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Active tectonics and erosional unloading at the eastern margin of the Tibetan Plateau

Active tectonics and erosional unloading at the eastern margin of the Tibetan Plateau The eastern margin of the Tibetan Plateau is marked by an extremely steep mountain front with relief of over 5 km. This topography, coupled with abundant Mesozoic thrusts within the margin, explains why tectonic maps of the India-Asia collision typically show the eastern margin as a major thrust zone. Actually, it does not like that. Field observations suggest that the margin is better characterized as a zone of NNE-directed dextral shear with extensive strike-slip faulting and secondary thrusting. The high relief and steep gradients are partially explained by erosional unloading of an elastic lithosphere; the pre-erosion inherited topography may be the inherited Mesozoic thrust belt landscape modified by a component of Cenozoic tectonic shortening. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Mountain Science Springer Journals

Active tectonics and erosional unloading at the eastern margin of the Tibetan Plateau

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References (20)

Publisher
Springer Journals
Copyright
Copyright © Institute of Moutain Hazards and Environment, Chinese Academy of Sciences and Science Press 2005
ISSN
1672-6316
eISSN
1993-0321
DOI
10.1007/bf02918330
Publisher site
See Article on Publisher Site

Abstract

The eastern margin of the Tibetan Plateau is marked by an extremely steep mountain front with relief of over 5 km. This topography, coupled with abundant Mesozoic thrusts within the margin, explains why tectonic maps of the India-Asia collision typically show the eastern margin as a major thrust zone. Actually, it does not like that. Field observations suggest that the margin is better characterized as a zone of NNE-directed dextral shear with extensive strike-slip faulting and secondary thrusting. The high relief and steep gradients are partially explained by erosional unloading of an elastic lithosphere; the pre-erosion inherited topography may be the inherited Mesozoic thrust belt landscape modified by a component of Cenozoic tectonic shortening.

Journal

Journal of Mountain ScienceSpringer Journals

Published: Jun 1, 2005

Keywords: Tibetan Plateau; tectonic; erosional unloading; faulting

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