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- W1888897993 abstract "Proglacial environments are an integrated part of the glacier landscape, housing a variety of landforms fed by glacier meltwater. Their appearance is dependent on a number of factors, such as the variability of source material and processes active during the transportation and deposition. The present work aims to investigate two such terrestrial outwash successions from the terminus region of the Mýrdalsjokull ice cap, south Iceland; respectively in a modern and an ancient setting. Both deposits are described in detail regarding their architecture and sedimentology, compared with each other and finally classified as alluvial fans of the Hochsander type. The modern fan formed during the 1980s in association with an advancing glacier with a steep, debris-covered frontal slope, while the fossil fan developed as a consequence of the 934-938 AD Eldgja fire releasing huge quantities of tephra over the glacier surface. Supraglacial material feeding the fans was collected in drainage paths and transported off the glacier surface on to the forefield, either directly dispersed or transported downstream in incised channels, before spreading at an intersection point. Average daily sedimentation rates of 2.5 cm have been measured for the most active time of development of the modern fan. Deposition occurred mainly within networks of laterally migrating braided streams, generally 0.1-0.5 m wide and up to 30 cm deep. During floodings sheetflows, sometimes transformed into hyperconcentrated flows, and accompanying antidune formation dominated. Collectively, these depositional processes generated fans constructed of planar-bedded sands and low-angled cross-bedded sands interbedded with thin gravelbeds and occasional mud-drapes, related to subaerial fan exposure. The material of Hochsanders is generally moderately to poorly sorted, mainly belonging to the middle sand fractions. Architecturally, the fans have all the characteristics of an alluvial fan, with a semiconical shape, a plano-convex cross-profile, a slope ranging from 1-5° and a radial length of 1-1.5 km. It is concluded that Hochsanders are highly influential on the architecture of superimposed landforms. Moreover, their presence may give valuable information about local palaeo-climate and the transition from ice marginal to proglacial environments." @default.
- W1888897993 created "2016-06-24" @default.
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- W1888897993 date "2002-01-01" @default.
- W1888897993 modified "2023-09-24" @default.
- W1888897993 title "Reconstruction of fan-shaped outwash in front of the Mýrdalsjökull ice cap, Iceland : architecture and style of sedimentation" @default.
- W1888897993 hasPublicationYear "2002" @default.
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