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Long-term river terrace sequences: Evidence for global increases in surface uplift rates in the Late Pliocene and early Middle Pleistocene caused by flow in the lower continental crust induced by surface processes

Published online by Cambridge University Press:  01 April 2016

R. Westaway
R. Westaway*
Affiliation:
16 Neville Square, Durham DH1 3PY, England.

Abstract

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Long-term river terrace sequences reveal that many regions have uplifted by several hundred metres since the Middle Pliocene. They indeed provide evidence of a global increase in uplift rates in die Late Pliocene, followed by a calm period then a renewed increase around the Early-Middle Pleistocene boundary. It is suggested that this uplift pattern has resulted from thickening of the continental crust caused by flow in the lower crust which has been induced by cyclic surface loading caused by growth and decay of ice sheets and the associated global sea-level fluctuations. Observed uplift histories are modelled using a technique which incorporates increases in the strength of forcing of this process caused by step changes in the intensity of glaciations starting at~3.1,~2.5,~1.2, and~0.9 Ma.

Keywords

Quaternaryglaciationriver terracesupliftsurface processeslower-crustal flow
Type
Research Article
Information
Netherlands Journal of Geosciences , Volume 81 , Special Issue 3-4: Fluvial Archive Group, FLAG , December 2002 , pp. 305 - 328
Copyright
Copyright © Stichting Netherlands Journal of Geosciences 2002

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