Sedimentology of the northwestern Weddell Sea continental shelf and slope
Sediment cores on two profiles oriented normaly to the continental shelf and slope, have been investigated to reconstruct the Quaternary sedimentary history of the southeast continental border of South Orkney (NW Weddell Sea). The sediments were described macroscopically and their fabric investigate...
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1992
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.782551 2023-05-15T15:42:25+02:00 Sedimentology of the northwestern Weddell Sea continental shelf and slope Brehme, Isa MEDIAN LATITUDE: -62.529378 * MEDIAN LONGITUDE: -43.909099 * SOUTH-BOUND LATITUDE: -63.506660 * WEST-BOUND LONGITUDE: -44.608330 * NORTH-BOUND LATITUDE: -61.940160 * EAST-BOUND LONGITUDE: -43.335500 * DATE/TIME START: 1983-12-12T00:00:00 * DATE/TIME END: 1987-12-26T23:28:00 1992-05-15 application/zip, 13 datasets https://doi.pangaea.de/10.1594/PANGAEA.782551 https://doi.org/10.1594/PANGAEA.782551 en eng PANGAEA Brezina, Jiri (1986): Macrogranometer (manual). GranoMetry, Heidelberger Str. 68, D-69151 Neckargemuend, Germany, 33 pp, hdl:10013/epic.50924.d001 https://doi.pangaea.de/10.1594/PANGAEA.782551 https://doi.org/10.1594/PANGAEA.782551 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Brehme, Isa (1992): Sedimentfazies und Bodenwasserstrom am Kontinentalhang des nordwestlichen Weddellmeeres (Sediment facies and bottomwater current on the continental slope in the northwestern Weddell Sea). Berichte zur Polarforschung = Reports on Polar Research, 110, 127 pp, https://doi.org/10.2312/BzP_0110_1992 ANT-II/3 ANT-VI/3 ANT-X/5 AWI_Paleo Gravity corer (Kiel type) North Atlantic Ocean Paleoenvironmental Reconstructions from Marine Sediments @ AWI PLA Plankton net Polarstern PS04 PS04/257 PS04/259 PS1170-3 PS1172-1 PS12 PS12/248 PS12/250 PS12/252 PS1575-1 PS1576-2 PS1577-1 PS22 06AQANTX_5 PS2270-3 SL South Atlantic Ocean South Orkney Dataset 1992 ftpangaea https://doi.org/10.1594/PANGAEA.782551 https://doi.org/10.2312/BzP_0110_1992 2023-01-20T07:32:33Z Sediment cores on two profiles oriented normaly to the continental shelf and slope, have been investigated to reconstruct the Quaternary sedimentary history of the southeast continental border of South Orkney (NW Weddell Sea). The sediments were described macroscopically and their fabric investigated by use of X-radiographs. Laboratory work comprised detailed grain-size analysis, determination of the watercontent, carbonate, organic carbon and sand fraction.composition. Stable oxygen and carbon isotopes have been measured On planktonic foraminifera. Palaeomagnetism, analysis of 230Th-content and detailed comparison of the lithlogic Parameters with the oxygen isotope stages (Martinson curve) were used for stratigraphic classification of the sediments. The sediment cores from the continental slope comprise a maximum age of 300,000 years B. P. Bottom currents, ice rafting and biogenic input are the main sources of sediment. Based on lithologic parameters a distinction between glacial and interglacial facies is possible. Silty clays without microfossils and few bioturbation characterise the sediments of the glacial facies. Only small amounts of icerafted debris can be recognized. This type of sediment was accumulated during times of lower sea-level and drastically reduced rate of bottom water production. Based on grain-size distribution, bottom current velocities of 0.01 cmls were calculated. Thick sea-ice coverage reduced biogenic production in the surface water, and as consequence benthic communities were depleted. Because of the reduced benthic life, sediments are only slithly bioturbated. At the beginning of the interglacial Stage, the sea-level rised rapidly, and calving rate of icebergs, combined with input of ice-rafted material, increased considerably. Sediments of this transition facies are silty cliiys with a high proportion of coarse ice-rafted debris, but without microfossils. With the onset of bottom water production in connection with shelf ice water, sediments of interglacial facies were formed. They ... Dataset Berichte zur Polarforschung North Atlantic Planktonic foraminifera Polar Research Polarforschung Reports on polar research Sea ice South Atlantic Ocean Weddell Sea PANGAEA - Data Publisher for Earth & Environmental Science Weddell Sea Weddell ENVELOPE(-44.608330,-43.335500,-61.940160,-63.506660) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
ANT-II/3 ANT-VI/3 ANT-X/5 AWI_Paleo Gravity corer (Kiel type) North Atlantic Ocean Paleoenvironmental Reconstructions from Marine Sediments @ AWI PLA Plankton net Polarstern PS04 PS04/257 PS04/259 PS1170-3 PS1172-1 PS12 PS12/248 PS12/250 PS12/252 PS1575-1 PS1576-2 PS1577-1 PS22 06AQANTX_5 PS2270-3 SL South Atlantic Ocean South Orkney |
spellingShingle |
ANT-II/3 ANT-VI/3 ANT-X/5 AWI_Paleo Gravity corer (Kiel type) North Atlantic Ocean Paleoenvironmental Reconstructions from Marine Sediments @ AWI PLA Plankton net Polarstern PS04 PS04/257 PS04/259 PS1170-3 PS1172-1 PS12 PS12/248 PS12/250 PS12/252 PS1575-1 PS1576-2 PS1577-1 PS22 06AQANTX_5 PS2270-3 SL South Atlantic Ocean South Orkney Brehme, Isa Sedimentology of the northwestern Weddell Sea continental shelf and slope |
topic_facet |
ANT-II/3 ANT-VI/3 ANT-X/5 AWI_Paleo Gravity corer (Kiel type) North Atlantic Ocean Paleoenvironmental Reconstructions from Marine Sediments @ AWI PLA Plankton net Polarstern PS04 PS04/257 PS04/259 PS1170-3 PS1172-1 PS12 PS12/248 PS12/250 PS12/252 PS1575-1 PS1576-2 PS1577-1 PS22 06AQANTX_5 PS2270-3 SL South Atlantic Ocean South Orkney |
description |
Sediment cores on two profiles oriented normaly to the continental shelf and slope, have been investigated to reconstruct the Quaternary sedimentary history of the southeast continental border of South Orkney (NW Weddell Sea). The sediments were described macroscopically and their fabric investigated by use of X-radiographs. Laboratory work comprised detailed grain-size analysis, determination of the watercontent, carbonate, organic carbon and sand fraction.composition. Stable oxygen and carbon isotopes have been measured On planktonic foraminifera. Palaeomagnetism, analysis of 230Th-content and detailed comparison of the lithlogic Parameters with the oxygen isotope stages (Martinson curve) were used for stratigraphic classification of the sediments. The sediment cores from the continental slope comprise a maximum age of 300,000 years B. P. Bottom currents, ice rafting and biogenic input are the main sources of sediment. Based on lithologic parameters a distinction between glacial and interglacial facies is possible. Silty clays without microfossils and few bioturbation characterise the sediments of the glacial facies. Only small amounts of icerafted debris can be recognized. This type of sediment was accumulated during times of lower sea-level and drastically reduced rate of bottom water production. Based on grain-size distribution, bottom current velocities of 0.01 cmls were calculated. Thick sea-ice coverage reduced biogenic production in the surface water, and as consequence benthic communities were depleted. Because of the reduced benthic life, sediments are only slithly bioturbated. At the beginning of the interglacial Stage, the sea-level rised rapidly, and calving rate of icebergs, combined with input of ice-rafted material, increased considerably. Sediments of this transition facies are silty cliiys with a high proportion of coarse ice-rafted debris, but without microfossils. With the onset of bottom water production in connection with shelf ice water, sediments of interglacial facies were formed. They ... |
format |
Dataset |
author |
Brehme, Isa |
author_facet |
Brehme, Isa |
author_sort |
Brehme, Isa |
title |
Sedimentology of the northwestern Weddell Sea continental shelf and slope |
title_short |
Sedimentology of the northwestern Weddell Sea continental shelf and slope |
title_full |
Sedimentology of the northwestern Weddell Sea continental shelf and slope |
title_fullStr |
Sedimentology of the northwestern Weddell Sea continental shelf and slope |
title_full_unstemmed |
Sedimentology of the northwestern Weddell Sea continental shelf and slope |
title_sort |
sedimentology of the northwestern weddell sea continental shelf and slope |
publisher |
PANGAEA |
publishDate |
1992 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.782551 https://doi.org/10.1594/PANGAEA.782551 |
op_coverage |
MEDIAN LATITUDE: -62.529378 * MEDIAN LONGITUDE: -43.909099 * SOUTH-BOUND LATITUDE: -63.506660 * WEST-BOUND LONGITUDE: -44.608330 * NORTH-BOUND LATITUDE: -61.940160 * EAST-BOUND LONGITUDE: -43.335500 * DATE/TIME START: 1983-12-12T00:00:00 * DATE/TIME END: 1987-12-26T23:28:00 |
long_lat |
ENVELOPE(-44.608330,-43.335500,-61.940160,-63.506660) |
geographic |
Weddell Sea Weddell |
geographic_facet |
Weddell Sea Weddell |
genre |
Berichte zur Polarforschung North Atlantic Planktonic foraminifera Polar Research Polarforschung Reports on polar research Sea ice South Atlantic Ocean Weddell Sea |
genre_facet |
Berichte zur Polarforschung North Atlantic Planktonic foraminifera Polar Research Polarforschung Reports on polar research Sea ice South Atlantic Ocean Weddell Sea |
op_source |
Supplement to: Brehme, Isa (1992): Sedimentfazies und Bodenwasserstrom am Kontinentalhang des nordwestlichen Weddellmeeres (Sediment facies and bottomwater current on the continental slope in the northwestern Weddell Sea). Berichte zur Polarforschung = Reports on Polar Research, 110, 127 pp, https://doi.org/10.2312/BzP_0110_1992 |
op_relation |
Brezina, Jiri (1986): Macrogranometer (manual). GranoMetry, Heidelberger Str. 68, D-69151 Neckargemuend, Germany, 33 pp, hdl:10013/epic.50924.d001 https://doi.pangaea.de/10.1594/PANGAEA.782551 https://doi.org/10.1594/PANGAEA.782551 |
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.782551 https://doi.org/10.2312/BzP_0110_1992 |
_version_ |
1766375959680778240 |