Seismic stratigraphic evidence for glacial-interglacial cyclicity in the ASE since Neogene time
Multichannel seismic reflection profiles provide a record of the glacial development in the western Amundsen Sea Embayment during the Neogene. We identified a northwest-dipping reflector series of more than 1 s TWT thickness (> 800 m) on the middle continental shelf indicating well-layered sedime...
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ftawi:oai:epic.awi.de:21522 2023-05-15T13:22:43+02:00 Seismic stratigraphic evidence for glacial-interglacial cyclicity in the ASE since Neogene time Weigelt, Estella Gohl, Karsten Uenzelmann-Neben, Gabriele Larter, R. 2009 https://epic.awi.de/id/eprint/21522/ https://hdl.handle.net/10013/epic.33837 unknown Weigelt, E. orcid:0000-0003-1598-456X , Gohl, K. orcid:0000-0002-9558-2116 , Uenzelmann-Neben, G. orcid:0000-0002-0115-5923 and Larter, R. (2009) Seismic stratigraphic evidence for glacial-interglacial cyclicity in the ASE since Neogene time , ACE Symposium Workshop, Amundsen Sea Embayment: Tectonic and Climate Evolution, Granada, Sep 7-13. . hdl:10013/epic.33837 EPIC3ACE Symposium Workshop, Amundsen Sea Embayment: Tectonic and Climate Evolution, Granada, Sep 7-13. Conference notRev 2009 ftawi 2021-12-24T15:33:51Z Multichannel seismic reflection profiles provide a record of the glacial development in the western Amundsen Sea Embayment during the Neogene. We identified a northwest-dipping reflector series of more than 1 s TWT thickness (> 800 m) on the middle continental shelf indicating well-layered sedimentary units. The dipping strata reveal a striking alternation of reflection-poor, almost transparent units and sequences of closely spaced, continuous reflectors. We suggest that the distinct changes in reflection character represent episodes of ice sheet advance and retreat forced by climate changes. The similarity to seismo-stratigraphic records from the Ross Sea suggests that dipping strata have accumulated since the Miocene. A major problem is to define the age of the dipping strata and with it the episodes of ice sheet extension because drill sites do not exist within the Amundsen Basin. Therefore a future research priority will be the collection of a series of core samples. The outcrop of layers along large parts of the shelf and the shallow water depth provide a favorable base for shallow drilling. Conference Object amundsen basin Amundsen Sea Ice Sheet Ross Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Amundsen Sea Ross Sea |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
Multichannel seismic reflection profiles provide a record of the glacial development in the western Amundsen Sea Embayment during the Neogene. We identified a northwest-dipping reflector series of more than 1 s TWT thickness (> 800 m) on the middle continental shelf indicating well-layered sedimentary units. The dipping strata reveal a striking alternation of reflection-poor, almost transparent units and sequences of closely spaced, continuous reflectors. We suggest that the distinct changes in reflection character represent episodes of ice sheet advance and retreat forced by climate changes. The similarity to seismo-stratigraphic records from the Ross Sea suggests that dipping strata have accumulated since the Miocene. A major problem is to define the age of the dipping strata and with it the episodes of ice sheet extension because drill sites do not exist within the Amundsen Basin. Therefore a future research priority will be the collection of a series of core samples. The outcrop of layers along large parts of the shelf and the shallow water depth provide a favorable base for shallow drilling. |
format |
Conference Object |
author |
Weigelt, Estella Gohl, Karsten Uenzelmann-Neben, Gabriele Larter, R. |
spellingShingle |
Weigelt, Estella Gohl, Karsten Uenzelmann-Neben, Gabriele Larter, R. Seismic stratigraphic evidence for glacial-interglacial cyclicity in the ASE since Neogene time |
author_facet |
Weigelt, Estella Gohl, Karsten Uenzelmann-Neben, Gabriele Larter, R. |
author_sort |
Weigelt, Estella |
title |
Seismic stratigraphic evidence for glacial-interglacial cyclicity in the ASE since Neogene time |
title_short |
Seismic stratigraphic evidence for glacial-interglacial cyclicity in the ASE since Neogene time |
title_full |
Seismic stratigraphic evidence for glacial-interglacial cyclicity in the ASE since Neogene time |
title_fullStr |
Seismic stratigraphic evidence for glacial-interglacial cyclicity in the ASE since Neogene time |
title_full_unstemmed |
Seismic stratigraphic evidence for glacial-interglacial cyclicity in the ASE since Neogene time |
title_sort |
seismic stratigraphic evidence for glacial-interglacial cyclicity in the ase since neogene time |
publishDate |
2009 |
url |
https://epic.awi.de/id/eprint/21522/ https://hdl.handle.net/10013/epic.33837 |
geographic |
Amundsen Sea Ross Sea |
geographic_facet |
Amundsen Sea Ross Sea |
genre |
amundsen basin Amundsen Sea Ice Sheet Ross Sea |
genre_facet |
amundsen basin Amundsen Sea Ice Sheet Ross Sea |
op_source |
EPIC3ACE Symposium Workshop, Amundsen Sea Embayment: Tectonic and Climate Evolution, Granada, Sep 7-13. |
op_relation |
Weigelt, E. orcid:0000-0003-1598-456X , Gohl, K. orcid:0000-0002-9558-2116 , Uenzelmann-Neben, G. orcid:0000-0002-0115-5923 and Larter, R. (2009) Seismic stratigraphic evidence for glacial-interglacial cyclicity in the ASE since Neogene time , ACE Symposium Workshop, Amundsen Sea Embayment: Tectonic and Climate Evolution, Granada, Sep 7-13. . hdl:10013/epic.33837 |
_version_ |
1766366537567961088 |