Seismic stratigraphic record of the Amundsen Sea Embayment shelf from pre-glacial to recent times: Evidence for a dynamic West Antarctic Ice Sheet
Studies of the sedimentary architecture and characteristics of the Antarctic continental margin provide clues about past ice sheet advance-retreat cycles and help improve constraints for paleo-ice dynamic models since early glacial periods. A first seismostratigraphic analysis of the Amundsen Sea Em...
Published in: | Marine Geology |
---|---|
Main Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2013
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/502396/ https://nora.nerc.ac.uk/id/eprint/502396/1/1-s2.0-S0025322713001321-main.pdf https://doi.org/10.1016/j.margeo.2013.06.011 |
id |
ftnerc:oai:nora.nerc.ac.uk:502396 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:502396 2023-05-15T13:24:01+02:00 Seismic stratigraphic record of the Amundsen Sea Embayment shelf from pre-glacial to recent times: Evidence for a dynamic West Antarctic Ice Sheet Gohl, Karsten Uenzelmann-Neben, Gabriele Larter, Robert D. Hillenbrand, Claus-Dieter Hochmuth, Katharina Kalberg, Thomas Weigelt, Estella Davy, Bryan Kuhn, Gerhard Nitsche, Frank O. 2013-10-01 text http://nora.nerc.ac.uk/id/eprint/502396/ https://nora.nerc.ac.uk/id/eprint/502396/1/1-s2.0-S0025322713001321-main.pdf https://doi.org/10.1016/j.margeo.2013.06.011 en eng https://nora.nerc.ac.uk/id/eprint/502396/1/1-s2.0-S0025322713001321-main.pdf Gohl, Karsten; Uenzelmann-Neben, Gabriele; Larter, Robert D. orcid:0000-0002-8414-7389 Hillenbrand, Claus-Dieter orcid:0000-0003-0240-7317 Hochmuth, Katharina; Kalberg, Thomas; Weigelt, Estella; Davy, Bryan; Kuhn, Gerhard; Nitsche, Frank O. 2013 Seismic stratigraphic record of the Amundsen Sea Embayment shelf from pre-glacial to recent times: Evidence for a dynamic West Antarctic Ice Sheet. Marine Geology, 344. 115-131. https://doi.org/10.1016/j.margeo.2013.06.011 <https://doi.org/10.1016/j.margeo.2013.06.011> Publication - Article PeerReviewed 2013 ftnerc https://doi.org/10.1016/j.margeo.2013.06.011 2023-02-04T19:37:17Z Studies of the sedimentary architecture and characteristics of the Antarctic continental margin provide clues about past ice sheet advance-retreat cycles and help improve constraints for paleo-ice dynamic models since early glacial periods. A first seismostratigraphic analysis of the Amundsen Sea Embayment shelf and slope of West Antarctica reveals insights into the structural architecture of the continental margin and shows stages of sediment deposition, erosion and transport reflecting the history from pre-glacial times to early glaciation and to the late Pleistocene glacial-interglacial cycles. The shelf geometry consists of a large pre- and syn-rift basin in the middle shelf region between basement cropping out on the inner shelf and buried basement ridge and highs on the outer shelf. A subordinate basin within the large basin on the mid-shelf may be associated with motion along an early West Antarctic Rift System branch. At least 4 km of pre-glacial strata have been eroded from the present inner shelf and coastal hinterland by glacial processes. Six major sedimentary units (ASS-1 to ASS-6) separated by five major erosional unconformities (ASS-u1 to ASS-u5) are distinguished from bottom to top. Unconformity ASS-u4 results from a major truncational event by glacial advance to the middle and outer shelf, which was followed by several episodes of glacial advance and retreat as observed from smaller-scale truncational unconformities within the units above ASS-u4. Some of the eroded sediments were deposited as a progradional wedge that extends the outer shelf by 25 to 65 km oceanward of the pre-glacial shelf-break. We compare the observed seismic characteristics with those of other Antarctic shelf sequences and assign an Early Cretaceous age to bottom sedimentary unit ASS-1, a Late Cretaceous to Oligocene age to unit ASS-2, an Early to Mid-Miocene age to unit ASS-3, a Mid-Miocene age to unit ASS-4, a Late Miocene to Early Pliocene age to unit ASS-5, and a Pliocene to Pleistocene age to the top unit ASS-6. Buried ... Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet West Antarctica Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic West Antarctica Amundsen Sea West Antarctic Ice Sheet Marine Geology 344 115 131 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Studies of the sedimentary architecture and characteristics of the Antarctic continental margin provide clues about past ice sheet advance-retreat cycles and help improve constraints for paleo-ice dynamic models since early glacial periods. A first seismostratigraphic analysis of the Amundsen Sea Embayment shelf and slope of West Antarctica reveals insights into the structural architecture of the continental margin and shows stages of sediment deposition, erosion and transport reflecting the history from pre-glacial times to early glaciation and to the late Pleistocene glacial-interglacial cycles. The shelf geometry consists of a large pre- and syn-rift basin in the middle shelf region between basement cropping out on the inner shelf and buried basement ridge and highs on the outer shelf. A subordinate basin within the large basin on the mid-shelf may be associated with motion along an early West Antarctic Rift System branch. At least 4 km of pre-glacial strata have been eroded from the present inner shelf and coastal hinterland by glacial processes. Six major sedimentary units (ASS-1 to ASS-6) separated by five major erosional unconformities (ASS-u1 to ASS-u5) are distinguished from bottom to top. Unconformity ASS-u4 results from a major truncational event by glacial advance to the middle and outer shelf, which was followed by several episodes of glacial advance and retreat as observed from smaller-scale truncational unconformities within the units above ASS-u4. Some of the eroded sediments were deposited as a progradional wedge that extends the outer shelf by 25 to 65 km oceanward of the pre-glacial shelf-break. We compare the observed seismic characteristics with those of other Antarctic shelf sequences and assign an Early Cretaceous age to bottom sedimentary unit ASS-1, a Late Cretaceous to Oligocene age to unit ASS-2, an Early to Mid-Miocene age to unit ASS-3, a Mid-Miocene age to unit ASS-4, a Late Miocene to Early Pliocene age to unit ASS-5, and a Pliocene to Pleistocene age to the top unit ASS-6. Buried ... |
format |
Article in Journal/Newspaper |
author |
Gohl, Karsten Uenzelmann-Neben, Gabriele Larter, Robert D. Hillenbrand, Claus-Dieter Hochmuth, Katharina Kalberg, Thomas Weigelt, Estella Davy, Bryan Kuhn, Gerhard Nitsche, Frank O. |
spellingShingle |
Gohl, Karsten Uenzelmann-Neben, Gabriele Larter, Robert D. Hillenbrand, Claus-Dieter Hochmuth, Katharina Kalberg, Thomas Weigelt, Estella Davy, Bryan Kuhn, Gerhard Nitsche, Frank O. Seismic stratigraphic record of the Amundsen Sea Embayment shelf from pre-glacial to recent times: Evidence for a dynamic West Antarctic Ice Sheet |
author_facet |
Gohl, Karsten Uenzelmann-Neben, Gabriele Larter, Robert D. Hillenbrand, Claus-Dieter Hochmuth, Katharina Kalberg, Thomas Weigelt, Estella Davy, Bryan Kuhn, Gerhard Nitsche, Frank O. |
author_sort |
Gohl, Karsten |
title |
Seismic stratigraphic record of the Amundsen Sea Embayment shelf from pre-glacial to recent times: Evidence for a dynamic West Antarctic Ice Sheet |
title_short |
Seismic stratigraphic record of the Amundsen Sea Embayment shelf from pre-glacial to recent times: Evidence for a dynamic West Antarctic Ice Sheet |
title_full |
Seismic stratigraphic record of the Amundsen Sea Embayment shelf from pre-glacial to recent times: Evidence for a dynamic West Antarctic Ice Sheet |
title_fullStr |
Seismic stratigraphic record of the Amundsen Sea Embayment shelf from pre-glacial to recent times: Evidence for a dynamic West Antarctic Ice Sheet |
title_full_unstemmed |
Seismic stratigraphic record of the Amundsen Sea Embayment shelf from pre-glacial to recent times: Evidence for a dynamic West Antarctic Ice Sheet |
title_sort |
seismic stratigraphic record of the amundsen sea embayment shelf from pre-glacial to recent times: evidence for a dynamic west antarctic ice sheet |
publishDate |
2013 |
url |
http://nora.nerc.ac.uk/id/eprint/502396/ https://nora.nerc.ac.uk/id/eprint/502396/1/1-s2.0-S0025322713001321-main.pdf https://doi.org/10.1016/j.margeo.2013.06.011 |
geographic |
Antarctic The Antarctic West Antarctica Amundsen Sea West Antarctic Ice Sheet |
geographic_facet |
Antarctic The Antarctic West Antarctica Amundsen Sea West Antarctic Ice Sheet |
genre |
Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet West Antarctica |
op_relation |
https://nora.nerc.ac.uk/id/eprint/502396/1/1-s2.0-S0025322713001321-main.pdf Gohl, Karsten; Uenzelmann-Neben, Gabriele; Larter, Robert D. orcid:0000-0002-8414-7389 Hillenbrand, Claus-Dieter orcid:0000-0003-0240-7317 Hochmuth, Katharina; Kalberg, Thomas; Weigelt, Estella; Davy, Bryan; Kuhn, Gerhard; Nitsche, Frank O. 2013 Seismic stratigraphic record of the Amundsen Sea Embayment shelf from pre-glacial to recent times: Evidence for a dynamic West Antarctic Ice Sheet. Marine Geology, 344. 115-131. https://doi.org/10.1016/j.margeo.2013.06.011 <https://doi.org/10.1016/j.margeo.2013.06.011> |
op_doi |
https://doi.org/10.1016/j.margeo.2013.06.011 |
container_title |
Marine Geology |
container_volume |
344 |
container_start_page |
115 |
op_container_end_page |
131 |
_version_ |
1766376950910156800 |