Title: Holocene relative sea-level changes in the Tasiusaq area, southern Greenland, with focus on the Ta4 basin
Abstract:Until recently there have only been a few observations of relative sea-level change from the inner
Bredefjord area in southern Greenland. Here a new sea-level curve is presented from the Tasiusaq are...Until recently there have only been a few observations of relative sea-level change from the inner
Bredefjord area in southern Greenland. Here a new sea-level curve is presented from the Tasiusaq area based on
data mainly from a sediment sequence from a marine embayment. Sea-level changes can be recorded in sediments
as changed chemical composition, physical properties and macrofossil content. Isolation and transgression
sequences have been identified using lithology, loss on ignition, XRF and macrofossil analysis. Selected
stratigraphical levels were AMS-dated, and additional sea level data was extracted from GPS and tidal
measurements. Special attention has been given to the relation between tide and depositional environment during
sea-level changes. The results suggest a rapid regression of 26 m in the Tasiusaq area between 8750 and 8050 cal.
yr BP, about 1000 years later than at the coast. The sea level fell below present day level at 8050 cal. yr BP. The
regression continued and the sea level reached below 3.5 m below highest astronomical tide (m b.h.a.t.) at 7300 cal.
yr BP where it remained until 1210 cal. yr BP. The present day sea level was reached again sometime during the
last 500 years. The marine limit was determined to c. 40 m above highest astronomical tide (m a.h.a.t.).
Comparisons of the marine limit in the Bredefjord area suggest that much of the land uplift occurred before the
Tasiusaq area was finally deglaciated. The transgression started also more than 2000 years later in Tasiusaq than at
the coast, despite the fact that Tasiusaq is situated closer to the Greenland Ice Sheet. This anomaly can be explained
by differential effects from the collapse of the Laurentide Ice Sheet peripheral bulge and the Neoglacial readvance.Read More
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
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Cited By Count: 5
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