Formation of band ogives and associated structures at Bas Glacier d'Arolla, Valais, Switzerland

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dc.contributor.author Hambrey, Michael J.
dc.contributor.author Glasser, Neil F.
dc.contributor.author Goodsell, Becky
dc.date.accessioned 2009-05-19T08:46:36Z
dc.date.available 2009-05-19T08:46:36Z
dc.date.issued 2002-03
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 . en
dc.identifier.issn 0022-1430
dc.identifier.other PURE: 100724
dc.identifier.other dspace: 2160/2243
dc.identifier.uri http://hdl.handle.net/2160/2243
dc.identifier.uri http://www.igsoc.org/journal/48/ en
dc.description Hambrey, M.J., Glasser, N.F., Goodsell, Becky, (2002) Formation of band ogives and associated structures at Bas Glacier d'Arolla, Valais, Switzerland, Journal of Glaciology 48 (161), pp. 287-300 Keywords: Europe ; Switzerland ; Geometrical structure ; Three dimensional structure ; Radar observation ; Glacier crevasse ; Models ; Debris ; Interface ; Basal ice ; Glacial tongue ; Stratification ; Glacier en
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
dc.format.extent 14 en
dc.language.iso eng
dc.relation.ispartof Journal of Glaciology en
dc.subject Europe en
dc.subject Switzerland en
dc.subject Geometrical structure en
dc.subject Three dimensional structure en
dc.subject Radar observation en
dc.subject Glacier crevasse en
dc.subject Models en
dc.subject Debris en
dc.subject Interface en
dc.subject Basal ice en
dc.subject Glacial tongue en
dc.subject Stratification en
dc.subject Glacier en
dc.title Formation of band ogives and associated structures at Bas Glacier d'Arolla, Valais, Switzerland en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.3189/172756502781831494
dc.contributor.institution Institute of Geography & Earth Sciences en
dc.contributor.institution Centre for Glaciology en
dc.description.status Peer reviewed en


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