Distribution of oceanic crust in the Enderby Basin offshore East Antarctica
SUMMARY 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 desc...
Published in: | Geophysical Journal International |
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croxfordunivpr:10.1093/gji/ggac299 2024-09-15T17:43:05+00:00 Distribution of oceanic crust in the Enderby Basin offshore East Antarctica Altenbernd-Lang, Tabea Jokat, Wilfried Leitchenkov, German L Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research 2022 http://dx.doi.org/10.1093/gji/ggac299 https://academic.oup.com/gji/advance-article-pdf/doi/10.1093/gji/ggac299/45512738/ggac299.pdf https://academic.oup.com/gji/article-pdf/231/3/1959/45809048/ggac299.pdf en eng Oxford University Press (OUP) https://creativecommons.org/licenses/by/4.0/ Geophysical Journal International volume 231, issue 3, page 1959-1981 ISSN 0956-540X 1365-246X journal-article 2022 croxfordunivpr https://doi.org/10.1093/gji/ggac299 2024-07-08T04:23:56Z SUMMARY 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 Oxford University Press Geophysical Journal International |
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Open Polar |
collection |
Oxford University Press |
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croxfordunivpr |
language |
English |
description |
SUMMARY 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. |
author2 |
Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research |
format |
Article in Journal/Newspaper |
author |
Altenbernd-Lang, Tabea Jokat, Wilfried Leitchenkov, German L |
spellingShingle |
Altenbernd-Lang, Tabea Jokat, Wilfried Leitchenkov, German L Distribution of oceanic crust in the Enderby Basin offshore East Antarctica |
author_facet |
Altenbernd-Lang, Tabea Jokat, Wilfried Leitchenkov, German L |
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 (OUP) |
publishDate |
2022 |
url |
http://dx.doi.org/10.1093/gji/ggac299 https://academic.oup.com/gji/advance-article-pdf/doi/10.1093/gji/ggac299/45512738/ggac299.pdf https://academic.oup.com/gji/article-pdf/231/3/1959/45809048/ggac299.pdf |
genre |
Antarc* Antarctica East Antarctica Prydz Bay |
genre_facet |
Antarc* Antarctica East Antarctica Prydz Bay |
op_source |
Geophysical Journal International volume 231, issue 3, page 1959-1981 ISSN 0956-540X 1365-246X |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1093/gji/ggac299 |
container_title |
Geophysical Journal International |
_version_ |
1810489922584313856 |