New insights on the post-rift seismic stratigraphic architecture and sedimentary evolution of the Antarctic Peninsula margin (Central Bransfield Basin)
16 pages, 11 figures A seismic stratigraphic study of the Antarctic Peninsula margin of the Central Bransfield Basin was conducted using seismic and bathymetric data. The study focused on seismic sequences and units deposited after the basin opened, and yield a record of the evolution of the norther...
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Online Access: | http://hdl.handle.net/10261/26432 https://doi.org/10.1016/j.margeo.2008.02.006 |
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ftcsic:oai:digital.csic.es:10261/26432 2024-02-11T09:55:51+01:00 New insights on the post-rift seismic stratigraphic architecture and sedimentary evolution of the Antarctic Peninsula margin (Central Bransfield Basin) García, Marga Ercilla, Gemma Anderson, John B. Alonso, Belén 2008-06-06 5867 bytes application/pdf http://hdl.handle.net/10261/26432 https://doi.org/10.1016/j.margeo.2008.02.006 en eng Elsevier https://doi.org/10.1016/j.margeo.2008.02.006 Marine Geology 251(3-4): 167-182 (2008) 0025-3227 http://hdl.handle.net/10261/26432 doi:10.1016/j.margeo.2008.02.006 none Antarctica Brainsfield Basin Glacial processes Glaciomarine processes artículo http://purl.org/coar/resource_type/c_6501 2008 ftcsic https://doi.org/10.1016/j.margeo.2008.02.006 2024-01-16T09:27:45Z 16 pages, 11 figures A seismic stratigraphic study of the Antarctic Peninsula margin of the Central Bransfield Basin was conducted using seismic and bathymetric data. The study focused on seismic sequences and units deposited after the basin opened, and yield a record of the evolution of the northern-most Antarctic Peninsula Ice Sheet. Two seismic sequences compose the post-rift stratigraphic succession on the Central Bransfield Basin slope platforms. Both sequences are composed of seismic units that record glacial/interglacial cycles and show evidence of the Antarctic Peninsula Ice Sheet having grounded on the continental shelf and slope platform on several occasions in the past. This evidence includes glacial and glaciomarine related sedimentary and erosional features within the seismic units (glacial unconformities, glacial troughs, till wedges, prograded wedges, trough mouth fans, gladomarine sheet deposits and moraines), which are bounded by glacial unconformities. The Antarctic Peninsula lower slope also registered in its eastern sector the deposition of gravity flow deposits during ice sheet retreat and interglacial stages. The deposition of seismic units on the middle slope produced the present-day step-like profile of the margin composed of wide flat slope platforms and narrow and steep upper and lower slopes. Seismic units show changes in thickness and distribution that record the effect of the physiography and climatic changes on margin sedimentation. These variations produced an overall change from more line-sourced deposition to more point sourced deposition as ice streams evolved. The stacking of units shows a change in the stratigraphic architecture through time, from dominantly progradational (S2) to progradational/aggradational (S1). This change is correlated with a change in the frequency of ice sheet grounding events which was probably driven by a higher rate of eustatic rise and fall in relation with the Mid Pleistocene global climatic change Data analyzed in this work were obtained by ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Digital.CSIC (Spanish National Research Council) Antarctic Antarctic Peninsula The Antarctic Marine Geology 251 3-4 167 182 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Antarctica Brainsfield Basin Glacial processes Glaciomarine processes |
spellingShingle |
Antarctica Brainsfield Basin Glacial processes Glaciomarine processes García, Marga Ercilla, Gemma Anderson, John B. Alonso, Belén New insights on the post-rift seismic stratigraphic architecture and sedimentary evolution of the Antarctic Peninsula margin (Central Bransfield Basin) |
topic_facet |
Antarctica Brainsfield Basin Glacial processes Glaciomarine processes |
description |
16 pages, 11 figures A seismic stratigraphic study of the Antarctic Peninsula margin of the Central Bransfield Basin was conducted using seismic and bathymetric data. The study focused on seismic sequences and units deposited after the basin opened, and yield a record of the evolution of the northern-most Antarctic Peninsula Ice Sheet. Two seismic sequences compose the post-rift stratigraphic succession on the Central Bransfield Basin slope platforms. Both sequences are composed of seismic units that record glacial/interglacial cycles and show evidence of the Antarctic Peninsula Ice Sheet having grounded on the continental shelf and slope platform on several occasions in the past. This evidence includes glacial and glaciomarine related sedimentary and erosional features within the seismic units (glacial unconformities, glacial troughs, till wedges, prograded wedges, trough mouth fans, gladomarine sheet deposits and moraines), which are bounded by glacial unconformities. The Antarctic Peninsula lower slope also registered in its eastern sector the deposition of gravity flow deposits during ice sheet retreat and interglacial stages. The deposition of seismic units on the middle slope produced the present-day step-like profile of the margin composed of wide flat slope platforms and narrow and steep upper and lower slopes. Seismic units show changes in thickness and distribution that record the effect of the physiography and climatic changes on margin sedimentation. These variations produced an overall change from more line-sourced deposition to more point sourced deposition as ice streams evolved. The stacking of units shows a change in the stratigraphic architecture through time, from dominantly progradational (S2) to progradational/aggradational (S1). This change is correlated with a change in the frequency of ice sheet grounding events which was probably driven by a higher rate of eustatic rise and fall in relation with the Mid Pleistocene global climatic change Data analyzed in this work were obtained by ... |
format |
Article in Journal/Newspaper |
author |
García, Marga Ercilla, Gemma Anderson, John B. Alonso, Belén |
author_facet |
García, Marga Ercilla, Gemma Anderson, John B. Alonso, Belén |
author_sort |
García, Marga |
title |
New insights on the post-rift seismic stratigraphic architecture and sedimentary evolution of the Antarctic Peninsula margin (Central Bransfield Basin) |
title_short |
New insights on the post-rift seismic stratigraphic architecture and sedimentary evolution of the Antarctic Peninsula margin (Central Bransfield Basin) |
title_full |
New insights on the post-rift seismic stratigraphic architecture and sedimentary evolution of the Antarctic Peninsula margin (Central Bransfield Basin) |
title_fullStr |
New insights on the post-rift seismic stratigraphic architecture and sedimentary evolution of the Antarctic Peninsula margin (Central Bransfield Basin) |
title_full_unstemmed |
New insights on the post-rift seismic stratigraphic architecture and sedimentary evolution of the Antarctic Peninsula margin (Central Bransfield Basin) |
title_sort |
new insights on the post-rift seismic stratigraphic architecture and sedimentary evolution of the antarctic peninsula margin (central bransfield basin) |
publisher |
Elsevier |
publishDate |
2008 |
url |
http://hdl.handle.net/10261/26432 https://doi.org/10.1016/j.margeo.2008.02.006 |
geographic |
Antarctic Antarctic Peninsula The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet |
op_relation |
https://doi.org/10.1016/j.margeo.2008.02.006 Marine Geology 251(3-4): 167-182 (2008) 0025-3227 http://hdl.handle.net/10261/26432 doi:10.1016/j.margeo.2008.02.006 |
op_rights |
none |
op_doi |
https://doi.org/10.1016/j.margeo.2008.02.006 |
container_title |
Marine Geology |
container_volume |
251 |
container_issue |
3-4 |
container_start_page |
167 |
op_container_end_page |
182 |
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1790599129706004480 |