Stable isotope record and late Quaternary sedimentation rates at the Antarctic continental margin
Four cores from the Antarctic continental margin located between 50 and 200 km from the present-day ice shelf edge, were selected for sedimentological and mass spectrometer analysis. The first stable isotope records of the Southern Polar Ocean can be correlated in detail with global isotope stratigr...
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ftawi:oai:epic.awi.de:1073 2024-09-15T17:43:41+00:00 Stable isotope record and late Quaternary sedimentation rates at the Antarctic continental margin Grobe, Hannes Mackensen, Andreas Hubberten, Hans-Wolfgang Spiess, V. Fütterer, Dieter 1990 application/pdf https://epic.awi.de/id/eprint/1073/ https://epic.awi.de/id/eprint/1073/1/Gro1990a.pdf https://hdl.handle.net/10013/epic.11660 https://hdl.handle.net/10013/epic.11660.d001 unknown https://epic.awi.de/id/eprint/1073/1/Gro1990a.pdf https://hdl.handle.net/10013/epic.11660.d001 Grobe, H. orcid:0000-0002-4133-2218 , Mackensen, A. orcid:0000-0002-5024-4455 , Hubberten, H. W. , Spiess, V. and Fütterer, D. (1990) Stable isotope record and late Quaternary sedimentation rates at the Antarctic continental margin , Geological history of the polar oceans, Arctic versus Antarctic (U. Bleil, J. Thiede, eds ), NATO ASI series C308, Kluwer, Dordrecht, pp. 539-572 . hdl:10013/epic.11660 EPIC3Geological history of the polar oceans, Arctic versus Antarctic (U. Bleil, J. Thiede, eds ), NATO ASI series C308, Kluwer, Dordrecht, pp. 539-572, ISBN: 0-7923-0739-9 Article peerRev 1990 ftawi 2024-06-24T03:53:34Z Four cores from the Antarctic continental margin located between 50 and 200 km from the present-day ice shelf edge, were selected for sedimentological and mass spectrometer analysis. The first stable isotope records of the Southern Polar Ocean can be correlated in detail with global isotope stratigraphy. Together with magnetostratigraphic, sedi¬mentological and micropaleontological data, the record provides stratigraphic and paleoceanographic information back to the Jaramillo subchron (910 kyr).Although the isotope values have been altered by diagenetic processes in the sediments, which are poor in carbonate, an interpretation is possible via correlation with the sedimentological parameters. Oxygen isotope data give indications for a meltwater spike at the beginning of interglacials, when large scale melting of parts of the ice shelves took place. The synchronous record of the benthic and planktonic d13C-signals reflect continuous bottom water formation also during glacials.Primary productivity was strictly reduced during glacials due to continuous ice coverage in the Weddell Sea. The climatic improvement at the beginning of an interglacial is associated with peak values in biologic activity lasting for about 15 kyr.During one climatic cycle, mean sedimentation rates at the continental margin decrease with increasing distance from the continent from 5.2 to 1.3 cm/kyr. Maximum sedimentation rates of 25 cm/kyr at the beginning of an interglacial down to 0.6 cm/kyr during glacial periods have been calculated. The rate is mainly controlled by movements of the ice shelf edge and ice rafting. Article in Journal/Newspaper Antarc* Antarctic Arctic Ice Shelf Ice Shelves Weddell Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Four cores from the Antarctic continental margin located between 50 and 200 km from the present-day ice shelf edge, were selected for sedimentological and mass spectrometer analysis. The first stable isotope records of the Southern Polar Ocean can be correlated in detail with global isotope stratigraphy. Together with magnetostratigraphic, sedi¬mentological and micropaleontological data, the record provides stratigraphic and paleoceanographic information back to the Jaramillo subchron (910 kyr).Although the isotope values have been altered by diagenetic processes in the sediments, which are poor in carbonate, an interpretation is possible via correlation with the sedimentological parameters. Oxygen isotope data give indications for a meltwater spike at the beginning of interglacials, when large scale melting of parts of the ice shelves took place. The synchronous record of the benthic and planktonic d13C-signals reflect continuous bottom water formation also during glacials.Primary productivity was strictly reduced during glacials due to continuous ice coverage in the Weddell Sea. The climatic improvement at the beginning of an interglacial is associated with peak values in biologic activity lasting for about 15 kyr.During one climatic cycle, mean sedimentation rates at the continental margin decrease with increasing distance from the continent from 5.2 to 1.3 cm/kyr. Maximum sedimentation rates of 25 cm/kyr at the beginning of an interglacial down to 0.6 cm/kyr during glacial periods have been calculated. The rate is mainly controlled by movements of the ice shelf edge and ice rafting. |
format |
Article in Journal/Newspaper |
author |
Grobe, Hannes Mackensen, Andreas Hubberten, Hans-Wolfgang Spiess, V. Fütterer, Dieter |
spellingShingle |
Grobe, Hannes Mackensen, Andreas Hubberten, Hans-Wolfgang Spiess, V. Fütterer, Dieter Stable isotope record and late Quaternary sedimentation rates at the Antarctic continental margin |
author_facet |
Grobe, Hannes Mackensen, Andreas Hubberten, Hans-Wolfgang Spiess, V. Fütterer, Dieter |
author_sort |
Grobe, Hannes |
title |
Stable isotope record and late Quaternary sedimentation rates at the Antarctic continental margin |
title_short |
Stable isotope record and late Quaternary sedimentation rates at the Antarctic continental margin |
title_full |
Stable isotope record and late Quaternary sedimentation rates at the Antarctic continental margin |
title_fullStr |
Stable isotope record and late Quaternary sedimentation rates at the Antarctic continental margin |
title_full_unstemmed |
Stable isotope record and late Quaternary sedimentation rates at the Antarctic continental margin |
title_sort |
stable isotope record and late quaternary sedimentation rates at the antarctic continental margin |
publishDate |
1990 |
url |
https://epic.awi.de/id/eprint/1073/ https://epic.awi.de/id/eprint/1073/1/Gro1990a.pdf https://hdl.handle.net/10013/epic.11660 https://hdl.handle.net/10013/epic.11660.d001 |
genre |
Antarc* Antarctic Arctic Ice Shelf Ice Shelves Weddell Sea |
genre_facet |
Antarc* Antarctic Arctic Ice Shelf Ice Shelves Weddell Sea |
op_source |
EPIC3Geological history of the polar oceans, Arctic versus Antarctic (U. Bleil, J. Thiede, eds ), NATO ASI series C308, Kluwer, Dordrecht, pp. 539-572, ISBN: 0-7923-0739-9 |
op_relation |
https://epic.awi.de/id/eprint/1073/1/Gro1990a.pdf https://hdl.handle.net/10013/epic.11660.d001 Grobe, H. orcid:0000-0002-4133-2218 , Mackensen, A. orcid:0000-0002-5024-4455 , Hubberten, H. W. , Spiess, V. and Fütterer, D. (1990) Stable isotope record and late Quaternary sedimentation rates at the Antarctic continental margin , Geological history of the polar oceans, Arctic versus Antarctic (U. Bleil, J. Thiede, eds ), NATO ASI series C308, Kluwer, Dordrecht, pp. 539-572 . hdl:10013/epic.11660 |
_version_ |
1810490780224061440 |