Tectonic development of the Bransfield Basin and its prolongation to the South Scotia Ridge, northern Antarctic Peninsula
The Bransfield Basin is located off the northern tip of the Antarctic Peninsula. The analysis of multichannel seismic reflection profiles allows the shallow structure of the Bransfield Basin and its eastwards prolongation through the Scotia Sea to be imaged. The Bransfield Basin is asymmetrical, wit...
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Online Access: | http://hdl.handle.net/10261/19759 https://doi.org/10.1016/j.margeo.2004.02.007 |
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ftcsic:oai:digital.csic.es:10261/19759 2024-02-11T09:56:31+01:00 Tectonic development of the Bransfield Basin and its prolongation to the South Scotia Ridge, northern Antarctic Peninsula Galindo Zaldívar, Jesús Gamboa, Luiz Maldonado, Andrés Nakao, Seizo Bochu, Yao 2004-05-31 579917 bytes image/jpeg http://hdl.handle.net/10261/19759 https://doi.org/10.1016/j.margeo.2004.02.007 en eng Elsevier http://dx.doi.org/10.1016/j.margeo.2004.02.007 Marine Geology 206(1-4): 267-282 (2004) 0025-3227 http://hdl.handle.net/10261/19759 doi:10.1016/j.margeo.2004.02.007 none Bransfield Basin Continental blocks Backarc basin Transcurrent faults Roll-back artículo http://purl.org/coar/resource_type/c_6501 2004 ftcsic https://doi.org/10.1016/j.margeo.2004.02.007 2024-01-16T09:24:55Z The Bransfield Basin is located off the northern tip of the Antarctic Peninsula. The analysis of multichannel seismic reflection profiles allows the shallow structure of the Bransfield Basin and its eastwards prolongation through the Scotia Sea to be imaged. The Bransfield Basin is asymmetrical, with most of the sediment input coming from the passive Antarctic Peninsula margin, which is deformed by normal faults generally dipping less than 45° northwestwards. Much less sediment comes from the conjugate South Shetland Islands margin, which is dominated by high-angle normal faults, generally dipping between 45° and 60°, constituting the inner boundary of the South Shetland Block tectonic horst. The detachment and moving apart of the South Shetland Block from the Antarctic Peninsula led to the opening of the Bransfield Basin, where incipient oceanic spreading has been reported previously. The South Shetland Block outer boundary to the northwest is made of the South Shetland Trench, which to the east passes into the sinistral transpressive Scotia–Antarctic plate boundary marked by the prominent South Scotia Ridge. Following cessation of spreading in the Phoenix–Antarctic Ridge northwest of the South Shetland Block during middle Pliocene, roll-back played a major role in the development of the Bransfield Basin, with maximum extension in the Central subbasin. In addition, the Eastern Bransfield Basin accommodates most of the sinistral transtensional deformation along the South Scotia Ridge. Normal and reverse faults were simultaneously active along the inner and outer boundaries, respectively, of the continental crust fragment constituting the South Shetland Block. The development of the Bransfield Basin offers a good example of the tectonic processes involved in continental fragmentation associated with backarc basin development. CAPES-Brasil and Projects ANT99-0817 and REN2001-2143/ANT supported this contribution Peer reviewed Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Scotia Sea South Shetland Islands Digital.CSIC (Spanish National Research Council) Antarctic The Antarctic Antarctic Peninsula Scotia Sea South Shetland Islands South Scotia Ridge ENVELOPE(-46.500,-46.500,-60.000,-60.000) South Shetland Trench ENVELOPE(-59.500,-59.500,-61.000,-61.000) Marine Geology 206 1-4 267 282 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Bransfield Basin Continental blocks Backarc basin Transcurrent faults Roll-back |
spellingShingle |
Bransfield Basin Continental blocks Backarc basin Transcurrent faults Roll-back Galindo Zaldívar, Jesús Gamboa, Luiz Maldonado, Andrés Nakao, Seizo Bochu, Yao Tectonic development of the Bransfield Basin and its prolongation to the South Scotia Ridge, northern Antarctic Peninsula |
topic_facet |
Bransfield Basin Continental blocks Backarc basin Transcurrent faults Roll-back |
description |
The Bransfield Basin is located off the northern tip of the Antarctic Peninsula. The analysis of multichannel seismic reflection profiles allows the shallow structure of the Bransfield Basin and its eastwards prolongation through the Scotia Sea to be imaged. The Bransfield Basin is asymmetrical, with most of the sediment input coming from the passive Antarctic Peninsula margin, which is deformed by normal faults generally dipping less than 45° northwestwards. Much less sediment comes from the conjugate South Shetland Islands margin, which is dominated by high-angle normal faults, generally dipping between 45° and 60°, constituting the inner boundary of the South Shetland Block tectonic horst. The detachment and moving apart of the South Shetland Block from the Antarctic Peninsula led to the opening of the Bransfield Basin, where incipient oceanic spreading has been reported previously. The South Shetland Block outer boundary to the northwest is made of the South Shetland Trench, which to the east passes into the sinistral transpressive Scotia–Antarctic plate boundary marked by the prominent South Scotia Ridge. Following cessation of spreading in the Phoenix–Antarctic Ridge northwest of the South Shetland Block during middle Pliocene, roll-back played a major role in the development of the Bransfield Basin, with maximum extension in the Central subbasin. In addition, the Eastern Bransfield Basin accommodates most of the sinistral transtensional deformation along the South Scotia Ridge. Normal and reverse faults were simultaneously active along the inner and outer boundaries, respectively, of the continental crust fragment constituting the South Shetland Block. The development of the Bransfield Basin offers a good example of the tectonic processes involved in continental fragmentation associated with backarc basin development. CAPES-Brasil and Projects ANT99-0817 and REN2001-2143/ANT supported this contribution Peer reviewed |
format |
Article in Journal/Newspaper |
author |
Galindo Zaldívar, Jesús Gamboa, Luiz Maldonado, Andrés Nakao, Seizo Bochu, Yao |
author_facet |
Galindo Zaldívar, Jesús Gamboa, Luiz Maldonado, Andrés Nakao, Seizo Bochu, Yao |
author_sort |
Galindo Zaldívar, Jesús |
title |
Tectonic development of the Bransfield Basin and its prolongation to the South Scotia Ridge, northern Antarctic Peninsula |
title_short |
Tectonic development of the Bransfield Basin and its prolongation to the South Scotia Ridge, northern Antarctic Peninsula |
title_full |
Tectonic development of the Bransfield Basin and its prolongation to the South Scotia Ridge, northern Antarctic Peninsula |
title_fullStr |
Tectonic development of the Bransfield Basin and its prolongation to the South Scotia Ridge, northern Antarctic Peninsula |
title_full_unstemmed |
Tectonic development of the Bransfield Basin and its prolongation to the South Scotia Ridge, northern Antarctic Peninsula |
title_sort |
tectonic development of the bransfield basin and its prolongation to the south scotia ridge, northern antarctic peninsula |
publisher |
Elsevier |
publishDate |
2004 |
url |
http://hdl.handle.net/10261/19759 https://doi.org/10.1016/j.margeo.2004.02.007 |
long_lat |
ENVELOPE(-46.500,-46.500,-60.000,-60.000) ENVELOPE(-59.500,-59.500,-61.000,-61.000) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Scotia Sea South Shetland Islands South Scotia Ridge South Shetland Trench |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Scotia Sea South Shetland Islands South Scotia Ridge South Shetland Trench |
genre |
Antarc* Antarctic Antarctic Peninsula Scotia Sea South Shetland Islands |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Scotia Sea South Shetland Islands |
op_relation |
http://dx.doi.org/10.1016/j.margeo.2004.02.007 Marine Geology 206(1-4): 267-282 (2004) 0025-3227 http://hdl.handle.net/10261/19759 doi:10.1016/j.margeo.2004.02.007 |
op_rights |
none |
op_doi |
https://doi.org/10.1016/j.margeo.2004.02.007 |
container_title |
Marine Geology |
container_volume |
206 |
container_issue |
1-4 |
container_start_page |
267 |
op_container_end_page |
282 |
_version_ |
1790603734363930624 |