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(Article of periodic en Anglais - 2008)

Document title

Mountain-top detritus and patterned ground in the Gaspésie Mountains, Québec, Canada

published at : Modelling of high-mountain relief

Authors(s) and Affiliation(s)

FRENCH H.M. (1) ; BJORNSON J. (1) ;
(1) Dep. of Geography, Univ., Ottawa, CANADA

Abstract

Mountain-top detritus characterizes the 2 high summits of the Gaspésie Montains, eastern Canada. It is suggested that these angular rock-rubble accumulations developed from the disintegration of coarse-grained igneous bedrock exposed to thermal stress and ice segregation during prolonged episodes of permafrost formation in the cold periods of the Pleistocene. Frost wedging and frost heaving ("jacking") were the primary mechanisms. Today, climatic conditions on the summits permit only thin and marginal permafrost bodies. Stonenets and stripes are developed where a residual bedrock-derived debris mantle is present. They reflect frost-induced movements within the active layer. The latest of these movements probably occurred during the cold period following the LGM and persisted into the mid-Holocene. The transition from nets to stripes relates to slope angle

Source

Thematical fascicle

published at : Geographia polonica / ISSN 0016-7282 / CODEN GGPLAE

Editor : Państwowe Wydawnictwo Naukowe, Warszawa - POLOGNE (1964)

Millesime : 2008, vol. 81, no 1 [pp. 29-39]

Bibliographic references : 1,5 p.

Collation : fig., tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 12059

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2009
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