Sedimentology of gravity cores from the eastern Weddell Sea, Antarctica
Sediment cores from nine sites along a profile on the Antarctic continental margin off Kapp Norvegia were analysed sedimentologicaly. The carbonate and organic carbon content, grain size distribution, composition of the coarse fraction and clay minerals were determined. d18O- and d13C-isotope ratios...
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1986
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.818905 2023-05-15T13:42:11+02:00 Sedimentology of gravity cores from the eastern Weddell Sea, Antarctica Grobe, Hannes MEDIAN LATITUDE: -70.814134 * MEDIAN LONGITUDE: -13.804519 * SOUTH-BOUND LATITUDE: -71.351700 * WEST-BOUND LONGITUDE: -13.970000 * NORTH-BOUND LATITUDE: -70.613330 * EAST-BOUND LONGITUDE: -13.408300 * DATE/TIME START: 1983-02-05T00:00:00 * DATE/TIME END: 1985-02-22T00:00:00 1986-03-26 application/zip, 19 datasets https://doi.pangaea.de/10.1594/PANGAEA.818905 https://doi.org/10.1594/PANGAEA.818905 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.818905 https://doi.org/10.1594/PANGAEA.818905 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Grobe, Hannes (1986): Spätpleistozäne Sedimentationsprozesse am antarktischen Kontinentalhang vor Kapp Norvegia, östliche Weddell See. Berichte zur Polarforschung = Reports on Polar Research, 27, 121 pp, https://doi.org/10.2312/BzP_0027_1986 AWI_Paleo Paleoenvironmental Reconstructions from Marine Sediments @ AWI Dataset 1986 ftpangaea https://doi.org/10.1594/PANGAEA.818905 https://doi.org/10.2312/BzP_0027_1986 2023-01-20T07:33:07Z Sediment cores from nine sites along a profile on the Antarctic continental margin off Kapp Norvegia were analysed sedimentologicaly. The carbonate and organic carbon content, grain size distribution, composition of the coarse fraction and clay minerals were determined. d18O- and d13C-isotope ratios were also measured. The distribution of ice rafted debris was determined by a new method. Sedimentation-rates were obtained from 230Th- and 14C-analyses. A segregation into seven different sediment facies was made possible by different sedimentological parameters, which can be attributed to different sedimentation environments and conditions. Thr profile can be divided morphologicaly into shelf, upper continental slope, slope terrace and lower continental slope. The paratill facies is deposited on the shelf during an interglacial phase and consists mainly of ice rafted sediments. A portion of the fine fraction is being carried away by the antarctic coastel current. The sedimentation rate lies between 0 and 3 cm/1000 a. The coarse grained deposits of the upper, relatively steep continental slope, were specified as a rest sediment. Current and gravity sediment transport are responsible for the intensive sorting of ice rafted material coming from the shelf. The fine sediment is carried away by currents while sand and silt are deposited as small turbidites on the slope terrace. The morainic facies only appears at the base of the upper continental slope and defines ice advances, beyond the shelf margin. The facies mainly consists of transported shelf sediments. The interglacial facies, deposited during the interglacial phases on the continental slope, are characterized by high proportions of ice raft, coarse mean grain size, low content of montmorillonite and a carbonate content, which mainly originates from planktonic foraminifera (N. pachyderma). At the central part of the slope the sedimentation rate is at its lowest (2 cm/1000 a) and increases to 3-4 cm/1000 a towards the sea, due to high production of biogenic ... Dataset Antarc* Antarctic Antarctica Berichte zur Polarforschung Planktonic foraminifera Polar Research Polarforschung Reports on polar research Weddell Sea PANGAEA - Data Publisher for Earth & Environmental Science Antarctic The Antarctic Weddell Weddell Sea ENVELOPE(-13.970000,-13.408300,-70.613330,-71.351700) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
AWI_Paleo Paleoenvironmental Reconstructions from Marine Sediments @ AWI |
spellingShingle |
AWI_Paleo Paleoenvironmental Reconstructions from Marine Sediments @ AWI Grobe, Hannes Sedimentology of gravity cores from the eastern Weddell Sea, Antarctica |
topic_facet |
AWI_Paleo Paleoenvironmental Reconstructions from Marine Sediments @ AWI |
description |
Sediment cores from nine sites along a profile on the Antarctic continental margin off Kapp Norvegia were analysed sedimentologicaly. The carbonate and organic carbon content, grain size distribution, composition of the coarse fraction and clay minerals were determined. d18O- and d13C-isotope ratios were also measured. The distribution of ice rafted debris was determined by a new method. Sedimentation-rates were obtained from 230Th- and 14C-analyses. A segregation into seven different sediment facies was made possible by different sedimentological parameters, which can be attributed to different sedimentation environments and conditions. Thr profile can be divided morphologicaly into shelf, upper continental slope, slope terrace and lower continental slope. The paratill facies is deposited on the shelf during an interglacial phase and consists mainly of ice rafted sediments. A portion of the fine fraction is being carried away by the antarctic coastel current. The sedimentation rate lies between 0 and 3 cm/1000 a. The coarse grained deposits of the upper, relatively steep continental slope, were specified as a rest sediment. Current and gravity sediment transport are responsible for the intensive sorting of ice rafted material coming from the shelf. The fine sediment is carried away by currents while sand and silt are deposited as small turbidites on the slope terrace. The morainic facies only appears at the base of the upper continental slope and defines ice advances, beyond the shelf margin. The facies mainly consists of transported shelf sediments. The interglacial facies, deposited during the interglacial phases on the continental slope, are characterized by high proportions of ice raft, coarse mean grain size, low content of montmorillonite and a carbonate content, which mainly originates from planktonic foraminifera (N. pachyderma). At the central part of the slope the sedimentation rate is at its lowest (2 cm/1000 a) and increases to 3-4 cm/1000 a towards the sea, due to high production of biogenic ... |
format |
Dataset |
author |
Grobe, Hannes |
author_facet |
Grobe, Hannes |
author_sort |
Grobe, Hannes |
title |
Sedimentology of gravity cores from the eastern Weddell Sea, Antarctica |
title_short |
Sedimentology of gravity cores from the eastern Weddell Sea, Antarctica |
title_full |
Sedimentology of gravity cores from the eastern Weddell Sea, Antarctica |
title_fullStr |
Sedimentology of gravity cores from the eastern Weddell Sea, Antarctica |
title_full_unstemmed |
Sedimentology of gravity cores from the eastern Weddell Sea, Antarctica |
title_sort |
sedimentology of gravity cores from the eastern weddell sea, antarctica |
publisher |
PANGAEA |
publishDate |
1986 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.818905 https://doi.org/10.1594/PANGAEA.818905 |
op_coverage |
MEDIAN LATITUDE: -70.814134 * MEDIAN LONGITUDE: -13.804519 * SOUTH-BOUND LATITUDE: -71.351700 * WEST-BOUND LONGITUDE: -13.970000 * NORTH-BOUND LATITUDE: -70.613330 * EAST-BOUND LONGITUDE: -13.408300 * DATE/TIME START: 1983-02-05T00:00:00 * DATE/TIME END: 1985-02-22T00:00:00 |
long_lat |
ENVELOPE(-13.970000,-13.408300,-70.613330,-71.351700) |
geographic |
Antarctic The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctica Berichte zur Polarforschung Planktonic foraminifera Polar Research Polarforschung Reports on polar research Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Berichte zur Polarforschung Planktonic foraminifera Polar Research Polarforschung Reports on polar research Weddell Sea |
op_source |
Supplement to: Grobe, Hannes (1986): Spätpleistozäne Sedimentationsprozesse am antarktischen Kontinentalhang vor Kapp Norvegia, östliche Weddell See. Berichte zur Polarforschung = Reports on Polar Research, 27, 121 pp, https://doi.org/10.2312/BzP_0027_1986 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.818905 https://doi.org/10.1594/PANGAEA.818905 |
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.818905 https://doi.org/10.2312/BzP_0027_1986 |
_version_ |
1766164534444163072 |