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Estimates of South Greenland late-glacial ice limits from a new relative sea level curve
Ansvarig organisation
2002 (Engelska)Ingår i: Earth and Planetary Science Letters, ISSN 0012-821X, E-ISSN 1385-013X, Vol. 197, nr 3-4, s. 171-186, artikel-id PII S0012-821X(02)00478-8Artikel i tidskrift (Refereegranskat) Published
Resurstyp
Text
Abstract [en]

Marine-lacustrine isolation contacts from seven basins in the Nanortalik area, South Greenland have been analysed and dated. The basins were isolated from the sea as a consequence of isostatic rebound following deglaciation. The isolation contacts were identified with litho- and biostratigraphical analyses, especially sedimentary changes, grey scale analyses and analyses of macroscopical remains of plants and animals. Dating was performed by analytical mass spectroscopy radiocarbon dating of macrofossils and bulk sediment samples. A slow initial relative sea level fall that begins at 13.8 cal ka BP changes to a rapid relative sea level fall before the sea level fell below the present-day sea level just prior to 10 cal ka BP. The emergence curve goes further back in time than any previous emergence curve constructed from Greenland, which reflects the early deglaciation of the studied region. The glacio-isostatic crustal rebound following deglaciation was around 110 in. The sea level history indicates that the margin of the Greenland ice sheet probably extended out to the shelf margin during the Last Glacial Maximum, and that the ice thickness must have been at least 1500 in over the outer coast. Thus the highest coastal mountains would have been ice-covered, which is surprising given their alpine character. In addition, the major part of the recession of the ice must have occurred relatively late and quickly, maybe from 14 to 12 cal ka BP. The late Holocene transgression may, at least in part, be due to increased isostatic loading as a consequence of advancing glaciers during the Neoglaciation. (C) 2002 Elsevier Science B.V. All rights reserved.

Ort, förlag, år, upplaga, sidor
Geol Survey Denmark & Greenland, DK-2400 Copenhagen NV, Denmark. Lund Univ, Dept Quaternary Geol, S-22363 Lund, Sweden. Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia., 2002. Vol. 197, nr 3-4, s. 171-186, artikel-id PII S0012-821X(02)00478-8
Nyckelord [en]
sea-level changes, Holocene, Greenland, last glacial maximum
Forskningsämne
SWEDARCTIC 2002, Kap Farvel; SWEDARCTIC 2003, Grönland 2003
Identifikatorer
URN: urn:nbn:se:polar:diva-2637DOI: 10.1016/S0012-821X(02)00478-8ISI: 000175551700004OAI: oai:DiVA.org:polar-2637DiVA, id: diva2:894170
Tillgänglig från: 2016-01-14 Skapad: 2016-01-14 Senast uppdaterad: 2017-11-30

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