The timing of collision between Asia and the West Burma Terrane, and the development of the Indo-Burma Ranges

Najman, Yani and Sobel, Edward R. and Millar, Ian and Luan, Xiwu and Zapata, Sebastian and Garzanti, Eduardo and Parra, Mauricio and Vezzoli, Giovanni and Zhang, Peng and Aung, Day Wa and Paw, Saw Mu and Lwin, Thae (2022) The timing of collision between Asia and the West Burma Terrane, and the development of the Indo-Burma Ranges. Tectonics, 41: e2021TC007. ISSN 0278-7407

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The West Burma Terrane (WBT) is a small terrane bounded to the east by the Asian Sibumasu Block and to the west by the Indo-Burman Ranges (IBR), the latter being an exhumed accretionary prism that formed during subduction of Indian oceanic lithosphere beneath Asia. Understanding the geological history of the WBT is important for reconstruction of the closure history of the Tethys ocean and India-Asia collision. Currently there are major discrepancies in the proposed timings of collision between the WBT with both India and Asia; whether the WBT collided with India or Asia first is debated, and proposed timings of collisions stretch from the Mesozoic to the Cenozoic. We undertook a multi-technique provenance study involving petrography, detrital zircon U-Pb and Hf analyses, rutile U-Pb analyses and Sr-Nd bulk rock analyses on sediments of the Central Myanmar Basins (CMB) of the WBT. We determined that the first arrival of Asian material into the basin occurred after the earliest late Eocene and by the early Oligocene, thus placing a minimum constraint on the timing of WBT-Asia collision. Our low temperature thermochronological study of the IBR record two periods of exhumation, in the early-middle Eocene, and at the Oligo-Miocene boundary. The Eocene event may be associated with the collision of the WBT with India. The later event at the Oligo-Miocene boundary may be associated with changes in wedge dynamics resulting from increased sediment supply to the system; however a number of other possible causes provide equally plausible explanations for both events.

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This is the peer reviewed version of the following article: Najman, Y., Sobel, E. R., Millar, I., Luan, X., Zapata, S., Garzanti, E., et al. (2022). The timing of collision between Asia and the West Burma Terrane, and the development of the Indo-Burman Ranges. Tectonics, 41, e2021TC007057. doi: 10.1029/2021TC007057 which has been published in final form at This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
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?? central myanmar basinindo-burman rangeslow temperature thermochronologydetrital provenancewest burma terranegeochemistry and petrologygeophysics ??
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06 Jun 2022 10:05
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23 Mar 2024 01:04