The sedimentary legacy of a palaeo-ice stream on the shelf of the southern Bellingshausen Sea: Clues to West Antarctic glacial history during the Late Quaternary
A major trough (Belgica Trough) eroded by a palaeo-ice stream crosses the continental shelf of the southern Bellingshausen Sea (West Antarctica) and is associated with a trough mouth fan (Belgica TMF) on the adjacent continental slope. Previous marine geophysical and geological studies investigated...
Published in: | Quaternary Science Reviews |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2010
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/22937/ https://epic.awi.de/id/eprint/22937/1/Hil2010a.pdf https://doi.org/10.1016/j.quascirev.2010.06.028 https://hdl.handle.net/10013/epic.35748 https://hdl.handle.net/10013/epic.35748.d001 |
id |
ftawi:oai:epic.awi.de:22937 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
A major trough (Belgica Trough) eroded by a palaeo-ice stream crosses the continental shelf of the southern Bellingshausen Sea (West Antarctica) and is associated with a trough mouth fan (Belgica TMF) on the adjacent continental slope. Previous marine geophysical and geological studies investigated the bathymetry and geomorphology of Belgica Trough and Belgica TMF, erosional and depositional processes associated with bedform formation, and the temporal and spatial changes in clay mineral provenance of subglacial and glaciomarine sediments.Here, we present multi-proxy data from sediment cores recovered from the shelf and uppermost slope in the southern Bellingshausen Sea and reconstruct the ice-sheet history since the last glacial maximum (LGM) in this poorly studied area of West Antarctica. We combined new data (physical properties, sedimentary structures, geochemical and grain-size data) with published data (shear strength, clay mineral assemblages) to refine a previous facies classification for the sediments. The multi-proxy approach allowed us to distinguish four main facies types and to assign them to the following depositional settings: 1) subglacial, 2) proximal grounding-line, 3) distal sub-ice shelf/sub-sea ice, and 4) seasonal open-marine. In the seasonal open-marine facies we found evidence for episodic current-induced winnowing of near-seabed sediments on the middle to outer shelf and at the uppermost slope during the late Holocene.In addition, we obtained data on excess 210Pb activity at three core sites and 44 AMS 14C dates from the acid-insoluble fraction of organic matter (AIO) and calcareous (micro-) fossils, respectively, at 12 sites. These chronological data enabled us to reconstruct, for the first time, the timing of the last advance and retreat of the West Antarctic Ice Sheet (WAIS) and the Antarctic Peninsula Ice Sheet (APIS) in the southern Bellingshausen Sea. We used the down-core variability in sediment provenance inferred from clay mineral changes to identify the most reliable AIO 14C ages for ice-sheet retreat. The palaeo-ice stream advanced through Belgica Trough after not, vert, similar36.0 corrected 14C ka before present (B.P.). It retreated from the outer shelf at not, vert, similar25.5 ka B.P., the middle shelf at not, vert, similar19.8 ka B.P., the inner shelf in Eltanin Bay at not, vert, similar12.3 ka B.P., and the inner shelf in Ronne Entrance at not, vert, similar6.3 ka B.P. The retreat of the WAIS and APIS occurred slowly and stepwise, and may still be in progress. This dynamical ice-sheet behaviour has to be taken into account for the interpretation of recent and the prediction of future mass-balance changes in the study area. The glacial history of the southern Bellingshausen Sea is unique when compared to other regions in West Antarctica, but some open questions regarding its chronology need to be addressed by future work. |
format |
Article in Journal/Newspaper |
author |
Hillenbrand, C.-D. Larter, R. D. Dowdeswell, J. A. Ehrmann, W. Ó Cofaigh, C. Benetti, S. Graham, A. G. C. Grobe, Hannes |
spellingShingle |
Hillenbrand, C.-D. Larter, R. D. Dowdeswell, J. A. Ehrmann, W. Ó Cofaigh, C. Benetti, S. Graham, A. G. C. Grobe, Hannes The sedimentary legacy of a palaeo-ice stream on the shelf of the southern Bellingshausen Sea: Clues to West Antarctic glacial history during the Late Quaternary |
author_facet |
Hillenbrand, C.-D. Larter, R. D. Dowdeswell, J. A. Ehrmann, W. Ó Cofaigh, C. Benetti, S. Graham, A. G. C. Grobe, Hannes |
author_sort |
Hillenbrand, C.-D. |
title |
The sedimentary legacy of a palaeo-ice stream on the shelf of the southern Bellingshausen Sea: Clues to West Antarctic glacial history during the Late Quaternary |
title_short |
The sedimentary legacy of a palaeo-ice stream on the shelf of the southern Bellingshausen Sea: Clues to West Antarctic glacial history during the Late Quaternary |
title_full |
The sedimentary legacy of a palaeo-ice stream on the shelf of the southern Bellingshausen Sea: Clues to West Antarctic glacial history during the Late Quaternary |
title_fullStr |
The sedimentary legacy of a palaeo-ice stream on the shelf of the southern Bellingshausen Sea: Clues to West Antarctic glacial history during the Late Quaternary |
title_full_unstemmed |
The sedimentary legacy of a palaeo-ice stream on the shelf of the southern Bellingshausen Sea: Clues to West Antarctic glacial history during the Late Quaternary |
title_sort |
sedimentary legacy of a palaeo-ice stream on the shelf of the southern bellingshausen sea: clues to west antarctic glacial history during the late quaternary |
publishDate |
2010 |
url |
https://epic.awi.de/id/eprint/22937/ https://epic.awi.de/id/eprint/22937/1/Hil2010a.pdf https://doi.org/10.1016/j.quascirev.2010.06.028 https://hdl.handle.net/10013/epic.35748 https://hdl.handle.net/10013/epic.35748.d001 |
long_lat |
ENVELOPE(-82.000,-82.000,-73.667,-73.667) ENVELOPE(-74.500,-74.500,-72.583,-72.583) |
geographic |
Antarctic The Antarctic Antarctic Peninsula West Antarctica West Antarctic Ice Sheet Bellingshausen Sea Eltanin Bay Ronne Entrance |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula West Antarctica West Antarctic Ice Sheet Bellingshausen Sea Eltanin Bay Ronne Entrance |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Bellingshausen Sea Ice Sheet Ice Shelf Ronne Entrance Sea ice West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Bellingshausen Sea Ice Sheet Ice Shelf Ronne Entrance Sea ice West Antarctica |
op_source |
EPIC3Quaternary Science Reviews, 29(19), pp. 2741-2763 |
op_relation |
https://epic.awi.de/id/eprint/22937/1/Hil2010a.pdf https://hdl.handle.net/10013/epic.35748.d001 Hillenbrand, C. D. , Larter, R. D. , Dowdeswell, J. A. , Ehrmann, W. , Ó Cofaigh, C. , Benetti, S. , Graham, A. G. C. and Grobe, H. orcid:0000-0002-4133-2218 (2010) The sedimentary legacy of a palaeo-ice stream on the shelf of the southern Bellingshausen Sea: Clues to West Antarctic glacial history during the Late Quaternary , Quaternary Science Reviews, 29 (19), pp. 2741-2763 . doi:10.1016/j.quascirev.2010.06.028 <https://doi.org/10.1016/j.quascirev.2010.06.028> , hdl:10013/epic.35748 |
op_doi |
https://doi.org/10.1016/j.quascirev.2010.06.028 |
container_title |
Quaternary Science Reviews |
container_volume |
29 |
container_issue |
19-20 |
container_start_page |
2741 |
op_container_end_page |
2763 |
_version_ |
1766245307005272064 |
spelling |
ftawi:oai:epic.awi.de:22937 2023-05-15T13:46:50+02:00 The sedimentary legacy of a palaeo-ice stream on the shelf of the southern Bellingshausen Sea: Clues to West Antarctic glacial history during the Late Quaternary Hillenbrand, C.-D. Larter, R. D. Dowdeswell, J. A. Ehrmann, W. Ó Cofaigh, C. Benetti, S. Graham, A. G. C. Grobe, Hannes 2010 application/pdf https://epic.awi.de/id/eprint/22937/ https://epic.awi.de/id/eprint/22937/1/Hil2010a.pdf https://doi.org/10.1016/j.quascirev.2010.06.028 https://hdl.handle.net/10013/epic.35748 https://hdl.handle.net/10013/epic.35748.d001 unknown https://epic.awi.de/id/eprint/22937/1/Hil2010a.pdf https://hdl.handle.net/10013/epic.35748.d001 Hillenbrand, C. D. , Larter, R. D. , Dowdeswell, J. A. , Ehrmann, W. , Ó Cofaigh, C. , Benetti, S. , Graham, A. G. C. and Grobe, H. orcid:0000-0002-4133-2218 (2010) The sedimentary legacy of a palaeo-ice stream on the shelf of the southern Bellingshausen Sea: Clues to West Antarctic glacial history during the Late Quaternary , Quaternary Science Reviews, 29 (19), pp. 2741-2763 . doi:10.1016/j.quascirev.2010.06.028 <https://doi.org/10.1016/j.quascirev.2010.06.028> , hdl:10013/epic.35748 EPIC3Quaternary Science Reviews, 29(19), pp. 2741-2763 Article isiRev 2010 ftawi https://doi.org/10.1016/j.quascirev.2010.06.028 2021-12-24T15:34:26Z A major trough (Belgica Trough) eroded by a palaeo-ice stream crosses the continental shelf of the southern Bellingshausen Sea (West Antarctica) and is associated with a trough mouth fan (Belgica TMF) on the adjacent continental slope. Previous marine geophysical and geological studies investigated the bathymetry and geomorphology of Belgica Trough and Belgica TMF, erosional and depositional processes associated with bedform formation, and the temporal and spatial changes in clay mineral provenance of subglacial and glaciomarine sediments.Here, we present multi-proxy data from sediment cores recovered from the shelf and uppermost slope in the southern Bellingshausen Sea and reconstruct the ice-sheet history since the last glacial maximum (LGM) in this poorly studied area of West Antarctica. We combined new data (physical properties, sedimentary structures, geochemical and grain-size data) with published data (shear strength, clay mineral assemblages) to refine a previous facies classification for the sediments. The multi-proxy approach allowed us to distinguish four main facies types and to assign them to the following depositional settings: 1) subglacial, 2) proximal grounding-line, 3) distal sub-ice shelf/sub-sea ice, and 4) seasonal open-marine. In the seasonal open-marine facies we found evidence for episodic current-induced winnowing of near-seabed sediments on the middle to outer shelf and at the uppermost slope during the late Holocene.In addition, we obtained data on excess 210Pb activity at three core sites and 44 AMS 14C dates from the acid-insoluble fraction of organic matter (AIO) and calcareous (micro-) fossils, respectively, at 12 sites. These chronological data enabled us to reconstruct, for the first time, the timing of the last advance and retreat of the West Antarctic Ice Sheet (WAIS) and the Antarctic Peninsula Ice Sheet (APIS) in the southern Bellingshausen Sea. We used the down-core variability in sediment provenance inferred from clay mineral changes to identify the most reliable AIO 14C ages for ice-sheet retreat. The palaeo-ice stream advanced through Belgica Trough after not, vert, similar36.0 corrected 14C ka before present (B.P.). It retreated from the outer shelf at not, vert, similar25.5 ka B.P., the middle shelf at not, vert, similar19.8 ka B.P., the inner shelf in Eltanin Bay at not, vert, similar12.3 ka B.P., and the inner shelf in Ronne Entrance at not, vert, similar6.3 ka B.P. The retreat of the WAIS and APIS occurred slowly and stepwise, and may still be in progress. This dynamical ice-sheet behaviour has to be taken into account for the interpretation of recent and the prediction of future mass-balance changes in the study area. The glacial history of the southern Bellingshausen Sea is unique when compared to other regions in West Antarctica, but some open questions regarding its chronology need to be addressed by future work. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Bellingshausen Sea Ice Sheet Ice Shelf Ronne Entrance Sea ice West Antarctica Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic The Antarctic Antarctic Peninsula West Antarctica West Antarctic Ice Sheet Bellingshausen Sea Eltanin Bay ENVELOPE(-82.000,-82.000,-73.667,-73.667) Ronne Entrance ENVELOPE(-74.500,-74.500,-72.583,-72.583) Quaternary Science Reviews 29 19-20 2741 2763 |