Variability in Cenozoic sedimentation and paleo-water depths of the Weddell Sea basin related to pre-glacial and glacial conditions of Antarctica
The Weddell Sea basin is of particular significance for understanding climate processes, including the generation of ocean water masses and their influence on ocean circulation as well as the dynamics of the Antarctic ice sheets. The sedimentary record, preserved below the basin floor, serves as an...
Published in: | Global and Planetary Change |
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2014
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Online Access: | https://epic.awi.de/id/eprint/35325/ https://epic.awi.de/id/eprint/35325/1/Huang-etal_sedimentation-paleobathymetry-WeddellSea_GlobalPlanetaryChange_2014.pdf http://www.sciencedirect.com/science/article/pii/S0921818114000642 https://hdl.handle.net/10013/epic.43473 https://hdl.handle.net/10013/epic.43473.d001 |
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ftawi:oai:epic.awi.de:35325 2023-05-15T13:40:26+02:00 Variability in Cenozoic sedimentation and paleo-water depths of the Weddell Sea basin related to pre-glacial and glacial conditions of Antarctica Huang, Xiaoxia Gohl, Karsten Jokat, Wilfried 2014-07 application/pdf https://epic.awi.de/id/eprint/35325/ https://epic.awi.de/id/eprint/35325/1/Huang-etal_sedimentation-paleobathymetry-WeddellSea_GlobalPlanetaryChange_2014.pdf http://www.sciencedirect.com/science/article/pii/S0921818114000642 https://hdl.handle.net/10013/epic.43473 https://hdl.handle.net/10013/epic.43473.d001 unknown ELSEVIER SCIENCE BV https://epic.awi.de/id/eprint/35325/1/Huang-etal_sedimentation-paleobathymetry-WeddellSea_GlobalPlanetaryChange_2014.pdf https://hdl.handle.net/10013/epic.43473.d001 Huang, X. , Gohl, K. orcid:0000-0002-9558-2116 and Jokat, W. orcid:0000-0002-7793-5854 (2014) Variability in Cenozoic sedimentation and paleo-water depths of the Weddell Sea basin related to pre-glacial and glacial conditions of Antarctica , Global and Planetary Change, 118 , pp. 25-41 . doi:10.1016/j.gloplacha.2014.03.010 <https://doi.org/10.1016/j.gloplacha.2014.03.010> , hdl:10013/epic.43473 EPIC3Global and Planetary Change, ELSEVIER SCIENCE BV, 118, pp. 25-41, ISSN: 0921-8181 Article isiRev 2014 ftawi https://doi.org/10.1016/j.gloplacha.2014.03.010 2021-12-24T15:39:27Z The Weddell Sea basin is of particular significance for understanding climate processes, including the generation of ocean water masses and their influence on ocean circulation as well as the dynamics of the Antarctic ice sheets. The sedimentary record, preserved below the basin floor, serves as an archive of the pre-glacial to glacial development of these processes, which were accompanied by tectonic processes in its early glacial phase. Three multichannel seismic reflection transects, in total nearly 5000 km long, are used to interpret horizons and define a seismostratigraphic model for the basin. We expand this initial stratigraphic model to the greater Weddell Sea region through a network of more than 200 additional seismic lines. Information from few boreholes is used to constrain sediment ages in this stratigraphy, supported by magnetic anomalies indicating decreasing oceanic basement ages from southeast to northwest. Using these constraints, we calculate grids to depict the depths, thicknesses and sedimentation rates of pre-glacial (145–34 Ma), transitional (34–15 Ma) and full-glacial (15 Ma to present) units. These grids allow us to compare the sedimentary regimes of the pre-glacially dominated and glacially dominated stages of Weddell Sea history. The pre-glacial deposition with thicknesses of up to 5 km was controlled by the tectonic evolution and sea-floor spreading history interacting with terrigenous sediment supply. The transitional unit shows a relatively high sedimentation rate and has thicknesses of up to 3 km, which may attribute to an early formation of the East Antarctic Ice Sheet, which was partly advanced to the coast or even inner shelf. The main deposition center of the full-glacial unit lies in front of the Filchner-Ronne Ice Shelf and has sedimentation rates of up to 140–200 m/Myr, which infers that ice sheets grounded on the middle to the outer shelf and that bottom-water currents strongly impacted the sedimentation. We further calculate paleobathymetric grids at 15 Ma, 34 Ma, and 120 Ma by using a backstripping technique. Our results provide constraints for an improved understanding of the paleo-ice sheet dynamics and paleoclimate conditions of the Weddell Sea region. Article in Journal/Newspaper Antarc* Antarctic Antarctica Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Sheet Ice Shelf Ronne Ice Shelf Weddell Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic East Antarctic Ice Sheet Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) The Antarctic Weddell Weddell Sea Global and Planetary Change 118 25 41 |
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 |
The Weddell Sea basin is of particular significance for understanding climate processes, including the generation of ocean water masses and their influence on ocean circulation as well as the dynamics of the Antarctic ice sheets. The sedimentary record, preserved below the basin floor, serves as an archive of the pre-glacial to glacial development of these processes, which were accompanied by tectonic processes in its early glacial phase. Three multichannel seismic reflection transects, in total nearly 5000 km long, are used to interpret horizons and define a seismostratigraphic model for the basin. We expand this initial stratigraphic model to the greater Weddell Sea region through a network of more than 200 additional seismic lines. Information from few boreholes is used to constrain sediment ages in this stratigraphy, supported by magnetic anomalies indicating decreasing oceanic basement ages from southeast to northwest. Using these constraints, we calculate grids to depict the depths, thicknesses and sedimentation rates of pre-glacial (145–34 Ma), transitional (34–15 Ma) and full-glacial (15 Ma to present) units. These grids allow us to compare the sedimentary regimes of the pre-glacially dominated and glacially dominated stages of Weddell Sea history. The pre-glacial deposition with thicknesses of up to 5 km was controlled by the tectonic evolution and sea-floor spreading history interacting with terrigenous sediment supply. The transitional unit shows a relatively high sedimentation rate and has thicknesses of up to 3 km, which may attribute to an early formation of the East Antarctic Ice Sheet, which was partly advanced to the coast or even inner shelf. The main deposition center of the full-glacial unit lies in front of the Filchner-Ronne Ice Shelf and has sedimentation rates of up to 140–200 m/Myr, which infers that ice sheets grounded on the middle to the outer shelf and that bottom-water currents strongly impacted the sedimentation. We further calculate paleobathymetric grids at 15 Ma, 34 Ma, and 120 Ma by using a backstripping technique. Our results provide constraints for an improved understanding of the paleo-ice sheet dynamics and paleoclimate conditions of the Weddell Sea region. |
format |
Article in Journal/Newspaper |
author |
Huang, Xiaoxia Gohl, Karsten Jokat, Wilfried |
spellingShingle |
Huang, Xiaoxia Gohl, Karsten Jokat, Wilfried Variability in Cenozoic sedimentation and paleo-water depths of the Weddell Sea basin related to pre-glacial and glacial conditions of Antarctica |
author_facet |
Huang, Xiaoxia Gohl, Karsten Jokat, Wilfried |
author_sort |
Huang, Xiaoxia |
title |
Variability in Cenozoic sedimentation and paleo-water depths of the Weddell Sea basin related to pre-glacial and glacial conditions of Antarctica |
title_short |
Variability in Cenozoic sedimentation and paleo-water depths of the Weddell Sea basin related to pre-glacial and glacial conditions of Antarctica |
title_full |
Variability in Cenozoic sedimentation and paleo-water depths of the Weddell Sea basin related to pre-glacial and glacial conditions of Antarctica |
title_fullStr |
Variability in Cenozoic sedimentation and paleo-water depths of the Weddell Sea basin related to pre-glacial and glacial conditions of Antarctica |
title_full_unstemmed |
Variability in Cenozoic sedimentation and paleo-water depths of the Weddell Sea basin related to pre-glacial and glacial conditions of Antarctica |
title_sort |
variability in cenozoic sedimentation and paleo-water depths of the weddell sea basin related to pre-glacial and glacial conditions of antarctica |
publisher |
ELSEVIER SCIENCE BV |
publishDate |
2014 |
url |
https://epic.awi.de/id/eprint/35325/ https://epic.awi.de/id/eprint/35325/1/Huang-etal_sedimentation-paleobathymetry-WeddellSea_GlobalPlanetaryChange_2014.pdf http://www.sciencedirect.com/science/article/pii/S0921818114000642 https://hdl.handle.net/10013/epic.43473 https://hdl.handle.net/10013/epic.43473.d001 |
long_lat |
ENVELOPE(-61.000,-61.000,-78.500,-78.500) |
geographic |
Antarctic East Antarctic Ice Sheet Ronne Ice Shelf The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic East Antarctic Ice Sheet Ronne Ice Shelf The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctica Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Sheet Ice Shelf Ronne Ice Shelf Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Sheet Ice Shelf Ronne Ice Shelf Weddell Sea |
op_source |
EPIC3Global and Planetary Change, ELSEVIER SCIENCE BV, 118, pp. 25-41, ISSN: 0921-8181 |
op_relation |
https://epic.awi.de/id/eprint/35325/1/Huang-etal_sedimentation-paleobathymetry-WeddellSea_GlobalPlanetaryChange_2014.pdf https://hdl.handle.net/10013/epic.43473.d001 Huang, X. , Gohl, K. orcid:0000-0002-9558-2116 and Jokat, W. orcid:0000-0002-7793-5854 (2014) Variability in Cenozoic sedimentation and paleo-water depths of the Weddell Sea basin related to pre-glacial and glacial conditions of Antarctica , Global and Planetary Change, 118 , pp. 25-41 . doi:10.1016/j.gloplacha.2014.03.010 <https://doi.org/10.1016/j.gloplacha.2014.03.010> , hdl:10013/epic.43473 |
op_doi |
https://doi.org/10.1016/j.gloplacha.2014.03.010 |
container_title |
Global and Planetary Change |
container_volume |
118 |
container_start_page |
25 |
op_container_end_page |
41 |
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1766133933830832128 |