Till sidans topp

Sidansvarig: Webbredaktion
Sidan uppdaterades: 2012-09-11 15:12

Tipsa en vän
Utskriftsversion

Glaciofluvial canyons and… - Göteborgs universitet Till startsida
Webbkarta
Till innehåll Läs mer om hur kakor används på gu.se

Glaciofluvial canyons and their relation to the Late Weichselian deglaciaton in Fennoscandia

Artikel i vetenskaplig tidskrift
Författare Mats Olvmo
Publicerad i Zeitschrift für Geomorphologie
Volym 36
Nummer/häfte 3
Sidor 343-363
ISSN 0372-8854
Publiceringsår 1992
Publicerad vid Naturgeografiska institutionen
Sidor 343-363
Språk en
Ämneskategorier Fysisk geografi

Sammanfattning

The paper describes and discusses the origin of young canyons in Sweden known as "kurs", "skura" and "grav". The study revealed a concentration of canyons in three main areas in Sweden, the northestern, the southeastern and the west-central parts. On the basis of detailed maps and field investigations of certain key areas, the majority of the canyons were interpreted, according to their strong connection to glaciofluvial deposits and other glaciofluvial landforms, as well as to the morphology of the canyons themselves, as being glaciofluvial formations. based on the morphological characteristics of the canyons and their related glaciofluvial deposits, it was concluded that they were basically formed by subaerial meltwater streams which flowed marginally along the ice margin, inframarginally in open crevasses or extramarginally outside the ice margin. It was also suggested that some canyons were formed by supraglacial streams which were superimposed on the ground. One of the canyons studied was, at least partly, formed by sublacial meltwater erosion. The subaerial nature of the glaciofluvial stream indicated by the morphological analyses has been tentatively proposed as revealing cold ice, or cold-based ice, in the marginal zone. As a consequence, it was suggested that the distribution pattern correspond to areas having cold based conditions during the Late Weichselian deglaciation. The significance of subaerial conditions in the ice-marginal zone was pointed out. It was suggested that glaciofluvial erosion in the subaerial, ice-marginal environment is facilitatated by preparative frost weathering before and during runoff. This process may explain the effective bedrock erosion documented by the canyons.

Sidansvarig: Webbredaktion|Sidan uppdaterades: 2012-09-11
Dela:

På Göteborgs universitet använder vi kakor (cookies) för att webbplatsen ska fungera på ett bra sätt för dig. Genom att surfa vidare godkänner du att vi använder kakor.  Vad är kakor?