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Geografiska annaler. Series A, Physical geography, 1988, Vol.70 (1-2), p.27-33
Ort / Verlag
Oxford: Taylor & Francis
Erscheinungsjahr
1988
Link zum Volltext
Quelle
Taylor & Francis Journals Auto-Holdings Collection
Beschreibungen/Notizen
Numerous ploughing blocks characterize the south-facing valley, north of the Finse railway station in South-Central Norway. The largest, 4,9 by 5,0 by 5,6 m, calculated to weigh about 36.400 kg, is the most conspicuous. Upslope is a 42,5 m linear depression; downslope is a type B mound, ploughed up by the block. It is proposed that greater thermal conductivity of the block causes earlier freezing beneath it, drawing water from adjacent sediment to the freezing front. Faster thawing of the higher water-content sediment in the spring allows squeezing of mud from beneath the block, which then slides preferentially downslope into the space vacated by the mud. With this area first having been ice-free c. 9000 yrs B.P., the average minimum rate of movement over this 18° slope has been about 0,5 cm/yr. The Finse block is the largest ploughing block and has the longest trough of any known to date.