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A 1.3-Myr palaeoceanographic record from the continental margin off Dronning Maud Land, Antarctica

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Show simple item record Forsberg, Carl Fredrik Løvlie, Reidar Jansen, Eystein Solheim, Anders Sejrup, Hans Petter Lie, Hans Erik 2004-08-06T09:42:44Z 2004-08-26T11:57:45Z 2004-08-06T09:42:44Z 2004-08-26T11:57:45Z 2003-09-15
dc.identifier.citation Palaeogeography, Palaeoclimatology, Palaeoecology 2003 198(1-2): 223-235 en
dc.identifier.issn 0031-0182 (print ISSN) en
dc.description.abstract A 12.5 m long core was retrieved from the continental margin off Dronning Maud Land, Antarctica. Magnetostratigraphy, stable isotopes, 14C accelerator mass spectrometer and amino acid analyses indicate a continuous sediment record going back 1.3 Myr. Comparison of CaCO3 results with those from ODP Site 1089 and an index of North Atlantic Deep Water (NADW) influence in surface waters indicate that NADW upwelled along the Antarctic continental margin during the whole of this period. The mid-Pleistocene transition (1.0^0.6 Ma) was accompanied by an apparent decline in the NADW influence, and was followed by extended carbonate dissolution during the interglacials of marine isotope stages (MIS) 13 and 11. Less extensive periods of dissolution occur at the end of the interglacials younger than MIS 11. While interglacial dissolution is characteristic of the Pacific and Indian oceans, the carbon isotopes return to pre-transition values indicative of renewed NADW upwelling. The concentration of ice-rafted debris may reflect changes in the relative rate of interglacial sedimentation. It is speculated that the high ice rafted debris (IRD) concentrations during interglacials younger than 400 kyr may be due to a reduced relative sedimentation rate of other interglacial components whereas the low concentrations during interglacials before the mid-Pleistocene transition may be due to a higher relative sedimentation rate of these. < 2003 Elsevier B.V. All rights reserved. en
dc.format.extent 742994 bytes en
dc.format.extent 32082 bytes
dc.format.extent 137 bytes
dc.format.extent 742994 bytes
dc.format.mimetype application/pdf en
dc.format.mimetype text/plain
dc.format.mimetype application/pdf
dc.language.iso eng en
dc.publisher Elsevier en
dc.subject Antarctic en
dc.subject Weddell Sea en
dc.subject Dronning Maud Land en
dc.subject Palaeoceanography en
dc.subject Stable isotopes en
dc.subject Magnetostratigraphy en
dc.title A 1.3-Myr palaeoceanographic record from the continental margin off Dronning Maud Land, Antarctica en
dc.type Journal article eng
dc.type Peer reviewed eng
dc.accessRights Copyright 2003 Elsevier B.V. en
bora.peerreviewed Peer reviewed eng

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