Use of a regional, relict landscape to measure vertical deformation of the eastern Tibetan Plateau

Marin K. Clark, L. H. Royden, Kelin Whipple, B. C. Burchfiel, X. Zhang, W. Tang

Research output: Contribution to journalArticle

137 Citations (Scopus)

Abstract

Field work and topography analysis show that remnant, local areas of a low-relief landscape or erosion surfaces are geographically continuous across the southeastern Tibetan Plateau margin. We correlate these remnant surfaces as a paleolandscape that formed at low elevation. Remnants of this paleolandscape are preserved because incision of the fluvial system has been largely limited to major rivers and principal tributaries and has not yet progressed throughout the entire fluvial network. The incomplete adjustment of the fluvial system signals initiation of rapid bedrock incision into a developing plateau margin, and erosional denudation is concentrated in the major river channels. This interpretation contradicts earlier notions that low-gradient, regional topography is the product of regional elevation reduction by intense landscape dissection due to the presence of several large southeast flowing rivers. The modern altitude of the reconstructed paleolandscape (or "relict landscape") constrains the vertical displacement of the plateau surface in response to crustal thickening and subsequent erosion during the lateral growth of the Tibetan Plateau. Regional preservation of the relict landscape is consistent with minor surface disruption by late Cenozoic thrust faults and folds and supports a model of distributed lower crustal thickening. Because significant erosion is limited to narrow river gorges, an increase in the plateau elevation due to isostatic rebound is minor. Therefore we propose that the modern elevation of the relict landscape reflects isostatically compensated thickening of the lower crust.

Original languageEnglish (US)
Article numberF03002
JournalJournal of Geophysical Research: Earth Surface
Volume111
Issue number3
DOIs
StatePublished - Sep 24 2006
Externally publishedYes

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plateaus
Rivers
rivers
plateau
Erosion
erosion
Topography
crustal thickening
margins
topography
Dissection
Signal systems
river
tributaries
dissection
canyons
bedrock
denudation
river channel
thrust fault

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Cite this

Use of a regional, relict landscape to measure vertical deformation of the eastern Tibetan Plateau. / Clark, Marin K.; Royden, L. H.; Whipple, Kelin; Burchfiel, B. C.; Zhang, X.; Tang, W.

In: Journal of Geophysical Research: Earth Surface, Vol. 111, No. 3, F03002, 24.09.2006.

Research output: Contribution to journalArticle

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