EGU2020-1523
https://doi.org/10.5194/egusphere-egu2020-1523
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

India-Asia collision paleogeography constrained by Burma Terrane (Myanmar) Late Cretaceous to Miocene paleomagnetic data

Jan Westerweel1, Pierrick Roperch1, Alexis Licht2, Guillaume Dupont-Nivet1,3, Zaw Win4, Fernando Poblete1,5, Nathan Cogné1, Gilles Ruffet1, Huasheng Huang6, Hnin Hnin Swe7, Myat Kai Thi7, Carina Hoorn6, and Day Wa Aung7
Jan Westerweel et al.
  • 1CNRS, Geosciences Rennes, Université de Rennes 1, Rennes CEDEX, France (jan.westerweel@univ-rennes1.fr)
  • 2Dept. Earth and Space Sciences, University of Washington, Seattle, United States
  • 3Department of Geociences, Potsdam University, Potsdam, Germany
  • 4Department of Geology, University of Shwebo, Shwebo, Myanmar
  • 5Departamento de Geología, Universidad de Chile, Santiago, Chile
  • 6University of Amsterdam, Amsterdam, The Netherlands
  • 7Department of Geology, University of Yangon, Yangon, Myanmar

The paleogeographic evolution of the India-Asia collision and the resulting formation of the Himalayan orogen remain an intensely debated topic. A variety of disputed models propose different collision ages for the numerous terranes incorporated into the collision with variable paleolatitudes and tectonic rotations that can be constrained using paleomagnetism. Recent plate tectonic reconstructions have shown that the Burma Terrane (BT), a microplate at the eastern edge of the Himalayan orogen, is a key element to solve the India-Asia collision puzzle. Here we provide new paleomagnetic and geochronological data of Paleocene, Eocene, Oligocene and Miocene age, in addition to our previously published Late Cretaceous and late Eocene results. We present a robust plate tectonic reconstruction for the BT with GPlates software, and show that the BT moved towards southern hemisphere latitudes between the Late Cretaceous and Paleocene without significant rotation. Starting in the Paleocene, the BT and India coevally moved northwards and the BT started to undergo a major clockwise rotation of ~60 ̊. By the late Eocene, most of this rotation was completed and the BT was translated ~2000 km northward from near-equatorial latitudes without significant rotation. This northward translation culminated with the early Miocene indentation of the BT into the eastern Himalayan collision zone, leading to the setup of the modern Eastern Himalayan Syntaxis. These first order constraints are used to infer a Trans-Tethyan arc collision model including timing of rollback, extrusion and initiation of strike-slip systems. Our model has important implications for Asian biotic and climatic evolution.

How to cite: Westerweel, J., Roperch, P., Licht, A., Dupont-Nivet, G., Win, Z., Poblete, F., Cogné, N., Ruffet, G., Huang, H., Swe, H. H., Thi, M. K., Hoorn, C., and Aung, D. W.: India-Asia collision paleogeography constrained by Burma Terrane (Myanmar) Late Cretaceous to Miocene paleomagnetic data, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-1523, https://doi.org/10.5194/egusphere-egu2020-1523, 2019

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Presentation version 2 – uploaded on 01 May 2020
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  • CC1: Comment on EGU2020-1523, Xiaomin Fang, 07 May 2020

    Excellent work!  If telling how the Yalu-Zangbu River and Yangtze River re-settings are put into this tectonic evolution framework, it would be very informative and significant for thinking many other related questions.

    • AC1: Reply to CC1, Jan Westerweel, 07 May 2020

      Thank you for your positive response! Indeed I also think that our model has implications for the evolution of drainage systems in the Eastern Himalayas. One hypothesis is that (uplifts of) the Trans-Tethyan Arc system colliding with Asia north of the Burma Terrane could have acted as source regions for the sediments in Myanmar. 

Presentation version 1 – uploaded on 01 May 2020 , no comments