Show simple item record

dc.contributor.author Michael J. en_US
dc.contributor.author Neil F. en_US
dc.contributor.author Becky en_US
dc.date.accessioned 2009-05-19T08:46:36Z
dc.date.available 2009-05-19T08:46:36Z
dc.date.issued 2002-03 en_US
dc.identifier http://dx.doi.org/10.3189/172756502781831494 en_US
dc.identifier.citation Hambrey , M J , Glasser , N F & Goodsell , B 2002 , ' Formation of band ogives and associated structures at Bas Glacier d'Arolla, Valais, Switzerland ' Journal of Glaciology , vol 48 , no. 161 , pp. 287-300 . , 10.3189/172756502781831494 en_US
dc.identifier.other PURE: 100724 en_US
dc.identifier.other dspace: 2160/2243 en_US
dc.identifier.uri http://hdl.handle.net/2160/2243
dc.description.abstract Structural glaciological, sedimentological and geophysical techniques are used to provide new insight concerning the formation of band ogives and associated structures at Bas Glacier dArolla, Switzerland. Sedimentary stratification, crevasse traces and transverse foliation are identified as planar structures in the lower icefall and glacier tongue. Stratification and crevasse traces are progressively deformed into, and enhance, the transverse foliation found in the glacier tongue. Three-dimensional geometry has been defined using ground-penetrating radar, which portrays four main characteristics: (i) deep reflectors interpreted as the ice/bed interface, (ii) alternating reflection-rich and reflection-poor zones interpreted as ogives, (iii) up-glacier-dipping reflectors, interpreted as planar structures, and (iv) down-glacier-dipping reflectors of uncertain origin. At the glacier surface, each band ogive consists of a light and dark band. The dark bands contain more intense foliation which, on differential weathering, traps fine debris. Clasts and clear ice of basal character within dark ogive bands suggest that basal ice has been raised to the glacier surface. The most applicable model for the formation of band ogives at Bas Glacier dArolla is a refinement of Posamentier's (1978) reverse faulting hypothesis. In this context, multiple shear zones are formed, through which basal ice is uplifted to the glacier surface to produce the dark, foliated ogive bands. This model fits observations reported from other glaciers with band ogives. en_US
dc.format.extent 14 en_US
dc.relation.ispartof Journal of Glaciology en_US
dc.subject Europe en_US
dc.subject Switzerland en_US
dc.subject Geometrical structure en_US
dc.subject Three dimensional structure en_US
dc.subject Radar observation en_US
dc.subject Glacier crevasse en_US
dc.subject Models en_US
dc.subject Debris en_US
dc.subject Interface en_US
dc.subject Basal ice en_US
dc.subject Glacial tongue en_US
dc.subject Stratification en_US
dc.subject Glacier en_US
dc.title Formation of band ogives and associated structures at Bas Glacier d'Arolla, Valais, Switzerland en_US
dc.contributor.pbl Institute of Geography & Earth Sciences en_US
dc.contributor.pbl Centre for Glaciology en_US


Files in this item

Aside from theses and in the absence of a specific licence document on an item page, all works in Cadair are accessible under the CC BY-NC-ND Licence. AU theses and dissertations held on Cadair are made available for the purposes of private study and non-commercial research and brief extracts may be reproduced under fair dealing for the purpose of criticism or review. If you have any queries in relation to the re-use of material on Cadair, contact is@aber.ac.uk.

This item appears in the following Collection(s)

Show simple item record

Search Cadair


Advanced Search

Browse

Statistics