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(Article of periodic en Anglais - 2010)

Document title

A general model of autochthonous blockfield evolution

Authors(s) and Affiliation(s)

BALLANTYNE C.K. (1) ;
(1) School of Geography and Geosciences, Univ., St Andrews, ROYAUME-UNI

Abstract

Two competing models have been invoked to explain the evolution of autochthonous blockfields: the Neogene model, which envisages that blockfield debris was produced by pre-Quaternary chemical weathering; and the periglacial model, which explains autochthonous blockfields as the product of weathering and frost sorting under cold conditions during the Quaternary. This paper proposes that the evidence favouring both models can be accommodated within a single evolutionary framework. Research demonstrating tor emergence during the Pleistocene and rates of long-term regolith production indicate lowering of blockfield-mantled surfaces by at least several metres during the Quaternary. It is proposed that the dominant mechanism operating in the later stages of blockfield evolution has been frost wedging of jointed bedrock at the base of the active layer

Source

Article of periodic

published at : Permafrost and periglacial processes / ISSN 1045-6740 / CODEN PEPPED

Editor : Wiley, Chichester - ROYAUME-UNI (1990)

Millesime : 2010, vol. 21, no4 [pp. 289-300]

Bibliographic references : 2 p.

Collation : 4 fig.

Language

Anglais

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/ppp.700

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2011
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