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(Article of periodic en Anglais - 2014)

Document title

Influence of bedding dip on glacial erosional landforms, Uinta Mountains, USA

Authors(s) and Affiliation(s)

KELLY M.H. (1) ; ANDERS A.M. (1) ; GRAN MITCHELL S. (2) ;
(1) Dept. of Geology, Univ. of Illinois, Urbana, ETATS-UNIS
(2) Biology Dept., College of the Holy Cross, Worcester, ETATS-UNIS

Abstract

The AA. explore the relationships amongst bedding dip, basin aspect, and glacial landforms using field observations and GIS analyses of the northwestern Uinta Mountains of Utah. They examine basins on opposing sides of 3 ice divides in which quartzite beds of the Mount Watson Formation maintain a near constant dip. They map the occurrence of 3 glacial erosional landforms : cliffs showing evidence of quarrying, scoured surfaces polished by abrasion, and overdeepenings. Cliffs and overdeepenings are more common in basins where bedding dips up-basin, while scoured surfaces are more prevalent where bedding dips down-basin. The significance of jointing in controlling glacial erosional forms is well established and the AA. propose that bedding, as well as joints, dictates the geometry of quarried blocks and influences the spatial patterns of process dominance. Where bedding dips up-basin, the geometry of pre-existing weaknesses favours quarrying creating both cliffs and overdeepenings. In contrast, where bedding dips down-basin, block geometry does not favour the creation of overdeepenings via quarrying and exposed bedding planes are subjected to glacial abrasion, producing scoured surfaces

Source

Article of periodic

published at : Geografiska annaler. Series A. Physical geography / ISSN 0435-3676 / CODEN GAPGAP

Editor : Svenska sällskapet för antropologi och geografi, Stockholm - SUEDE (1965)

Millesime : 2014, vol. 96, no2 [pp. 147-159]

Bibliographic references : 31 ref.

Collation : 7 fig., 1 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 2704 A

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1111/geoa.12037

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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