Glaciomarine sediments and suspended particulate matter, Weddell Sea Shelf, Antarctica
Samples of glaciomarine sediments and suspended matter from the eastern and central Weddell Sea Shelf were collected during the Norwegian Antarctic Research Expedition (NARE) in 1978/79. Ice-rafted clastic materials are in general the main sediment sources. On the eastern shelf, biogenic materials a...
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Norwegian Polar Institute
2010
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ftjpolarres:oai:journals.openacademia.net:article/2542 2023-05-15T14:01:21+02:00 Glaciomarine sediments and suspended particulate matter, Weddell Sea Shelf, Antarctica Elverhøi, Anders Roaldset, Elen 2010-01-01 application/pdf https://polarresearch.net/index.php/polar/article/view/2542 https://doi.org/10.3402/polar.v1i1.6967 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/2542/5793 https://polarresearch.net/index.php/polar/article/view/2542 doi:10.3402/polar.v1i1.6967 Copyright (c) 2018 Polar Research Polar Research; Vol. 1 No. 1 (1983); 1-21 1751-8369 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2010 ftjpolarres https://doi.org/10.3402/polar.v1i1.6967 2021-11-11T19:12:57Z Samples of glaciomarine sediments and suspended matter from the eastern and central Weddell Sea Shelf were collected during the Norwegian Antarctic Research Expedition (NARE) in 1978/79. Ice-rafted clastic materials are in general the main sediment sources. On the eastern shelf, biogenic materials are abundant (sponges and bryozoan debris), Fine-grained materials, clastic and bioclastic, are additionally supported as fecal aggregates and by currents. The composition of the bottom sediments shows only small variations laterally and within the profiles. Dissolution of the biogenic materials appears to be slight. The suspended matter is dominated by fine silt and clay particles of clastic, biogenic (mainly diatoms) and authigenic (Fe. Mg-rich silicates) origin. Metalliferous particles (Fe, Ti, Zn, Cr, Ni-rich) of possibly anthropogenic an4 or cosmic origin are observed. On the upper continental slope and the outer shelf the sedimentation rates are in the range of 2-5 cm/1OOO years, which are slightly higher than for the rest of the shelf. The bioclastic glaciomarine deposits grade southward into bioclastic free sediments, showing that glaciomarine deposits outside an ice shelf may form a sequence of alternating bioclastic-rich and bioclastic-free layers. Similarly, late Precambrian carbonate tillite sequences, especially in the case of thin carbonate layers interbedded with tillite layers, may reflect variations in glaciomarine facies rather than interglaciavglacial cycles. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Shelf Polar Research Weddell Sea Polar Research (E-Journal) Antarctic Weddell Sea Weddell Polar Research 1 1 1 21 |
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Polar Research (E-Journal) |
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ftjpolarres |
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English |
description |
Samples of glaciomarine sediments and suspended matter from the eastern and central Weddell Sea Shelf were collected during the Norwegian Antarctic Research Expedition (NARE) in 1978/79. Ice-rafted clastic materials are in general the main sediment sources. On the eastern shelf, biogenic materials are abundant (sponges and bryozoan debris), Fine-grained materials, clastic and bioclastic, are additionally supported as fecal aggregates and by currents. The composition of the bottom sediments shows only small variations laterally and within the profiles. Dissolution of the biogenic materials appears to be slight. The suspended matter is dominated by fine silt and clay particles of clastic, biogenic (mainly diatoms) and authigenic (Fe. Mg-rich silicates) origin. Metalliferous particles (Fe, Ti, Zn, Cr, Ni-rich) of possibly anthropogenic an4 or cosmic origin are observed. On the upper continental slope and the outer shelf the sedimentation rates are in the range of 2-5 cm/1OOO years, which are slightly higher than for the rest of the shelf. The bioclastic glaciomarine deposits grade southward into bioclastic free sediments, showing that glaciomarine deposits outside an ice shelf may form a sequence of alternating bioclastic-rich and bioclastic-free layers. Similarly, late Precambrian carbonate tillite sequences, especially in the case of thin carbonate layers interbedded with tillite layers, may reflect variations in glaciomarine facies rather than interglaciavglacial cycles. |
format |
Article in Journal/Newspaper |
author |
Elverhøi, Anders Roaldset, Elen |
spellingShingle |
Elverhøi, Anders Roaldset, Elen Glaciomarine sediments and suspended particulate matter, Weddell Sea Shelf, Antarctica |
author_facet |
Elverhøi, Anders Roaldset, Elen |
author_sort |
Elverhøi, Anders |
title |
Glaciomarine sediments and suspended particulate matter, Weddell Sea Shelf, Antarctica |
title_short |
Glaciomarine sediments and suspended particulate matter, Weddell Sea Shelf, Antarctica |
title_full |
Glaciomarine sediments and suspended particulate matter, Weddell Sea Shelf, Antarctica |
title_fullStr |
Glaciomarine sediments and suspended particulate matter, Weddell Sea Shelf, Antarctica |
title_full_unstemmed |
Glaciomarine sediments and suspended particulate matter, Weddell Sea Shelf, Antarctica |
title_sort |
glaciomarine sediments and suspended particulate matter, weddell sea shelf, antarctica |
publisher |
Norwegian Polar Institute |
publishDate |
2010 |
url |
https://polarresearch.net/index.php/polar/article/view/2542 https://doi.org/10.3402/polar.v1i1.6967 |
geographic |
Antarctic Weddell Sea Weddell |
geographic_facet |
Antarctic Weddell Sea Weddell |
genre |
Antarc* Antarctic Antarctica Ice Shelf Polar Research Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Ice Shelf Polar Research Weddell Sea |
op_source |
Polar Research; Vol. 1 No. 1 (1983); 1-21 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/2542/5793 https://polarresearch.net/index.php/polar/article/view/2542 doi:10.3402/polar.v1i1.6967 |
op_rights |
Copyright (c) 2018 Polar Research |
op_doi |
https://doi.org/10.3402/polar.v1i1.6967 |
container_title |
Polar Research |
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1 |
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1 |
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1 |
op_container_end_page |
21 |
_version_ |
1766271086026031104 |