Geological characteristics of the Halti-Ridnitsohkka region, Enontekio, Finland

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Authors:Hirvas, H.; Lintinen, P.; Ojala, A.; Vanhala, H.
Main Author Affiliation:Hirvas, H., Geological Survey of Finland, Espoo
Volume Title:Quaternary studies in the northern and Arctic regions of Finland
Volume Authors:Ojala, A., editor
Source:Quaternary studies in the northern and Arctic regions of Finland, Kilpisjarvi Biological Station, Finland, Jan. 13-14, 2005 [Quaternary studies in the northern and Arctic regions of Finland. Special Paper - Geological Survey of Finland, Vol.40, p.7-12;]; edited by Antti E. K. Ojala. Publisher: Geological Survey of Finland, Espoo, Finland. ISSN: 0782-8535. ISBN: 951-690-930-2
Publication Date:2005
Note:In English. 10 refs. CRREL Acc. No: 60003192; illus., incl. sketch map
Abstract:At present, the harshest climatic conditions in Finland are found at the highest fell summits of the Halti-Ridnitsohkka area, north-west of Enontekio municipality in Lapland. The summit region of Ridnitsohkka is an extensive area representing morphological features related to recent periglacial activity. The basal till at the summit plateau is devoid of vegetation cover and displays patterned ground features. At the end of July during several summer seasons, frozen ground conditions have been found in the till at a depth of 0.85-1.9 m. Typical morphological features of the slopes are solifluction terraces and lobes. The eastern flank of Ridnitsohkka has the most extensive area of permanent snow (3 km2) in Finland. The present thickness of the snowfield is about 6 m, and according to radiocarbon dating of plant remnants found in the snow at a depth of about 4 m, the age of the snow is only a few decades. According historical records and aerial photographs, the snowfield has existed for at least one hundred years, but during the last few years the size has considerably diminished. During deglaciation of the Weichselian ice sheet the ice terminus retreated to the south, leaving small mountain glaciers in the area. The most distinct morphological feature is the cirque on the eastern flank of Kovddoskaisi. The valley glacier that occupied the Kovdajohka valley is well indicated by a set of more than ten end moraines. Surface boulders and stones of olivine gabbro type, originating from the Halti fell, also indicate the extent and ice-flow direction from north to south, i.e. opposite to the main ice flow direction of the Scandinavian ice sheet in the area.
Index Terms:Cirques; Geomorphology; Glacial geology; Patterned ground; Permafrost; Sediments; Snow; Solifluction; Absolute age; Clastic sediments; Dates; End moraines; Glacial features; Modern; Moraines; Periglacial features; Plantae; Till; Europe; Finland; Lapland; Lapland Finland; Scandinavia; Western Europe; Radioactive age determination; Permafrost dating; Age determination; Finland--Enontekio; Finland--Lapland; Enontekio Finland; Halti Finland; Ridnitsohkka
Coordinates:N691400 N691400 E0212000 E0212000
Publication Type:conference paper or compendium article
Record ID:268613
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute.
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