Morphoestructure and evolution of the central and Eastern Bransfield Basins (NW Antartic Peninsula).
The Bransfield Basin is a narrow and elongated active rift basin located between the Antarctic Peninsula and the South Shetland Islands. The Bransfield Basin is composed of three small basins, and two of them, the Central and Eastern Bransfield Basins, were surveyed during a recent cruise (GEBRA 93)...
Published in: | Marine Geophysical Researches |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
1996
|
Subjects: | |
Online Access: | http://hdl.handle.net/10508/6818 http://hdl.handle.net/10261/319366 https://doi.org/10.1007/BF00286088 |
id |
ftcsic:oai:digital.csic.es:10261/319366 |
---|---|
record_format |
openpolar |
spelling |
ftcsic:oai:digital.csic.es:10261/319366 2024-02-11T09:58:42+01:00 Morphoestructure and evolution of the central and Eastern Bransfield Basins (NW Antartic Peninsula). Gràcia, Eulàlia Canals i Artigas, Miquel Farrán, M. Prieto, M.J. Sorribas, J. Acosta-Yepes, Juan Gebra Team Antarctic Ocean Antarctic Atlantic Scotia Sea 1996 http://hdl.handle.net/10508/6818 http://hdl.handle.net/10261/319366 https://doi.org/10.1007/BF00286088 unknown Sede Central IEO https://link.springer.com/article/10.1007/BF00286088 Marine Geophysical Researches, V-18. 1996: 4229-4248 0025-3235 http://hdl.handle.net/10508/6818 http://hdl.handle.net/10261/319366 https://doi.org/10.1007/BF00286088 1659 1573-0581 none Medio Marino Sede Central IEO research article 1996 ftcsic https://doi.org/10.1007/BF00286088 2024-01-16T11:45:30Z The Bransfield Basin is a narrow and elongated active rift basin located between the Antarctic Peninsula and the South Shetland Islands. The Bransfield Basin is composed of three small basins, and two of them, the Central and Eastern Bransfield Basins, were surveyed during a recent cruise (GEBRA 93). The full swath bathymetry coverage as well as the single-channel seismic reflection and magnetic profiles that have been acquired, help us to better understand the morphostructure and recent evolution of the Bransfield Basin. Six large volcanic edifices aligned with the basin axis stick out of the sedimented seafloor of the Central Bransfield Basin. In contrast, the Eastern Bransfield Basin is characterised by four deep troughs displaying a rhombic-shape, and small, scattered volcanic cones located in the southwestern half basin. Seamount volcanism plays an important role in the formation of new crust in the Bransfield Basin. The larger seamounts of the Central Bransfield Basin are located at the intersection of the two main orthogonal sets of faults (longitudinal ENE-WSW and transversal NNW-SSE). Morphological analysis of the seamounts indicates a multi-staged volcano-tectonic construction. The distribution and shape of these edifices suggests that both volcanism and extension are concentrated at the same preferential areas through time. This might be related to the fracturation style of the continental crust. The Central and Eastern Bransfield Basins are very different in morphostructure, volcanism, and sedimentary cover. The Central Bransfield Basin shows evidence of NW-SE extensional faulting and focused active MORB-volcanism interpreted as result of incipient seafloor spreading. The Eastern Bransfield Basin is still in a rifting stage, mainly dominated by a NW-SE extension and some left-lateral strike-slip component probably related to the South Scotia Ridge. Sí Article in Journal/Newspaper Antarc* Antarctic Antarctic Ocean Antarctic Peninsula antartic* Scotia Sea South Shetland Islands Digital.CSIC (Spanish National Research Council) Antarctic The Antarctic Antarctic Peninsula Scotia Sea South Shetland Islands Antarctic Ocean South Scotia Ridge ENVELOPE(-46.500,-46.500,-60.000,-60.000) Marine Geophysical Researches 18 2-4 429 448 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
unknown |
topic |
Medio Marino Sede Central IEO |
spellingShingle |
Medio Marino Sede Central IEO Gràcia, Eulàlia Canals i Artigas, Miquel Farrán, M. Prieto, M.J. Sorribas, J. Acosta-Yepes, Juan Gebra Team Morphoestructure and evolution of the central and Eastern Bransfield Basins (NW Antartic Peninsula). |
topic_facet |
Medio Marino Sede Central IEO |
description |
The Bransfield Basin is a narrow and elongated active rift basin located between the Antarctic Peninsula and the South Shetland Islands. The Bransfield Basin is composed of three small basins, and two of them, the Central and Eastern Bransfield Basins, were surveyed during a recent cruise (GEBRA 93). The full swath bathymetry coverage as well as the single-channel seismic reflection and magnetic profiles that have been acquired, help us to better understand the morphostructure and recent evolution of the Bransfield Basin. Six large volcanic edifices aligned with the basin axis stick out of the sedimented seafloor of the Central Bransfield Basin. In contrast, the Eastern Bransfield Basin is characterised by four deep troughs displaying a rhombic-shape, and small, scattered volcanic cones located in the southwestern half basin. Seamount volcanism plays an important role in the formation of new crust in the Bransfield Basin. The larger seamounts of the Central Bransfield Basin are located at the intersection of the two main orthogonal sets of faults (longitudinal ENE-WSW and transversal NNW-SSE). Morphological analysis of the seamounts indicates a multi-staged volcano-tectonic construction. The distribution and shape of these edifices suggests that both volcanism and extension are concentrated at the same preferential areas through time. This might be related to the fracturation style of the continental crust. The Central and Eastern Bransfield Basins are very different in morphostructure, volcanism, and sedimentary cover. The Central Bransfield Basin shows evidence of NW-SE extensional faulting and focused active MORB-volcanism interpreted as result of incipient seafloor spreading. The Eastern Bransfield Basin is still in a rifting stage, mainly dominated by a NW-SE extension and some left-lateral strike-slip component probably related to the South Scotia Ridge. Sí |
format |
Article in Journal/Newspaper |
author |
Gràcia, Eulàlia Canals i Artigas, Miquel Farrán, M. Prieto, M.J. Sorribas, J. Acosta-Yepes, Juan Gebra Team |
author_facet |
Gràcia, Eulàlia Canals i Artigas, Miquel Farrán, M. Prieto, M.J. Sorribas, J. Acosta-Yepes, Juan Gebra Team |
author_sort |
Gràcia, Eulàlia |
title |
Morphoestructure and evolution of the central and Eastern Bransfield Basins (NW Antartic Peninsula). |
title_short |
Morphoestructure and evolution of the central and Eastern Bransfield Basins (NW Antartic Peninsula). |
title_full |
Morphoestructure and evolution of the central and Eastern Bransfield Basins (NW Antartic Peninsula). |
title_fullStr |
Morphoestructure and evolution of the central and Eastern Bransfield Basins (NW Antartic Peninsula). |
title_full_unstemmed |
Morphoestructure and evolution of the central and Eastern Bransfield Basins (NW Antartic Peninsula). |
title_sort |
morphoestructure and evolution of the central and eastern bransfield basins (nw antartic peninsula). |
publishDate |
1996 |
url |
http://hdl.handle.net/10508/6818 http://hdl.handle.net/10261/319366 https://doi.org/10.1007/BF00286088 |
op_coverage |
Antarctic Ocean Antarctic Atlantic Scotia Sea |
long_lat |
ENVELOPE(-46.500,-46.500,-60.000,-60.000) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Scotia Sea South Shetland Islands Antarctic Ocean South Scotia Ridge |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Scotia Sea South Shetland Islands Antarctic Ocean South Scotia Ridge |
genre |
Antarc* Antarctic Antarctic Ocean Antarctic Peninsula antartic* Scotia Sea South Shetland Islands |
genre_facet |
Antarc* Antarctic Antarctic Ocean Antarctic Peninsula antartic* Scotia Sea South Shetland Islands |
op_relation |
Sede Central IEO https://link.springer.com/article/10.1007/BF00286088 Marine Geophysical Researches, V-18. 1996: 4229-4248 0025-3235 http://hdl.handle.net/10508/6818 http://hdl.handle.net/10261/319366 https://doi.org/10.1007/BF00286088 1659 1573-0581 |
op_rights |
none |
op_doi |
https://doi.org/10.1007/BF00286088 |
container_title |
Marine Geophysical Researches |
container_volume |
18 |
container_issue |
2-4 |
container_start_page |
429 |
op_container_end_page |
448 |
_version_ |
1790594428116664320 |