Circum-Antarctic continent-ocean transition zones
Antarctica was a center piece of the Gondwana supercontinent. About 85 percent of Antarcticas 10000 km long continental margins are of a rifted divergent type, and about 1200 km have been converted from a subduction-type to a passive margin after ridge-trench collision along the Pacific side of the...
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ftawi:oai:epic.awi.de:18108 2023-05-15T13:39:47+02:00 Circum-Antarctic continent-ocean transition zones Gohl, Karsten 2008 https://epic.awi.de/id/eprint/18108/ https://hdl.handle.net/10013/epic.28642 unknown Gohl, K. orcid:0000-0002-9558-2116 (2008) Circum-Antarctic continent-ocean transition zones , 23. Internationale Polartagung, 10.-14. March 2008, Münster. . hdl:10013/epic.28642 EPIC323. Internationale Polartagung, 10.-14. March 2008, Münster. Conference notRev 2008 ftawi 2021-12-24T15:32:25Z Antarctica was a center piece of the Gondwana supercontinent. About 85 percent of Antarcticas 10000 km long continental margins are of a rifted divergent type, and about 1200 km have been converted from a subduction-type to a passive margin after ridge-trench collision along the Pacific side of the Antarctic Peninsula. The separation of South America, Africa, India, Australia and New Zealand from Antarctica and the creation of a continuous Southern Ocean began in the Jurassic and continued until the mid Tertiary. In recent years, the amount of geophysical data along the continental margin of Antarctica has increased substantially, which allows to differentiate the crustal characteristics of its continent-ocean boundaries and transitional zones (COB/COT). The data and geodynamic modelling indicate that the cause, style and process of breakup and separation were quite different along the Antarctic margin. A circum-Antarctic map will show the crustal styles or the margin and the location and geophysical characteristics of the COT. About 70 percent of the rifted passive margins contain extended continental crust stretching more than 50 km oceanwards of the shelf edge. Most of these extended margins have a continent-ocean transition with a width of more than 100 km, in many cases up to 300 km. The total area of extended continental crust on the shelf and oceanwards of the shelf edge, including COTs with substantial syn-rift magmatic-volcanic accretion, can be estimated to be about 2.9 x 106 km2. This has implications for improved plate-kinematic and paleobathymetric reconstructions and provides new constraints for accurate calculations of isostatic responses along the Antarctic margin. Conference Object Antarc* Antarctic Antarctic Peninsula Antarctica Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Antarctic Peninsula New Zealand Pacific Southern Ocean The Antarctic |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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description |
Antarctica was a center piece of the Gondwana supercontinent. About 85 percent of Antarcticas 10000 km long continental margins are of a rifted divergent type, and about 1200 km have been converted from a subduction-type to a passive margin after ridge-trench collision along the Pacific side of the Antarctic Peninsula. The separation of South America, Africa, India, Australia and New Zealand from Antarctica and the creation of a continuous Southern Ocean began in the Jurassic and continued until the mid Tertiary. In recent years, the amount of geophysical data along the continental margin of Antarctica has increased substantially, which allows to differentiate the crustal characteristics of its continent-ocean boundaries and transitional zones (COB/COT). The data and geodynamic modelling indicate that the cause, style and process of breakup and separation were quite different along the Antarctic margin. A circum-Antarctic map will show the crustal styles or the margin and the location and geophysical characteristics of the COT. About 70 percent of the rifted passive margins contain extended continental crust stretching more than 50 km oceanwards of the shelf edge. Most of these extended margins have a continent-ocean transition with a width of more than 100 km, in many cases up to 300 km. The total area of extended continental crust on the shelf and oceanwards of the shelf edge, including COTs with substantial syn-rift magmatic-volcanic accretion, can be estimated to be about 2.9 x 106 km2. This has implications for improved plate-kinematic and paleobathymetric reconstructions and provides new constraints for accurate calculations of isostatic responses along the Antarctic margin. |
format |
Conference Object |
author |
Gohl, Karsten |
spellingShingle |
Gohl, Karsten Circum-Antarctic continent-ocean transition zones |
author_facet |
Gohl, Karsten |
author_sort |
Gohl, Karsten |
title |
Circum-Antarctic continent-ocean transition zones |
title_short |
Circum-Antarctic continent-ocean transition zones |
title_full |
Circum-Antarctic continent-ocean transition zones |
title_fullStr |
Circum-Antarctic continent-ocean transition zones |
title_full_unstemmed |
Circum-Antarctic continent-ocean transition zones |
title_sort |
circum-antarctic continent-ocean transition zones |
publishDate |
2008 |
url |
https://epic.awi.de/id/eprint/18108/ https://hdl.handle.net/10013/epic.28642 |
geographic |
Antarctic Antarctic Peninsula New Zealand Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula New Zealand Pacific Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Southern Ocean |
op_source |
EPIC323. Internationale Polartagung, 10.-14. March 2008, Münster. |
op_relation |
Gohl, K. orcid:0000-0002-9558-2116 (2008) Circum-Antarctic continent-ocean transition zones , 23. Internationale Polartagung, 10.-14. March 2008, Münster. . hdl:10013/epic.28642 |
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1766124387953541120 |