Sedimentology of cores from the Bellingshausen Sea, Antarctic
On the continental rise west of the Antarctic Peninsula there are nine large mounds interpreted as sediment drifts, separated by turbidity current channels. Drift 7 is 150 km long, 70 km wide and up to 700 m high and is asymmetric, with steep sides on the south-east (towards the continent) and south...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.671555 2023-05-15T13:42:09+02:00 Sedimentology of cores from the Bellingshausen Sea, Antarctic Pudsey, Carol J Camerlenghi, Angelo MEDIAN LATITUDE: -67.676236 * MEDIAN LONGITUDE: -76.892792 * SOUTH-BOUND LATITUDE: -67.916667 * WEST-BOUND LONGITUDE: -77.753167 * NORTH-BOUND LATITUDE: -67.277000 * EAST-BOUND LONGITUDE: -76.038500 * DATE/TIME START: 1995-02-01T04:56:00 * DATE/TIME END: 1995-02-14T14:53:00 2007-12-05 application/zip, 12 datasets https://doi.pangaea.de/10.1594/PANGAEA.671555 https://doi.org/10.1594/PANGAEA.671555 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.671555 https://doi.org/10.1594/PANGAEA.671555 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Pudsey, Carol J; Camerlenghi, Angelo (1998): Glacial-interglacial deposition on a sediment drift on the Pacific margin of the Antarctic Peninsula. Antarctic Science, 10(3), 286-308, https://doi.org/10.1017/S0954102098000376 Explorer GC Gravity corer SED-01 SED-04 SED-05 SED-06 SED-07 SED-08 SED-09 SEDANO-I Dataset 2007 ftpangaea https://doi.org/10.1594/PANGAEA.671555 https://doi.org/10.1017/S0954102098000376 2023-01-20T07:31:06Z On the continental rise west of the Antarctic Peninsula there are nine large mounds interpreted as sediment drifts, separated by turbidity current channels. Drift 7 is 150 km long, 70 km wide and up to 700 m high and is asymmetric, with steep sides on the south-east (towards the continent) and south-west, and gentle slopes to north-west and north-east. Cores on the gentle sides of the drift show a cyclicity between brown, bioturbated, diatom-bearing mud with foraminifera and radiolarians, and grey, laminated, barren mud. Biostratigraphic evidence is consistent with a Late Quaternary age. Detailed lithostratigraphy and magnetic susceptibility data allow precise correlation over distances of tens of kilometres. On the basis of chemostratigraphy, the brown sediment is interpreted as interglacial (isotope stages 1 and 5) and the grey as glacial (stages 2-4 and 6). Sedimentation rates are 3.0-5.5 cm/ka. Cores on the steep sides of the drift recovered a condensed section with thinner cycles and hiatuses. Fine grain size, very poor sorting and the absence of a mode in the silt size range indicate deposition from suspension with only weak current activity, There is little evidence for cyclic changes in bottom current strength. Supply of sediment to the benthic nepheloid layer was by entrainment ofmud from turbidity currents, and by settling ofpelagic material (biogenic grains, IRD, sediment suspended in meltwater plumes). Cyclic changes in sediment supply include more biogenic supply in interglacials with less sea ice cover, more terrigenous supply from turbidites in glacials with ice sheets grounded to the shelf edge, and changes in IRD content. Dataset Antarc* Antarctic Antarctic Peninsula Antarctic Science Bellingshausen Sea Sea ice PANGAEA - Data Publisher for Earth & Environmental Science Antarctic The Antarctic Antarctic Peninsula Bellingshausen Sea ENVELOPE(-77.753167,-76.038500,-67.277000,-67.916667) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Explorer GC Gravity corer SED-01 SED-04 SED-05 SED-06 SED-07 SED-08 SED-09 SEDANO-I |
spellingShingle |
Explorer GC Gravity corer SED-01 SED-04 SED-05 SED-06 SED-07 SED-08 SED-09 SEDANO-I Pudsey, Carol J Camerlenghi, Angelo Sedimentology of cores from the Bellingshausen Sea, Antarctic |
topic_facet |
Explorer GC Gravity corer SED-01 SED-04 SED-05 SED-06 SED-07 SED-08 SED-09 SEDANO-I |
description |
On the continental rise west of the Antarctic Peninsula there are nine large mounds interpreted as sediment drifts, separated by turbidity current channels. Drift 7 is 150 km long, 70 km wide and up to 700 m high and is asymmetric, with steep sides on the south-east (towards the continent) and south-west, and gentle slopes to north-west and north-east. Cores on the gentle sides of the drift show a cyclicity between brown, bioturbated, diatom-bearing mud with foraminifera and radiolarians, and grey, laminated, barren mud. Biostratigraphic evidence is consistent with a Late Quaternary age. Detailed lithostratigraphy and magnetic susceptibility data allow precise correlation over distances of tens of kilometres. On the basis of chemostratigraphy, the brown sediment is interpreted as interglacial (isotope stages 1 and 5) and the grey as glacial (stages 2-4 and 6). Sedimentation rates are 3.0-5.5 cm/ka. Cores on the steep sides of the drift recovered a condensed section with thinner cycles and hiatuses. Fine grain size, very poor sorting and the absence of a mode in the silt size range indicate deposition from suspension with only weak current activity, There is little evidence for cyclic changes in bottom current strength. Supply of sediment to the benthic nepheloid layer was by entrainment ofmud from turbidity currents, and by settling ofpelagic material (biogenic grains, IRD, sediment suspended in meltwater plumes). Cyclic changes in sediment supply include more biogenic supply in interglacials with less sea ice cover, more terrigenous supply from turbidites in glacials with ice sheets grounded to the shelf edge, and changes in IRD content. |
format |
Dataset |
author |
Pudsey, Carol J Camerlenghi, Angelo |
author_facet |
Pudsey, Carol J Camerlenghi, Angelo |
author_sort |
Pudsey, Carol J |
title |
Sedimentology of cores from the Bellingshausen Sea, Antarctic |
title_short |
Sedimentology of cores from the Bellingshausen Sea, Antarctic |
title_full |
Sedimentology of cores from the Bellingshausen Sea, Antarctic |
title_fullStr |
Sedimentology of cores from the Bellingshausen Sea, Antarctic |
title_full_unstemmed |
Sedimentology of cores from the Bellingshausen Sea, Antarctic |
title_sort |
sedimentology of cores from the bellingshausen sea, antarctic |
publisher |
PANGAEA |
publishDate |
2007 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.671555 https://doi.org/10.1594/PANGAEA.671555 |
op_coverage |
MEDIAN LATITUDE: -67.676236 * MEDIAN LONGITUDE: -76.892792 * SOUTH-BOUND LATITUDE: -67.916667 * WEST-BOUND LONGITUDE: -77.753167 * NORTH-BOUND LATITUDE: -67.277000 * EAST-BOUND LONGITUDE: -76.038500 * DATE/TIME START: 1995-02-01T04:56:00 * DATE/TIME END: 1995-02-14T14:53:00 |
long_lat |
ENVELOPE(-77.753167,-76.038500,-67.277000,-67.916667) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Bellingshausen Sea |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Bellingshausen Sea |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Bellingshausen Sea Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Bellingshausen Sea Sea ice |
op_source |
Supplement to: Pudsey, Carol J; Camerlenghi, Angelo (1998): Glacial-interglacial deposition on a sediment drift on the Pacific margin of the Antarctic Peninsula. Antarctic Science, 10(3), 286-308, https://doi.org/10.1017/S0954102098000376 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.671555 https://doi.org/10.1594/PANGAEA.671555 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.671555 https://doi.org/10.1017/S0954102098000376 |
_version_ |
1766163260897230848 |