Geometry and structure of the pull-apart basins developed along the western South American-Scotia plate boundary (SW Atlantic Ocean)
The South American-Scotia plate boundary is a left-lateral fault system which runs roughly E-W for more than 3000 km across the SW Atlantic Ocean and the Tierra del Fuego Island, reaching to the west the southern Chile Trench. Analyses of a large dataset of single- and multi-channel seismic reflecti...
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2018
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v83_n_p96_Esteban http://hdl.handle.net/20.500.12110/paper_08959811_v83_n_p96_Esteban |
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paper:paper_08959811_v83_n_p96_Esteban2023-06-08T15:49:03Z Geometry and structure of the pull-apart basins developed along the western South American-Scotia plate boundary (SW Atlantic Ocean) Continental transform system Pull-apart basin Seismic data South American-Scotia plate boundary Southern Atlantic ocean Transtensional basin fault zone fold and thrust belt plate boundary pull apart basin seismic data seismic reflection transtension trench Atlantic Ocean Atlantic Ocean (Southwest) Tierra del Fuego [(ISG) South America] The South American-Scotia plate boundary is a left-lateral fault system which runs roughly E-W for more than 3000 km across the SW Atlantic Ocean and the Tierra del Fuego Island, reaching to the west the southern Chile Trench. Analyses of a large dataset of single- and multi-channel seismic reflection profiles acquired offshore has allowed to map the trace of the plate boundary from Tierra del Fuego to the Malvinas Trough, a tectonic depression located in the eastern part of the fault system, and to reconstruct the shape and geometry of the basins formed along the principal displacement zone of the fault system. Three main Neogene pull-apart basins that range from 70 to 100 km in length, and from 12 to 22 km in width, have been identified along this segment of the plate boundary. These basins have elongated shapes with their major axes parallel to the ENE-WSW direction of the fault zone. The sedimentary architecture and the infill geometry of the basins suggest that they represent mostly strike-slip dominated transtension basins which propagated from E to W. The basins imaged by seismic data show in some cases geometrical and structural features linked to the possible reactivation of previous wedge-top basins and inherited structures pertaining to the external front of the Magallanes fold-and-thrust compression belt, along which the South American-Scotia fault system has been superimposed. It is suggested that the sequence of the elongated basins occur symmetrically to a thorough going strike-slip fault, in a left-stepping geometrical arrangement, in a manner similar to those basins seen in other transcurrent environments. © 2018 Elsevier Ltd 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v83_n_p96_Esteban http://hdl.handle.net/20.500.12110/paper_08959811_v83_n_p96_Esteban |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Continental transform system Pull-apart basin Seismic data South American-Scotia plate boundary Southern Atlantic ocean Transtensional basin fault zone fold and thrust belt plate boundary pull apart basin seismic data seismic reflection transtension trench Atlantic Ocean Atlantic Ocean (Southwest) Tierra del Fuego [(ISG) South America] |
| spellingShingle |
Continental transform system Pull-apart basin Seismic data South American-Scotia plate boundary Southern Atlantic ocean Transtensional basin fault zone fold and thrust belt plate boundary pull apart basin seismic data seismic reflection transtension trench Atlantic Ocean Atlantic Ocean (Southwest) Tierra del Fuego [(ISG) South America] Geometry and structure of the pull-apart basins developed along the western South American-Scotia plate boundary (SW Atlantic Ocean) |
| topic_facet |
Continental transform system Pull-apart basin Seismic data South American-Scotia plate boundary Southern Atlantic ocean Transtensional basin fault zone fold and thrust belt plate boundary pull apart basin seismic data seismic reflection transtension trench Atlantic Ocean Atlantic Ocean (Southwest) Tierra del Fuego [(ISG) South America] |
| description |
The South American-Scotia plate boundary is a left-lateral fault system which runs roughly E-W for more than 3000 km across the SW Atlantic Ocean and the Tierra del Fuego Island, reaching to the west the southern Chile Trench. Analyses of a large dataset of single- and multi-channel seismic reflection profiles acquired offshore has allowed to map the trace of the plate boundary from Tierra del Fuego to the Malvinas Trough, a tectonic depression located in the eastern part of the fault system, and to reconstruct the shape and geometry of the basins formed along the principal displacement zone of the fault system. Three main Neogene pull-apart basins that range from 70 to 100 km in length, and from 12 to 22 km in width, have been identified along this segment of the plate boundary. These basins have elongated shapes with their major axes parallel to the ENE-WSW direction of the fault zone. The sedimentary architecture and the infill geometry of the basins suggest that they represent mostly strike-slip dominated transtension basins which propagated from E to W. The basins imaged by seismic data show in some cases geometrical and structural features linked to the possible reactivation of previous wedge-top basins and inherited structures pertaining to the external front of the Magallanes fold-and-thrust compression belt, along which the South American-Scotia fault system has been superimposed. It is suggested that the sequence of the elongated basins occur symmetrically to a thorough going strike-slip fault, in a left-stepping geometrical arrangement, in a manner similar to those basins seen in other transcurrent environments. © 2018 Elsevier Ltd |
| title |
Geometry and structure of the pull-apart basins developed along the western South American-Scotia plate boundary (SW Atlantic Ocean) |
| title_short |
Geometry and structure of the pull-apart basins developed along the western South American-Scotia plate boundary (SW Atlantic Ocean) |
| title_full |
Geometry and structure of the pull-apart basins developed along the western South American-Scotia plate boundary (SW Atlantic Ocean) |
| title_fullStr |
Geometry and structure of the pull-apart basins developed along the western South American-Scotia plate boundary (SW Atlantic Ocean) |
| title_full_unstemmed |
Geometry and structure of the pull-apart basins developed along the western South American-Scotia plate boundary (SW Atlantic Ocean) |
| title_sort |
geometry and structure of the pull-apart basins developed along the western south american-scotia plate boundary (sw atlantic ocean) |
| publishDate |
2018 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v83_n_p96_Esteban http://hdl.handle.net/20.500.12110/paper_08959811_v83_n_p96_Esteban |
| _version_ |
1768544325219647488 |