Distribution of oceanic crust in the Enderby Basin offshore East Antarctica
Seismic reflection and refraction data were collected in 2007 and 2012 to reveal the crustal fabric on a single long composite profile offshore Prydz Bay, East Antarctica. A P-wave velocity model provides insights on the crustal fabric, and a gravity-constrained density model is used to describe the...
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Oxford University Press
2022
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Online Access: | https://epic.awi.de/id/eprint/56846/ https://epic.awi.de/id/eprint/56846/1/Altenbernd-Lang_et_al_2022.pdf https://hdl.handle.net/10013/epic.5ed644b0-ed60-4398-8890-923bdd1edcd6 |
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ftawi:oai:epic.awi.de:56846 2024-09-09T19:06:35+00:00 Distribution of oceanic crust in the Enderby Basin offshore East Antarctica Altenbernd-Lang, Tabea Jokat, Wilfried Leitchenkov, German 2022-08-24 application/pdf https://epic.awi.de/id/eprint/56846/ https://epic.awi.de/id/eprint/56846/1/Altenbernd-Lang_et_al_2022.pdf https://hdl.handle.net/10013/epic.5ed644b0-ed60-4398-8890-923bdd1edcd6 unknown Oxford University Press https://epic.awi.de/id/eprint/56846/1/Altenbernd-Lang_et_al_2022.pdf Altenbernd-Lang, T. orcid:0000-0002-2295-9250 , Jokat, W. orcid:0000-0002-7793-5854 and Leitchenkov, G. orcid:0000-0001-6316-8511 (2022) Distribution of oceanic crust in the Enderby Basin offshore East Antarctica , Geophysical Journal International, 231 , pp. 1959-1981 . doi:10.1093/gji/ggac299 <https://doi.org/10.1093/gji%2Fggac299> , hdl:10013/epic.5ed644b0-ed60-4398-8890-923bdd1edcd6 EPIC3Geophysical Journal International, Oxford University Press, 231, pp. 1959-1981 Article isiRev 2022 ftawi https://doi.org/10.1093/gji/ggac299 2024-06-24T04:28:46Z Seismic reflection and refraction data were collected in 2007 and 2012 to reveal the crustal fabric on a single long composite profile offshore Prydz Bay, East Antarctica. A P-wave velocity model provides insights on the crustal fabric, and a gravity-constrained density model is used to describe the crustal and mantle structure. The models show that a 230-km- wide continent–ocean transition separates stretched continental from oceanic crust along our profile. While the oceanic crust close to the continent–ocean boundary is just 3.5–5 km thick, its thickness increases northwards towards the Southern Kerguelen Plateau to 12 km. This change is accompanied by thickening of a lower crustal layer with high P-wave velocities of up to 7.5 km s–1, marking intrusive rocks emplaced beneath the mid-ocean ridge under increasing influence of the Kerguelen plume. Joint interpretations of our crustal model, seismic reflection data and magnetic data sets constrain the age and extent of oceanic crust in the research area. Oceanic crust is shown to continue to around 160 km farther south than has been interpreted in previous data, with profound implications for plate kinematic models of the region. Finally, by combining our findings with a regional magnetic data compilation and regional seismic reflection data we propose a larger extent of oceanic crust in the Enderby Basin than previously known. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Prydz Bay Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) East Antarctica Kerguelen Prydz Bay Geophysical Journal International 231 3 1959 1981 |
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 |
Seismic reflection and refraction data were collected in 2007 and 2012 to reveal the crustal fabric on a single long composite profile offshore Prydz Bay, East Antarctica. A P-wave velocity model provides insights on the crustal fabric, and a gravity-constrained density model is used to describe the crustal and mantle structure. The models show that a 230-km- wide continent–ocean transition separates stretched continental from oceanic crust along our profile. While the oceanic crust close to the continent–ocean boundary is just 3.5–5 km thick, its thickness increases northwards towards the Southern Kerguelen Plateau to 12 km. This change is accompanied by thickening of a lower crustal layer with high P-wave velocities of up to 7.5 km s–1, marking intrusive rocks emplaced beneath the mid-ocean ridge under increasing influence of the Kerguelen plume. Joint interpretations of our crustal model, seismic reflection data and magnetic data sets constrain the age and extent of oceanic crust in the research area. Oceanic crust is shown to continue to around 160 km farther south than has been interpreted in previous data, with profound implications for plate kinematic models of the region. Finally, by combining our findings with a regional magnetic data compilation and regional seismic reflection data we propose a larger extent of oceanic crust in the Enderby Basin than previously known. |
format |
Article in Journal/Newspaper |
author |
Altenbernd-Lang, Tabea Jokat, Wilfried Leitchenkov, German |
spellingShingle |
Altenbernd-Lang, Tabea Jokat, Wilfried Leitchenkov, German Distribution of oceanic crust in the Enderby Basin offshore East Antarctica |
author_facet |
Altenbernd-Lang, Tabea Jokat, Wilfried Leitchenkov, German |
author_sort |
Altenbernd-Lang, Tabea |
title |
Distribution of oceanic crust in the Enderby Basin offshore East Antarctica |
title_short |
Distribution of oceanic crust in the Enderby Basin offshore East Antarctica |
title_full |
Distribution of oceanic crust in the Enderby Basin offshore East Antarctica |
title_fullStr |
Distribution of oceanic crust in the Enderby Basin offshore East Antarctica |
title_full_unstemmed |
Distribution of oceanic crust in the Enderby Basin offshore East Antarctica |
title_sort |
distribution of oceanic crust in the enderby basin offshore east antarctica |
publisher |
Oxford University Press |
publishDate |
2022 |
url |
https://epic.awi.de/id/eprint/56846/ https://epic.awi.de/id/eprint/56846/1/Altenbernd-Lang_et_al_2022.pdf https://hdl.handle.net/10013/epic.5ed644b0-ed60-4398-8890-923bdd1edcd6 |
geographic |
East Antarctica Kerguelen Prydz Bay |
geographic_facet |
East Antarctica Kerguelen Prydz Bay |
genre |
Antarc* Antarctica East Antarctica Prydz Bay |
genre_facet |
Antarc* Antarctica East Antarctica Prydz Bay |
op_source |
EPIC3Geophysical Journal International, Oxford University Press, 231, pp. 1959-1981 |
op_relation |
https://epic.awi.de/id/eprint/56846/1/Altenbernd-Lang_et_al_2022.pdf Altenbernd-Lang, T. orcid:0000-0002-2295-9250 , Jokat, W. orcid:0000-0002-7793-5854 and Leitchenkov, G. orcid:0000-0001-6316-8511 (2022) Distribution of oceanic crust in the Enderby Basin offshore East Antarctica , Geophysical Journal International, 231 , pp. 1959-1981 . doi:10.1093/gji/ggac299 <https://doi.org/10.1093/gji%2Fggac299> , hdl:10013/epic.5ed644b0-ed60-4398-8890-923bdd1edcd6 |
op_doi |
https://doi.org/10.1093/gji/ggac299 |
container_title |
Geophysical Journal International |
container_volume |
231 |
container_issue |
3 |
container_start_page |
1959 |
op_container_end_page |
1981 |
_version_ |
1809820654018494464 |