Sedimentology of two cores from the Mid-shelf eastern Amundsen Sea Embayment
Inter-ice stream areas cover significant portions of Antarctica's formerly glaciated shelves, but have been largely neglected in past geological studies because of overprinting by iceberg scours. Here, we present results of the first detailed survey of an inter-ice stream ridge from the West An...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.779863 2023-05-15T13:24:02+02:00 Sedimentology of two cores from the Mid-shelf eastern Amundsen Sea Embayment Klages, Johann Philipp Kuhn, Gerhard Hillenbrand, Claus-Dieter Graham, Alastair G C Smith, James A Larter, Robert D Gohl, Karsten MEDIAN LATITUDE: -72.769874 * MEDIAN LONGITUDE: -105.062768 * SOUTH-BOUND LATITUDE: -72.784160 * WEST-BOUND LONGITUDE: -105.104830 * NORTH-BOUND LATITUDE: -72.754160 * EAST-BOUND LONGITUDE: -105.016500 * DATE/TIME START: 2010-03-20T02:50:00 * DATE/TIME END: 2010-03-20T04:01:00 2013-02-01 application/zip, 21 datasets https://doi.pangaea.de/10.1594/PANGAEA.779863 https://doi.org/10.1594/PANGAEA.779863 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.779863 https://doi.org/10.1594/PANGAEA.779863 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Klages, Johann Philipp; Kuhn, Gerhard; Hillenbrand, Claus-Dieter; Graham, Alastair G C; Smith, James A; Larter, Robert D; Gohl, Karsten (2013): First geomorphological record and glacial history of an inter-ice stream ridge on the West Antarctic continental shelf. Quaternary Science Reviews, 61, 47-61, https://doi.org/10.1016/j.quascirev.2012.11.007 ANT-XXVI/3 AWI_Paleo Gravity corer (Kiel type) N Burke Island (flank of drumlin) N Burke Island (moraine on drumlin) Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS75 PS75/233-1 PS75/234-1 SL Dataset 2013 ftpangaea https://doi.org/10.1594/PANGAEA.779863 https://doi.org/10.1016/j.quascirev.2012.11.007 2023-01-20T07:32:30Z Inter-ice stream areas cover significant portions of Antarctica's formerly glaciated shelves, but have been largely neglected in past geological studies because of overprinting by iceberg scours. Here, we present results of the first detailed survey of an inter-ice stream ridge from the West Antarctic continental shelf. Well-preserved sub- and proglacial bedforms on the seafloor of the ridge in the eastern Amundsen Sea Embayment (ASE) provide new insights into the flow dynamics of this sector of the West Antarctic Ice Sheet (WAIS) during the Last Glacial cycle. Multibeam swath bathymetry and PARASOUND acoustic sub-bottom profiler data acquired across a mid-shelf bank, between the troughs of the Pine Island-Thwaites (PITPIS) and Cosgrove palaeo-ice streams (COPIS), reveal large-scale ribbed moraines, hill-hole pairs, terminal moraines, and crevasse-squeeze ridges. Together, these features form an assemblage of landforms that is entirely different from that in the adjacent ice-stream troughs, and appears to be unique in the context of previous studies of Antarctic seafloor geomorphology. From this assemblage, the history of ice flow and retreat from the inter-ice stream ridge is reconstructed. The bedforms indicate that ice flow was significantly slower on the inter-ice stream ridge than in the neighbouring troughs. While terminal moraines record at least two re-advances or stillstands of the ice sheet during deglaciation, an extensive field of crevasse-squeeze ridges indicates ice stagnation subsequent to re-advancing ice, which deposited the field of terminal moraines in the NE. The presented data suggest that the ice flow behaviour on the inter-ice stream ridge was substantially different from that in the adjacent troughs. However, newly obtained radiocarbon ages on two sediment cores recovered from the inter-ice stream ridge suggest a similar timing in the deglaciation of both areas. This information closes an important gap in the understanding of past WAIS behaviour in the eastern ASE. Our newly-documented ... Dataset Amundsen Sea Antarc* Antarctic Burke Island Ice Sheet Iceberg* PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Amundsen Sea West Antarctic Ice Sheet Burke Island ENVELOPE(-104.667,-104.667,-73.250,-73.250) ENVELOPE(-105.104830,-105.016500,-72.754160,-72.784160) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
ANT-XXVI/3 AWI_Paleo Gravity corer (Kiel type) N Burke Island (flank of drumlin) N Burke Island (moraine on drumlin) Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS75 PS75/233-1 PS75/234-1 SL |
spellingShingle |
ANT-XXVI/3 AWI_Paleo Gravity corer (Kiel type) N Burke Island (flank of drumlin) N Burke Island (moraine on drumlin) Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS75 PS75/233-1 PS75/234-1 SL Klages, Johann Philipp Kuhn, Gerhard Hillenbrand, Claus-Dieter Graham, Alastair G C Smith, James A Larter, Robert D Gohl, Karsten Sedimentology of two cores from the Mid-shelf eastern Amundsen Sea Embayment |
topic_facet |
ANT-XXVI/3 AWI_Paleo Gravity corer (Kiel type) N Burke Island (flank of drumlin) N Burke Island (moraine on drumlin) Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS75 PS75/233-1 PS75/234-1 SL |
description |
Inter-ice stream areas cover significant portions of Antarctica's formerly glaciated shelves, but have been largely neglected in past geological studies because of overprinting by iceberg scours. Here, we present results of the first detailed survey of an inter-ice stream ridge from the West Antarctic continental shelf. Well-preserved sub- and proglacial bedforms on the seafloor of the ridge in the eastern Amundsen Sea Embayment (ASE) provide new insights into the flow dynamics of this sector of the West Antarctic Ice Sheet (WAIS) during the Last Glacial cycle. Multibeam swath bathymetry and PARASOUND acoustic sub-bottom profiler data acquired across a mid-shelf bank, between the troughs of the Pine Island-Thwaites (PITPIS) and Cosgrove palaeo-ice streams (COPIS), reveal large-scale ribbed moraines, hill-hole pairs, terminal moraines, and crevasse-squeeze ridges. Together, these features form an assemblage of landforms that is entirely different from that in the adjacent ice-stream troughs, and appears to be unique in the context of previous studies of Antarctic seafloor geomorphology. From this assemblage, the history of ice flow and retreat from the inter-ice stream ridge is reconstructed. The bedforms indicate that ice flow was significantly slower on the inter-ice stream ridge than in the neighbouring troughs. While terminal moraines record at least two re-advances or stillstands of the ice sheet during deglaciation, an extensive field of crevasse-squeeze ridges indicates ice stagnation subsequent to re-advancing ice, which deposited the field of terminal moraines in the NE. The presented data suggest that the ice flow behaviour on the inter-ice stream ridge was substantially different from that in the adjacent troughs. However, newly obtained radiocarbon ages on two sediment cores recovered from the inter-ice stream ridge suggest a similar timing in the deglaciation of both areas. This information closes an important gap in the understanding of past WAIS behaviour in the eastern ASE. Our newly-documented ... |
format |
Dataset |
author |
Klages, Johann Philipp Kuhn, Gerhard Hillenbrand, Claus-Dieter Graham, Alastair G C Smith, James A Larter, Robert D Gohl, Karsten |
author_facet |
Klages, Johann Philipp Kuhn, Gerhard Hillenbrand, Claus-Dieter Graham, Alastair G C Smith, James A Larter, Robert D Gohl, Karsten |
author_sort |
Klages, Johann Philipp |
title |
Sedimentology of two cores from the Mid-shelf eastern Amundsen Sea Embayment |
title_short |
Sedimentology of two cores from the Mid-shelf eastern Amundsen Sea Embayment |
title_full |
Sedimentology of two cores from the Mid-shelf eastern Amundsen Sea Embayment |
title_fullStr |
Sedimentology of two cores from the Mid-shelf eastern Amundsen Sea Embayment |
title_full_unstemmed |
Sedimentology of two cores from the Mid-shelf eastern Amundsen Sea Embayment |
title_sort |
sedimentology of two cores from the mid-shelf eastern amundsen sea embayment |
publisher |
PANGAEA |
publishDate |
2013 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.779863 https://doi.org/10.1594/PANGAEA.779863 |
op_coverage |
MEDIAN LATITUDE: -72.769874 * MEDIAN LONGITUDE: -105.062768 * SOUTH-BOUND LATITUDE: -72.784160 * WEST-BOUND LONGITUDE: -105.104830 * NORTH-BOUND LATITUDE: -72.754160 * EAST-BOUND LONGITUDE: -105.016500 * DATE/TIME START: 2010-03-20T02:50:00 * DATE/TIME END: 2010-03-20T04:01:00 |
long_lat |
ENVELOPE(-104.667,-104.667,-73.250,-73.250) ENVELOPE(-105.104830,-105.016500,-72.754160,-72.784160) |
geographic |
Antarctic Amundsen Sea West Antarctic Ice Sheet Burke Island |
geographic_facet |
Antarctic Amundsen Sea West Antarctic Ice Sheet Burke Island |
genre |
Amundsen Sea Antarc* Antarctic Burke Island Ice Sheet Iceberg* |
genre_facet |
Amundsen Sea Antarc* Antarctic Burke Island Ice Sheet Iceberg* |
op_source |
Supplement to: Klages, Johann Philipp; Kuhn, Gerhard; Hillenbrand, Claus-Dieter; Graham, Alastair G C; Smith, James A; Larter, Robert D; Gohl, Karsten (2013): First geomorphological record and glacial history of an inter-ice stream ridge on the West Antarctic continental shelf. Quaternary Science Reviews, 61, 47-61, https://doi.org/10.1016/j.quascirev.2012.11.007 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.779863 https://doi.org/10.1594/PANGAEA.779863 |
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.779863 https://doi.org/10.1016/j.quascirev.2012.11.007 |
_version_ |
1766377110259105792 |