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Holocene shore displacement and chronology in Ångermanland, eastern Sweden, the Scandianvian glacio-isostatic uplift centre
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för naturvetenskap.
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2004 (Engelska)Ingår i: Boreas, ISSN 0300-9483, E-ISSN 1502-3885, Vol. 33, nr 1, s. 48-60Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

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

Ort, förlag, år, upplaga, sidor
2004. Vol. 33, nr 1, s. 48-60
Nyckelord [en]
Quaternary geology
Nationell ämneskategori
Geovetenskap och miljövetenskap
Identifikatorer
URN: urn:nbn:se:miun:diva-2607DOI: 10.1080/03009480310006961ISI: 000220044000004Lokalt ID: 1964OAI: oai:DiVA.org:miun-2607DiVA, id: diva2:27639
Tillgänglig från: 2008-09-30 Skapad: 2008-09-30 Senast uppdaterad: 2017-12-12Bibliografiskt granskad

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