Paleomagnetic on three sediment cores from the Antarctic continental slope in the Weddell Sea
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| Main Authors: | , , , , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
1990
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| _version_ | 1867167658764402688 |
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| author | Grobe, Hannes Mackensen, Andreas Hubberten, Hans-Wolfgang Spieß, Volkhard Fütterer, Dieter K |
| author_facet | Grobe, Hannes Mackensen, Andreas Hubberten, Hans-Wolfgang Spieß, Volkhard Fütterer, Dieter K |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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, sedimentological 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 | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_587842 |
| institution | PANGAEA |
| language | en |
| publishDate | 1990 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Paleomagnetic on three sediment cores from the Antarctic continental slope in the Weddell Sea Grobe, Hannes Mackensen, Andreas Hubberten, Hans-Wolfgang Spieß, Volkhard Fütterer, Dieter K ANT-IV/3; Atka Bay; AWI_Paleo; Gravity corer (Kiel type); Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS08; PS08/365; PS08/374; PS08/486; PS1387-3; PS1394-4; PS1431-1; SL 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, sedimentological 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. |
| title | Paleomagnetic on three sediment cores from the Antarctic continental slope in the Weddell Sea |
| topic | ANT-IV/3; Atka Bay; AWI_Paleo; Gravity corer (Kiel type); Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS08; PS08/365; PS08/374; PS08/486; PS1387-3; PS1394-4; PS1431-1; SL |
| url | https://doi.org/10.1594/PANGAEA.587842 |