Burma Terrane part of the Trans-Tethyan arc during collision with India according to palaeomagnetic data - Archive ouverte HAL Access content directly
Journal Articles Nature Geoscience Year : 2019

Burma Terrane part of the Trans-Tethyan arc during collision with India according to palaeomagnetic data

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Jan Westerweel
  • Function : Correspondent author
Pierrick Roperch
Alexis Licht
Guillaume Dupont-Nivet
Zaw Win
  • Function : Author
Gilles Ruffet
Day Wa Aung
  • Function : Author

Abstract

Convergence between the Indian and Asian plates has reshaped large parts of Asia, changing regional climate and biodiversity, yet geodynamic models fundamentally diverge on how convergence was accommodated since the India–Asia collision. Here we report palaeomagnetic data from the Burma Terrane, which is at the eastern edge of the collision zone and is famous for its Cretaceous amber biota, to better determine the evolution of the India–Asia collision. The Burma Terrane was part of a Trans-Tethyan island arc and stood at a near-equatorial southern latitude at ~95 Ma, suggesting island endemism for the Burmese amber biota. The Burma Terrane underwent significant clockwise rotation between ~80 and 50 Ma, causing its subduction margin to become hyper-oblique. Subsequently, it was translated northward on the Indian Plate by an exceptional distance of at least 2,000 km along a dextral strike-slip fault system in the east. Our reconstructions are only compatible with geodynamic models involving an initial collision of India with a near-equatorial Trans-Tethyan subduction system at ~60 Ma, followed by a later collision with the Asian margin.
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Dates and versions

insu-02283010 , version 1 (16-11-2020)

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Jan Westerweel, Pierrick Roperch, Alexis Licht, Guillaume Dupont-Nivet, Zaw Win, et al.. Burma Terrane part of the Trans-Tethyan arc during collision with India according to palaeomagnetic data. Nature Geoscience, 2019, 12 (10), pp.863-868. ⟨10.1038/s41561-019-0443-2⟩. ⟨insu-02283010⟩
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