NJG81-1-03
2001
Holocene glacial and colluvial activity in Leirungsdalen, eastern Jotunheimen, southcentral Norway
81
1
pp. 25-40
82-519-1641-0

Two terrestrial sections have been studied in order to reconstruct the Holocene glacial and colluvial history in Leirungsdalen, eastern Jotunheimen. The interpretation of individual sedimentary units is based on the grain-size distribution and compared with modern analogue samples collected in the respective streams and at sites close to the present glaciers. Stages of enhanced debris flow or glacial activity are recognized as sand and silt layers, respectively, while periods of low colluvial and glacial activity in the catchment are characterised by continuous peat accumulation. Age/depth curves based on radiocarbon dates from the Svarthammarbu and Steinflybekken sections indicate debris flow activity >7500, 7300-6800,6600-5500,5800,5700,5300-4900,4700,4500,4300,2300,2100-1500, 1300,700-600 and 500-400 cal.yr BP. The first Holocene glacia! signal is detected ca. 5300 cal.yr BP. The frequency of glacial events seems to have increased during the Late Holocene, especially during the last 1500 cal.yr BP. Periods of enhanced debris flow activity back to 7000-6000 cal.yr BP, are largely in agreement with a similar record obtained from Leirdalen, western Jotunheimen.

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