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Glacial geological studies of surge-type glaciers in Iceland — Research

Artikel i vetenskaplig tidskrift
Författare Olafur Ingolfsson
Ivar Örn Benediktsson
Anders Schomacker
Kurt Kjaer
Skafti Brynjolfsson
Sverrir A. Jonsson
Niels Jakup Korsgaard
Mark D. Johnson
Publicerad i Earth-Science Reviews
Volym 152
Sidor 37-69
ISSN 0012-8252
Publiceringsår 2016
Publicerad vid Institutionen för geovetenskaper
Sidor 37-69
Språk en
Länkar dx.doi.org/10.1016/j.earscirev.2015...
Ämnesord Surge-type glacier, Iceland, Landsystem model, Glaciotectonism, glacial geology
Ämneskategorier Kvartärgeologi, Klimatforskning

Sammanfattning

Surging glaciers are potential analogues for land-terminating palaeo-ice streams and surging ice sheet lobes, and research on surge-type glaciers is important for understanding the causal mechanisms of modern and past ice sheet instabilities. The geomorphic signatures left by the Icelandic surge-type glaciers vary and range from glaciotectonic end moraines formed by folding and thrusting, crevasse-squeeze ridges, concertina eskers, drumlins and fluted forefields, to extensive dead-ice fields and even drift sheets where fast ice-flow indicators are largely missing. We outline some outstanding research questions and review case studies from the surge-type outlets of Brúarjökull, Eyjabakkajökull and Tungnaárjökull (Vatnajökull ice cap), Múlajökull and Sátujökull (Hofsjökull ice cap), Hagafellsjökull and Suðurjökull (Langjökull ice cap), Kaldalónsjökull, Leirufjarðarjökull and Reykjarfjarðarjökull (Drangajökull ice cap), as well as the surge-type cirque glaciers in northern Iceland. We review the current understanding of how rapid ice flow is sustained throughout the surge, the processes that control the development of the surge-type glacier landsystem and the geological evidence of surges found in sediments and landforms. We also examine if it is possible to reconstruct past surge flow rates from glacial landforms and sediments and scale-up present-day surge processes, landforms and landsystems as modern analogues to past ice streams. Finally,we also examine if there is a climate/mass-balance control on surge initiation, duration and frequency.

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