The Bouvet Triple Junction
The boundaries of three plates, South America, Africa, and Antarctica, meet in a triple junction 250 km west of Bouvet Island. In the vicinity of the triple junction the most striking features of the Antarctica/South America and Africa/Antarctica plate boundaries are the Conrad and Bouvet fracture z...
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2012
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ftoceanrep:oai:oceanrep.geomar.de:44803 2023-05-15T14:11:24+02:00 The Bouvet Triple Junction Sclater, J. G. Bowin, C. Hey, R. Hoskins, H. Peirce, J. Phillips, J. Tapscott, C. 2012 text https://oceanrep.geomar.de/id/eprint/44803/ https://oceanrep.geomar.de/id/eprint/44803/1/Sclater.pdf https://doi.org/10.1029/JB081i011p01857 en eng AGU (American Geophysical Union) https://oceanrep.geomar.de/id/eprint/44803/1/Sclater.pdf Sclater, J. G., Bowin, C., Hey, R., Hoskins, H., Peirce, J., Phillips, J. and Tapscott, C. (2012) The Bouvet Triple Junction. Journal of Geophysical Research: Oceans, 81 (11). pp. 1857-1869. DOI 10.1029/JB081i011p01857 <https://doi.org/10.1029/JB081i011p01857>. doi:10.1029/JB081i011p01857 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2012 ftoceanrep https://doi.org/10.1029/JB081i011p01857 2023-04-07T15:42:17Z The boundaries of three plates, South America, Africa, and Antarctica, meet in a triple junction 250 km west of Bouvet Island. In the vicinity of the triple junction the most striking features of the Antarctica/South America and Africa/Antarctica plate boundaries are the Conrad and Bouvet fracture zones which trend N85°E and N45°E, respectively. We show by matching synthetic and observed magnetic anomaly profiles that the Antarctica/South America, Africa/Antarctica, and Africa/South America plates are moving apart at half rates of 0.90±0.1, 0.83±0.1, and 1.60±0.1 cm/yr, respectively. The rates and directions of motions for the Antarctica/South America and Africa/Antarctica plates are significantly different from those predicted by analysis of plate motions assuming global closure. The three plate boundaries meet within 10 km of 54°50′S, 00°40′W in a ridge-fault-fault (RFF) configuration. Within experimental error the relative velocity triangle closes. The triangle is isosceles, and the junction is stable. From the magnetic and topographic data we speculate that for the past 20 m.y. the triple junction has been located close to the junction of the Bouvet and Conrad fracture zones and has had a predominantly RFF configuration. Article in Journal/Newspaper Antarc* Antarctica Bouvet Island OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Bouvet ENVELOPE(3.358,3.358,-54.422,-54.422) Bouvet Island ENVELOPE(3.358,3.358,-54.422,-54.422) Journal of Geophysical Research 81 11 1857 1869 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
The boundaries of three plates, South America, Africa, and Antarctica, meet in a triple junction 250 km west of Bouvet Island. In the vicinity of the triple junction the most striking features of the Antarctica/South America and Africa/Antarctica plate boundaries are the Conrad and Bouvet fracture zones which trend N85°E and N45°E, respectively. We show by matching synthetic and observed magnetic anomaly profiles that the Antarctica/South America, Africa/Antarctica, and Africa/South America plates are moving apart at half rates of 0.90±0.1, 0.83±0.1, and 1.60±0.1 cm/yr, respectively. The rates and directions of motions for the Antarctica/South America and Africa/Antarctica plates are significantly different from those predicted by analysis of plate motions assuming global closure. The three plate boundaries meet within 10 km of 54°50′S, 00°40′W in a ridge-fault-fault (RFF) configuration. Within experimental error the relative velocity triangle closes. The triangle is isosceles, and the junction is stable. From the magnetic and topographic data we speculate that for the past 20 m.y. the triple junction has been located close to the junction of the Bouvet and Conrad fracture zones and has had a predominantly RFF configuration. |
format |
Article in Journal/Newspaper |
author |
Sclater, J. G. Bowin, C. Hey, R. Hoskins, H. Peirce, J. Phillips, J. Tapscott, C. |
spellingShingle |
Sclater, J. G. Bowin, C. Hey, R. Hoskins, H. Peirce, J. Phillips, J. Tapscott, C. The Bouvet Triple Junction |
author_facet |
Sclater, J. G. Bowin, C. Hey, R. Hoskins, H. Peirce, J. Phillips, J. Tapscott, C. |
author_sort |
Sclater, J. G. |
title |
The Bouvet Triple Junction |
title_short |
The Bouvet Triple Junction |
title_full |
The Bouvet Triple Junction |
title_fullStr |
The Bouvet Triple Junction |
title_full_unstemmed |
The Bouvet Triple Junction |
title_sort |
bouvet triple junction |
publisher |
AGU (American Geophysical Union) |
publishDate |
2012 |
url |
https://oceanrep.geomar.de/id/eprint/44803/ https://oceanrep.geomar.de/id/eprint/44803/1/Sclater.pdf https://doi.org/10.1029/JB081i011p01857 |
long_lat |
ENVELOPE(3.358,3.358,-54.422,-54.422) ENVELOPE(3.358,3.358,-54.422,-54.422) |
geographic |
Bouvet Bouvet Island |
geographic_facet |
Bouvet Bouvet Island |
genre |
Antarc* Antarctica Bouvet Island |
genre_facet |
Antarc* Antarctica Bouvet Island |
op_relation |
https://oceanrep.geomar.de/id/eprint/44803/1/Sclater.pdf Sclater, J. G., Bowin, C., Hey, R., Hoskins, H., Peirce, J., Phillips, J. and Tapscott, C. (2012) The Bouvet Triple Junction. Journal of Geophysical Research: Oceans, 81 (11). pp. 1857-1869. DOI 10.1029/JB081i011p01857 <https://doi.org/10.1029/JB081i011p01857>. doi:10.1029/JB081i011p01857 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1029/JB081i011p01857 |
container_title |
Journal of Geophysical Research |
container_volume |
81 |
container_issue |
11 |
container_start_page |
1857 |
op_container_end_page |
1869 |
_version_ |
1766283541132345344 |