Grain size composition of sediment cores from the Weddell Sea, Antarctica
Sedimentary processes in the southeastern Weddell Sea are influenced by glacial-interglacial ice-shelf dynamics and the cyclonic circulation of the Weddell Gyre, which affects all water masses down to the sea floor. Significantly increased sedimentation rates occur during glacial stages, when ice sh...
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Format: | Dataset |
Language: | English |
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PANGAEA
2002
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.472241 https://doi.org/10.1594/PANGAEA.472241 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.472241 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
ANT-IV/3 ANT-VI/3 ANT-VIII/5 AWI_Paleo Camp Norway gcmd1 Giant box corer GKG Gravity corer (Kiel type) Halley Bay KL Lyddan Island Paleoenvironmental Reconstructions from Marine Sediments @ AWI Piston corer (BGR type) Polarstern PS08 PS08/333 PS12 PS12/319 PS12/340 PS12/458 PS1367-2 PS1599-1 PS1599-3 PS16 PS16/409 PS16/410 PS16/419 PS1607-3 PS1635-1 PS1789-1 PS1790-1 PS1794-2 SL Weddell Sea |
spellingShingle |
ANT-IV/3 ANT-VI/3 ANT-VIII/5 AWI_Paleo Camp Norway gcmd1 Giant box corer GKG Gravity corer (Kiel type) Halley Bay KL Lyddan Island Paleoenvironmental Reconstructions from Marine Sediments @ AWI Piston corer (BGR type) Polarstern PS08 PS08/333 PS12 PS12/319 PS12/340 PS12/458 PS1367-2 PS1599-1 PS1599-3 PS16 PS16/409 PS16/410 PS16/419 PS1607-3 PS1635-1 PS1789-1 PS1790-1 PS1794-2 SL Weddell Sea Michels, Klaus Kuhn, Gerhard Hillenbrand, Claus-Dieter Diekmann, Bernhard Fütterer, Dieter K Grobe, Hannes Uenzelmann-Neben, Gabriele Grain size composition of sediment cores from the Weddell Sea, Antarctica |
topic_facet |
ANT-IV/3 ANT-VI/3 ANT-VIII/5 AWI_Paleo Camp Norway gcmd1 Giant box corer GKG Gravity corer (Kiel type) Halley Bay KL Lyddan Island Paleoenvironmental Reconstructions from Marine Sediments @ AWI Piston corer (BGR type) Polarstern PS08 PS08/333 PS12 PS12/319 PS12/340 PS12/458 PS1367-2 PS1599-1 PS1599-3 PS16 PS16/409 PS16/410 PS16/419 PS1607-3 PS1635-1 PS1789-1 PS1790-1 PS1794-2 SL Weddell Sea |
description |
Sedimentary processes in the southeastern Weddell Sea are influenced by glacial-interglacial ice-shelf dynamics and the cyclonic circulation of the Weddell Gyre, which affects all water masses down to the sea floor. Significantly increased sedimentation rates occur during glacial stages, when ice sheets advance to the shelf edge and trigger gravitational sediment transport to the deep sea. Downslope transport on the Crary Fan and off Dronning Maud and Coats Land is channelized into three huge channel systems, which originate on the eastern-, the central and the western Crary Fan. They gradually turn from a northerly direction eastward until they follow a course parallel to the continental slope. All channels show strongly asymmetric cross sections with well-developed levees on their northwestern sides, forming wedge-shaped sediment bodies. They level off very gently. Levees on the southeastern sides are small, if present at all. This characteristic morphology likely results from the process of combined turbidite-contourite deposition. Strong thermohaline currents of the Weddell Gyre entrain particles from turbidity-current suspensions, which flow down the channels, and carry them westward out of the channel where they settle on a surface gently dipping away from the channel. These sediments are intercalated with overbank deposits of high-energy and high-volume turbidity currents, which preferentially flood the left of the channels (looking downchannel) as a result of Coriolis force. In the distal setting of the easternmost channel-levee complex, where thermohaline currents are directed northeastward as a result of a recirculation of water masses from the Enderby Basin, the setting and the internal structures of a wedge-shaped sediment body indicate a contourite drift rather than a channel levee. Dating of the sediments reveals that the levees in their present form started to develop with a late Miocene cooling event, which caused an expansion of the East Antarctic Ice Sheet and an invigoration of thermohaline ... |
format |
Dataset |
author |
Michels, Klaus Kuhn, Gerhard Hillenbrand, Claus-Dieter Diekmann, Bernhard Fütterer, Dieter K Grobe, Hannes Uenzelmann-Neben, Gabriele |
author_facet |
Michels, Klaus Kuhn, Gerhard Hillenbrand, Claus-Dieter Diekmann, Bernhard Fütterer, Dieter K Grobe, Hannes Uenzelmann-Neben, Gabriele |
author_sort |
Michels, Klaus |
title |
Grain size composition of sediment cores from the Weddell Sea, Antarctica |
title_short |
Grain size composition of sediment cores from the Weddell Sea, Antarctica |
title_full |
Grain size composition of sediment cores from the Weddell Sea, Antarctica |
title_fullStr |
Grain size composition of sediment cores from the Weddell Sea, Antarctica |
title_full_unstemmed |
Grain size composition of sediment cores from the Weddell Sea, Antarctica |
title_sort |
grain size composition of sediment cores from the weddell sea, antarctica |
publisher |
PANGAEA |
publishDate |
2002 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.472241 https://doi.org/10.1594/PANGAEA.472241 |
op_coverage |
MEDIAN LATITUDE: -73.577304 * MEDIAN LONGITUDE: -26.029998 * SOUTH-BOUND LATITUDE: -74.241160 * WEST-BOUND LONGITUDE: -33.648830 * NORTH-BOUND LATITUDE: -71.869330 * EAST-BOUND LONGITUDE: -16.500000 * DATE/TIME START: 1985-12-18T23:15:00 * DATE/TIME END: 1990-01-15T00:04:00 |
long_lat |
ENVELOPE(-27.500,-27.500,-77.000,-77.000) ENVELOPE(-20.750,-20.750,-74.417,-74.417) ENVELOPE(-33.648830,-16.500000,-71.869330,-74.241160) |
geographic |
Antarctic Weddell Sea East Antarctic Ice Sheet Norway Weddell Coats Land Lyddan Island |
geographic_facet |
Antarctic Weddell Sea East Antarctic Ice Sheet Norway Weddell Coats Land Lyddan Island |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Weddell Sea |
op_source |
Supplement to: Michels, Klaus; Kuhn, Gerhard; Hillenbrand, Claus-Dieter; Diekmann, Bernhard; Fütterer, Dieter K; Grobe, Hannes; Uenzelmann-Neben, Gabriele (2002): The southern Weddell Sea: combined contourite-turbidite sedimentation at the southeastern margin of the Weddell Gyre. In: Stow, D A V; Pudsey, C; Howe, J C; Faugères, J-C & Viana, A R (eds.), Deep-water contourite systems: modern drifts and ancient series, seismic and sedimentary characteristics. Geological Society of London, Memoirs, London, 22, 305-323, hdl:10013/epic.14690.d001 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.472241 https://doi.org/10.1594/PANGAEA.472241 |
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.472241 |
_version_ |
1766163097845760000 |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.472241 2023-05-15T13:42:09+02:00 Grain size composition of sediment cores from the Weddell Sea, Antarctica Michels, Klaus Kuhn, Gerhard Hillenbrand, Claus-Dieter Diekmann, Bernhard Fütterer, Dieter K Grobe, Hannes Uenzelmann-Neben, Gabriele MEDIAN LATITUDE: -73.577304 * MEDIAN LONGITUDE: -26.029998 * SOUTH-BOUND LATITUDE: -74.241160 * WEST-BOUND LONGITUDE: -33.648830 * NORTH-BOUND LATITUDE: -71.869330 * EAST-BOUND LONGITUDE: -16.500000 * DATE/TIME START: 1985-12-18T23:15:00 * DATE/TIME END: 1990-01-15T00:04:00 2002-04-06 application/zip, 13 datasets https://doi.pangaea.de/10.1594/PANGAEA.472241 https://doi.org/10.1594/PANGAEA.472241 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.472241 https://doi.org/10.1594/PANGAEA.472241 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Michels, Klaus; Kuhn, Gerhard; Hillenbrand, Claus-Dieter; Diekmann, Bernhard; Fütterer, Dieter K; Grobe, Hannes; Uenzelmann-Neben, Gabriele (2002): The southern Weddell Sea: combined contourite-turbidite sedimentation at the southeastern margin of the Weddell Gyre. In: Stow, D A V; Pudsey, C; Howe, J C; Faugères, J-C & Viana, A R (eds.), Deep-water contourite systems: modern drifts and ancient series, seismic and sedimentary characteristics. Geological Society of London, Memoirs, London, 22, 305-323, hdl:10013/epic.14690.d001 ANT-IV/3 ANT-VI/3 ANT-VIII/5 AWI_Paleo Camp Norway gcmd1 Giant box corer GKG Gravity corer (Kiel type) Halley Bay KL Lyddan Island Paleoenvironmental Reconstructions from Marine Sediments @ AWI Piston corer (BGR type) Polarstern PS08 PS08/333 PS12 PS12/319 PS12/340 PS12/458 PS1367-2 PS1599-1 PS1599-3 PS16 PS16/409 PS16/410 PS16/419 PS1607-3 PS1635-1 PS1789-1 PS1790-1 PS1794-2 SL Weddell Sea Dataset 2002 ftpangaea https://doi.org/10.1594/PANGAEA.472241 2023-01-20T07:30:59Z Sedimentary processes in the southeastern Weddell Sea are influenced by glacial-interglacial ice-shelf dynamics and the cyclonic circulation of the Weddell Gyre, which affects all water masses down to the sea floor. Significantly increased sedimentation rates occur during glacial stages, when ice sheets advance to the shelf edge and trigger gravitational sediment transport to the deep sea. Downslope transport on the Crary Fan and off Dronning Maud and Coats Land is channelized into three huge channel systems, which originate on the eastern-, the central and the western Crary Fan. They gradually turn from a northerly direction eastward until they follow a course parallel to the continental slope. All channels show strongly asymmetric cross sections with well-developed levees on their northwestern sides, forming wedge-shaped sediment bodies. They level off very gently. Levees on the southeastern sides are small, if present at all. This characteristic morphology likely results from the process of combined turbidite-contourite deposition. Strong thermohaline currents of the Weddell Gyre entrain particles from turbidity-current suspensions, which flow down the channels, and carry them westward out of the channel where they settle on a surface gently dipping away from the channel. These sediments are intercalated with overbank deposits of high-energy and high-volume turbidity currents, which preferentially flood the left of the channels (looking downchannel) as a result of Coriolis force. In the distal setting of the easternmost channel-levee complex, where thermohaline currents are directed northeastward as a result of a recirculation of water masses from the Enderby Basin, the setting and the internal structures of a wedge-shaped sediment body indicate a contourite drift rather than a channel levee. Dating of the sediments reveals that the levees in their present form started to develop with a late Miocene cooling event, which caused an expansion of the East Antarctic Ice Sheet and an invigoration of thermohaline ... Dataset Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Weddell Sea PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Weddell Sea East Antarctic Ice Sheet Norway Weddell Coats Land ENVELOPE(-27.500,-27.500,-77.000,-77.000) Lyddan Island ENVELOPE(-20.750,-20.750,-74.417,-74.417) ENVELOPE(-33.648830,-16.500000,-71.869330,-74.241160) |