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- Title
Holocene shore displacement and chronology in Ångermanland, eastern Sweden, the Scandinavian glacio-isostatic uplift centre.
- Authors
Berglund, Mikael
- Abstract
The shore displacement during the Holocene in southeastern Ångermanland, Sweden, has been investigated by means of radiocarbon-dating of isolation intervals in sediment cores from a total of nine new basins. Results from earlier investigations have been used in complement. There is a forced regression in the area from c . 9300 BP ( c . 10 500 cal. yr BP) until c . 8000 BP ( c . 9000 cal. yr BP), on average c . 8 m/100 years, after which there is a gradually slowing regression of c . 2.5-1.0 m/100 years up to the present time. The most rapid regression occurs during the later phase of the Ancylus Lake stage, 9500-9000 cal. yr BP. There is no evidence of halts in the regression. Crustal uplift in the area since deglaciation is c . 310 m. The deglaciation of southeastern Ångermanland took place c . 9300 BP ( c . 10 500 cal. yr BP); this is c . 900 years earlier than the age given by clay varve dating. The shore displacement curve provides a means of estimating the difference between the clay varve time scale and calibrated radiocarbon dates, by comparison with varve-dated altitudes of alluvial deltas of the River Ångermanälven. From c . 2500 to c . 8000 cal. BP there is a deficit in clay varves of some 300 years; further back in time this discrepancy increases significantly. The main explanation for the discrepancy is most likely lacking varves in the time-span 8500-10 200 cal. yr BP, located along the upper reaches of River Ångermanälven below the highest shore level.
- Subjects
ANGERMANLAND (Sweden); ANGERMANALVEN (Sweden); SWEDEN; RADIOCARBON dating; CHRONOLOGY; HOLOCENE stratigraphic geology
- Publication
Boreas, 2004, Vol 33, Issue 1, p48
- ISSN
0300-9483
- Publication type
Article
- DOI
10.1080/03009480310006961