Structure and breakup history of the rifted margin of West Antarctica in relation to Cretaceous separation from Zealandia and Bellingshausen plate motion
Geophysical data acquired using R/V Polarstern constrain the structure and age of the rifted oceanic margin of West Antarctica. West of the Antipodes Fault, the 145 km wide continent-ocean transition zone (COTZ) of the Marie Byrd Land sector resembles a typical Atlantic-type margin. New gravity and...
Published in: | Geochemistry, Geophysics, Geosystems |
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Online Access: | https://epic.awi.de/id/eprint/25402/ https://epic.awi.de/id/eprint/25402/1/Wobbe-etal_breakup-rifting-West-Antarctic-margin_G3_2012.pdf https://hdl.handle.net/10013/epic.39211 https://hdl.handle.net/10013/epic.39211.d001 |
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ftawi:oai:epic.awi.de:25402 2023-05-15T13:46:51+02:00 Structure and breakup history of the rifted margin of West Antarctica in relation to Cretaceous separation from Zealandia and Bellingshausen plate motion Wobbe, Florian Gohl, Karsten Chambord, Amandine Sutherland, Rupert 2012-04 application/pdf https://epic.awi.de/id/eprint/25402/ https://epic.awi.de/id/eprint/25402/1/Wobbe-etal_breakup-rifting-West-Antarctic-margin_G3_2012.pdf https://hdl.handle.net/10013/epic.39211 https://hdl.handle.net/10013/epic.39211.d001 unknown Wiley https://epic.awi.de/id/eprint/25402/1/Wobbe-etal_breakup-rifting-West-Antarctic-margin_G3_2012.pdf https://hdl.handle.net/10013/epic.39211.d001 Wobbe, F. , Gohl, K. orcid:0000-0002-9558-2116 , Chambord, A. and Sutherland, R. (2012) Structure and breakup history of the rifted margin of West Antarctica in relation to Cretaceous separation from Zealandia and Bellingshausen plate motion , Geochemistry, Geophysics, Geosystems, 13 (4) . doi:10.1029/2011GC003742 <https://doi.org/10.1029/2011GC003742> , hdl:10013/epic.39211 EPIC3Geochemistry, Geophysics, Geosystems, Wiley, 13(4), ISSN: 1525-2027 Article isiRev 2012 ftawi https://doi.org/10.1029/2011GC003742 2021-12-24T15:35:25Z Geophysical data acquired using R/V Polarstern constrain the structure and age of the rifted oceanic margin of West Antarctica. West of the Antipodes Fault, the 145 km wide continent-ocean transition zone (COTZ) of the Marie Byrd Land sector resembles a typical Atlantic-type margin. New gravity and seismic reflection data indicates initial continental crust of thickness 24 km, that was stretched 90 km. Farther east, the Bellingshausen sector is broad and complex with abundant evidence for volcanism, the COTZ is c. 670 km wide, and the nature of crust within the COTZ is uncertain. Margin extension is estimated to be 106-304 km in this sector. Seafloor magnetic anomalies adjacent to Marie Byrd Land near the Pahemo Fracture Zone indicate full-spreading rate during c33-c31 (80-68 Myr) of 60 mm/yr, increasing to 74 mm/yr at c27 (62 Myr), and then dropping to 22 mm/yr by c22 (50 Myr). Spreading rates were lower to the west. Extrapolation towards the continental margin indicates initial oceanic crust formation at around c34y (84 Myr). Subsequent motion of the Bellingshausen plate relative to Antarctica (84-62 Myr) took place east of the Antipodes Fault at rates <40 mm/yr, typically 5-20 mm/yr. The high extension rate of 30-60 mm/yr during initial margin formation is consistent with steep and symmetrical margin morphology, but subsequent motion of the Bellingshausen plate was slow and complex, and modified rift morphology through migrating deformation and volcanic centres to create a broad and complex COTZ. Article in Journal/Newspaper Antarc* Antarctica Marie Byrd Land West Antarctica Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Byrd Marie Byrd Land ENVELOPE(-130.000,-130.000,-78.000,-78.000) West Antarctica Geochemistry, Geophysics, Geosystems 13 4 n/a n/a |
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 |
Geophysical data acquired using R/V Polarstern constrain the structure and age of the rifted oceanic margin of West Antarctica. West of the Antipodes Fault, the 145 km wide continent-ocean transition zone (COTZ) of the Marie Byrd Land sector resembles a typical Atlantic-type margin. New gravity and seismic reflection data indicates initial continental crust of thickness 24 km, that was stretched 90 km. Farther east, the Bellingshausen sector is broad and complex with abundant evidence for volcanism, the COTZ is c. 670 km wide, and the nature of crust within the COTZ is uncertain. Margin extension is estimated to be 106-304 km in this sector. Seafloor magnetic anomalies adjacent to Marie Byrd Land near the Pahemo Fracture Zone indicate full-spreading rate during c33-c31 (80-68 Myr) of 60 mm/yr, increasing to 74 mm/yr at c27 (62 Myr), and then dropping to 22 mm/yr by c22 (50 Myr). Spreading rates were lower to the west. Extrapolation towards the continental margin indicates initial oceanic crust formation at around c34y (84 Myr). Subsequent motion of the Bellingshausen plate relative to Antarctica (84-62 Myr) took place east of the Antipodes Fault at rates <40 mm/yr, typically 5-20 mm/yr. The high extension rate of 30-60 mm/yr during initial margin formation is consistent with steep and symmetrical margin morphology, but subsequent motion of the Bellingshausen plate was slow and complex, and modified rift morphology through migrating deformation and volcanic centres to create a broad and complex COTZ. |
format |
Article in Journal/Newspaper |
author |
Wobbe, Florian Gohl, Karsten Chambord, Amandine Sutherland, Rupert |
spellingShingle |
Wobbe, Florian Gohl, Karsten Chambord, Amandine Sutherland, Rupert Structure and breakup history of the rifted margin of West Antarctica in relation to Cretaceous separation from Zealandia and Bellingshausen plate motion |
author_facet |
Wobbe, Florian Gohl, Karsten Chambord, Amandine Sutherland, Rupert |
author_sort |
Wobbe, Florian |
title |
Structure and breakup history of the rifted margin of West Antarctica in relation to Cretaceous separation from Zealandia and Bellingshausen plate motion |
title_short |
Structure and breakup history of the rifted margin of West Antarctica in relation to Cretaceous separation from Zealandia and Bellingshausen plate motion |
title_full |
Structure and breakup history of the rifted margin of West Antarctica in relation to Cretaceous separation from Zealandia and Bellingshausen plate motion |
title_fullStr |
Structure and breakup history of the rifted margin of West Antarctica in relation to Cretaceous separation from Zealandia and Bellingshausen plate motion |
title_full_unstemmed |
Structure and breakup history of the rifted margin of West Antarctica in relation to Cretaceous separation from Zealandia and Bellingshausen plate motion |
title_sort |
structure and breakup history of the rifted margin of west antarctica in relation to cretaceous separation from zealandia and bellingshausen plate motion |
publisher |
Wiley |
publishDate |
2012 |
url |
https://epic.awi.de/id/eprint/25402/ https://epic.awi.de/id/eprint/25402/1/Wobbe-etal_breakup-rifting-West-Antarctic-margin_G3_2012.pdf https://hdl.handle.net/10013/epic.39211 https://hdl.handle.net/10013/epic.39211.d001 |
long_lat |
ENVELOPE(-130.000,-130.000,-78.000,-78.000) |
geographic |
Byrd Marie Byrd Land West Antarctica |
geographic_facet |
Byrd Marie Byrd Land West Antarctica |
genre |
Antarc* Antarctica Marie Byrd Land West Antarctica |
genre_facet |
Antarc* Antarctica Marie Byrd Land West Antarctica |
op_source |
EPIC3Geochemistry, Geophysics, Geosystems, Wiley, 13(4), ISSN: 1525-2027 |
op_relation |
https://epic.awi.de/id/eprint/25402/1/Wobbe-etal_breakup-rifting-West-Antarctic-margin_G3_2012.pdf https://hdl.handle.net/10013/epic.39211.d001 Wobbe, F. , Gohl, K. orcid:0000-0002-9558-2116 , Chambord, A. and Sutherland, R. (2012) Structure and breakup history of the rifted margin of West Antarctica in relation to Cretaceous separation from Zealandia and Bellingshausen plate motion , Geochemistry, Geophysics, Geosystems, 13 (4) . doi:10.1029/2011GC003742 <https://doi.org/10.1029/2011GC003742> , hdl:10013/epic.39211 |
op_doi |
https://doi.org/10.1029/2011GC003742 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
13 |
container_issue |
4 |
container_start_page |
n/a |
op_container_end_page |
n/a |
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1766245340678193152 |