Show simple item record Michael J. en_US Neil F. en_US Becky en_US 2009-05-19T08:46:36Z 2009-05-19T08:46:36Z 2002-03 en_US
dc.identifier 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.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

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