin succession developed in association with a continental volcanic arc hinterland in response to Neotethyan subduction under the southern edge of the Eurasia. Conspicuous sediment/source hinterland mismatches suggest that plate convergence along this continental margin was oblique during the Late Cretaceous. The forearc region may have been translated >. 500 km dextrally from an original location nearer to Myanmar.Tethyan Himalayan sediments on the other side of the Yarlung-Tsangpo suture zone reveal similar older inheritance and although Cretaceous sediments formed 1000s of km and across at least one plate boundary from those in the Xigaze terrane they too contain an appreciable mid-Early Cretaceous (123. Ma) component. In this case it is attributed to volcanism associated with Gondwana breakup.Sedimentary overlap assemblages reveal interactions between colliding terranes. Paleocene Liuqu conglomerates contain a cryptic record of Late Jurassic and Cretaceous rock units that appear to have foundered during a Paleocene collision event prior the main India-Asia collision. Detrital zircons as young as 37. Ma from the upper Oligocene post-collisional Gangrinboche conglomerates indicate that subduction-related convergent margin magmatism continued through until at least Middle and probably Late Eocene along the southern margin of Eurasia (Lhasa terrane).Although the ages of detrital zircons in some units appear compatible with more than one potential source with care other geological relationships can be used to further constrain some linkages and eliminate others. The results document various ocean closure and collision events and when combined with other geological information this new dataset permits a more refined understanding of the time-space evolution of the Cenozoic India-Asia collision system.
Keyword Cretaceous Paleogene
Detrital zircon provenance
India Asia collision
Oblique Convergence
Yarlung Tsangpo suture zone
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID HKU 7001/04P
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Geography, Planning and Environmental Management Publications
 
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Created: Wed, 29 Jul 2015, 20:20:53 EST by Helen Smith on behalf of School of Geography, Planning & Env Management