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Accommodation du mouvement relatif entre l'Inde et la Sonde depuis la faille de Sagaing (Birmanie) jusqu'à la Syntaxe Est Himalayenne

Abstract : The present-day accommodation of the relative motion between India and Sunda blocks and the deformation mode evolution since Cenozoic are explored in this memoir. To investigate these issues, I used a multidisciplinary approach, based on the combination of spatial geodesy and structural geology. GPS (Global Positioning System) quantifies relative plates motions as well as intra-continental displacements. Mapping of faults from satellite imagery and structural field data allow to identify tectonic structures accommodating these motions through time, and to define their associated deformation mode. Rotation poles of India and Sunda plates were better constrained. Their relative motion at the border is not accommodated on one single fault, but rather on many discrete structures cutting through a 500 km wide band, corresponding geographically to Myanmar. The Sagaing fault, interseismically locked, moves at only 18 mm/yr by right-lateral slip. The remaining motion is probably taken within the indo-burmese wedge, both by strike-slip and thrust. To the north, the partitionned Myanmar system connects to the Eastern Himalayan Syntaxis. Transition between these two systems is accommodated, since Pliocene in Western Yunnan (China), by rotation of micro-blocs sliding against left-lateral NE-trending faults. In earlier time, between Eocene and Miocene, the Shan Scarp - Gaoligong Shan shear zone constituted the main right-lateral boundary between India and Indochina, whereas the Ailao / Diangcan Shan ranges were sheared left-laterally, allowing a southeastward displacement of Indochina block.
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https://tel.archives-ouvertes.fr/tel-00006110
Contributor : Anne Socquet <>
Submitted on : Monday, May 17, 2004 - 4:50:01 PM
Last modification on : Wednesday, September 16, 2020 - 4:53:45 PM
Long-term archiving on: : Friday, April 2, 2010 - 8:33:21 PM

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  • HAL Id : tel-00006110, version 1

Citation

Anne Socquet. Accommodation du mouvement relatif entre l'Inde et la Sonde depuis la faille de Sagaing (Birmanie) jusqu'à la Syntaxe Est Himalayenne. Géologie appliquée. Migration - université en cours d'affectation, 2003. Français. ⟨tel-00006110v1⟩

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