Propagating rift during the opening of a small oceanic basin: the Protector Basin (Scotia Arc, Antactica).
15 pages, 8 figures. The opening of oceanic basins constitutes one of the key features of Plate Tectonics because it determines the rifting and displacement of the continental crustal blocks. Although the mechanisms of development of large oceans are well known, the opening and evolution of small an...
Published in: | Earth and Planetary Science Letters |
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Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2006
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Online Access: | http://hdl.handle.net/10261/18856 https://doi.org/10.1016/j.epsl.2005.11.056 |
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ftcsic:oai:digital.csic.es:10261/18856 2024-02-11T10:08:28+01:00 Propagating rift during the opening of a small oceanic basin: the Protector Basin (Scotia Arc, Antactica). Galindo Zaldívar, Jesús Bohoyo, Fernando Maldonado, Andrés Schreider, Anatoly Suriñach, Emma Vázquez, Juan Tomás 2006-01-31 application/octet-stream http://hdl.handle.net/10261/18856 https://doi.org/10.1016/j.epsl.2005.11.056 en eng Elsevier http://dx.doi.org/10.1016/j.epsl.2005.11.056 Earth and Planetary Science Letters 241(3-4): 398-412 (2006) http://hdl.handle.net/10261/18856 doi:10.1016/j.epsl.2005.11.056 none Oceanic spreading Seafloor magnetic anomalies Propagating rift Middle Miocene Scotia Arc artículo http://purl.org/coar/resource_type/c_6501 2006 ftcsic https://doi.org/10.1016/j.epsl.2005.11.056 2024-01-16T09:24:31Z 15 pages, 8 figures. The opening of oceanic basins constitutes one of the key features of Plate Tectonics because it determines the rifting and displacement of the continental crustal blocks. Although the mechanisms of development of large oceans are well known, the opening and evolution of small and middle size oceanic basins have not been studied in detail. The Protector Basin, located in the southern Scotia Sea, is a good example of a small oceanic basin developed between two thinned continental blocks, the Pirie Bank and the Terror Rise, poorly studied up to now. A new set of multibeam bathymetry, multichannel seismic reflection, and gravity and magnetic anomaly profiles obtained on the SCAN 2001 cruise led us to determine that the Protector Basin probably opened during the period comprised between C5Dn (17.4 Ma) and C5ACn–C5ABr chrons (13.8 Ma), forming a N–S oriented spreading axis. The end of spreading is slightly younger to the north. The start of spreading is clearly diachronous, with the most complete set of chrons up to C5Dn in the southern profile, C5Cn in the middle section and only up to C5ADn in the northern part of the basin. The spreading axis propagated northwards during the basin development, producing the wedge shape of the basin. In addition, at the NE part of the basin, a reverse fault developed in the border of the Pirie Bank after basin opening accentuates the sharp northern end. Moreover, the northwestern part of the Pirie Bank margin is an extremely stretched continental crust with N–S elongated magnetic anomalies related to incipient oceanic southward propagating spreading axes. The Protector Basin shows the oldest evidence of E–W continental stretching and subsequent oceanic spreading during Middle Miocene, related with the eastward development of the Scotia Arc that continues up to Present. The relative rotation of continental blocks during the development of small sized oceanic basins by continental block drifting favoured the opening of wedge shape basins like the Protector Basin ... Article in Journal/Newspaper Scotia Sea Digital.CSIC (Spanish National Research Council) Pirie ENVELOPE(-44.633,-44.633,-60.700,-60.700) Protector ENVELOPE(-66.217,-66.217,-66.717,-66.717) Protector Basin ENVELOPE(-49.000,-49.000,-59.000,-59.000) Scotia Sea Earth and Planetary Science Letters 241 3-4 398 412 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Oceanic spreading Seafloor magnetic anomalies Propagating rift Middle Miocene Scotia Arc |
spellingShingle |
Oceanic spreading Seafloor magnetic anomalies Propagating rift Middle Miocene Scotia Arc Galindo Zaldívar, Jesús Bohoyo, Fernando Maldonado, Andrés Schreider, Anatoly Suriñach, Emma Vázquez, Juan Tomás Propagating rift during the opening of a small oceanic basin: the Protector Basin (Scotia Arc, Antactica). |
topic_facet |
Oceanic spreading Seafloor magnetic anomalies Propagating rift Middle Miocene Scotia Arc |
description |
15 pages, 8 figures. The opening of oceanic basins constitutes one of the key features of Plate Tectonics because it determines the rifting and displacement of the continental crustal blocks. Although the mechanisms of development of large oceans are well known, the opening and evolution of small and middle size oceanic basins have not been studied in detail. The Protector Basin, located in the southern Scotia Sea, is a good example of a small oceanic basin developed between two thinned continental blocks, the Pirie Bank and the Terror Rise, poorly studied up to now. A new set of multibeam bathymetry, multichannel seismic reflection, and gravity and magnetic anomaly profiles obtained on the SCAN 2001 cruise led us to determine that the Protector Basin probably opened during the period comprised between C5Dn (17.4 Ma) and C5ACn–C5ABr chrons (13.8 Ma), forming a N–S oriented spreading axis. The end of spreading is slightly younger to the north. The start of spreading is clearly diachronous, with the most complete set of chrons up to C5Dn in the southern profile, C5Cn in the middle section and only up to C5ADn in the northern part of the basin. The spreading axis propagated northwards during the basin development, producing the wedge shape of the basin. In addition, at the NE part of the basin, a reverse fault developed in the border of the Pirie Bank after basin opening accentuates the sharp northern end. Moreover, the northwestern part of the Pirie Bank margin is an extremely stretched continental crust with N–S elongated magnetic anomalies related to incipient oceanic southward propagating spreading axes. The Protector Basin shows the oldest evidence of E–W continental stretching and subsequent oceanic spreading during Middle Miocene, related with the eastward development of the Scotia Arc that continues up to Present. The relative rotation of continental blocks during the development of small sized oceanic basins by continental block drifting favoured the opening of wedge shape basins like the Protector Basin ... |
format |
Article in Journal/Newspaper |
author |
Galindo Zaldívar, Jesús Bohoyo, Fernando Maldonado, Andrés Schreider, Anatoly Suriñach, Emma Vázquez, Juan Tomás |
author_facet |
Galindo Zaldívar, Jesús Bohoyo, Fernando Maldonado, Andrés Schreider, Anatoly Suriñach, Emma Vázquez, Juan Tomás |
author_sort |
Galindo Zaldívar, Jesús |
title |
Propagating rift during the opening of a small oceanic basin: the Protector Basin (Scotia Arc, Antactica). |
title_short |
Propagating rift during the opening of a small oceanic basin: the Protector Basin (Scotia Arc, Antactica). |
title_full |
Propagating rift during the opening of a small oceanic basin: the Protector Basin (Scotia Arc, Antactica). |
title_fullStr |
Propagating rift during the opening of a small oceanic basin: the Protector Basin (Scotia Arc, Antactica). |
title_full_unstemmed |
Propagating rift during the opening of a small oceanic basin: the Protector Basin (Scotia Arc, Antactica). |
title_sort |
propagating rift during the opening of a small oceanic basin: the protector basin (scotia arc, antactica). |
publisher |
Elsevier |
publishDate |
2006 |
url |
http://hdl.handle.net/10261/18856 https://doi.org/10.1016/j.epsl.2005.11.056 |
long_lat |
ENVELOPE(-44.633,-44.633,-60.700,-60.700) ENVELOPE(-66.217,-66.217,-66.717,-66.717) ENVELOPE(-49.000,-49.000,-59.000,-59.000) |
geographic |
Pirie Protector Protector Basin Scotia Sea |
geographic_facet |
Pirie Protector Protector Basin Scotia Sea |
genre |
Scotia Sea |
genre_facet |
Scotia Sea |
op_relation |
http://dx.doi.org/10.1016/j.epsl.2005.11.056 Earth and Planetary Science Letters 241(3-4): 398-412 (2006) http://hdl.handle.net/10261/18856 doi:10.1016/j.epsl.2005.11.056 |
op_rights |
none |
op_doi |
https://doi.org/10.1016/j.epsl.2005.11.056 |
container_title |
Earth and Planetary Science Letters |
container_volume |
241 |
container_issue |
3-4 |
container_start_page |
398 |
op_container_end_page |
412 |
_version_ |
1790607817980248064 |