Late Pleistocene-Holocene history of a tectonically active segment of the continental margin (Nekor basin, Western Mediterranean, Morocco)
20 pages, 14 figures, 1 table
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Elsevier
2018-11
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| Subjects: | Continental shelf, Swath bathymetry, Geomorphology, Pleistocene, Western Mediterranean, Seismic stratigraphy, Active tectonic, |
| Online Access: | http://hdl.handle.net/10261/172851 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100001665 http://dx.doi.org/10.13039/501100003329 |
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dig-icm-es-10261-1728512020-12-13T09:22:22Z Late Pleistocene-Holocene history of a tectonically active segment of the continental margin (Nekor basin, Western Mediterranean, Morocco) Lafosse, Manfred Gorini, Christian Leroy, Pascal Alonso, Belén D'Acremont, E. Ercilla, Gemma Rabineau, M. Vázquez, Juan Tomás Rabaute, Alain Ammar, Abdellah Agence Nationale de la Recherche (France) Ministerio de Economía y Competitividad (España) European Commission Continental shelf Swath bathymetry Geomorphology Pleistocene Western Mediterranean Seismic stratigraphy Active tectonic 20 pages, 14 figures, 1 table In active basins, tectonics can segment the continental shelf and control its stratigraphic architecture and physiography. Segmentation can explain the local evolution and morphology of the continental shelf because of sea-level variations, local tectonic segmentation and hydrodynamic processes. Here we investigate the tectonically active Morocco continental margin (southern Alboran Sea) using high-resolution seismic profiles and multibeam bathymetric data. The active faults bounding the transtensive Nekor basin triggered the segmentation of the shelf into three sectors showing different subsidence rates: a western sector corresponding to an extensive fault relay, a central sector corresponding to the subsiding Al-Hoceima Bay and an eastern sector corresponding to the footwall of the Trougout senestral normal fault. Results show that the staircase morphology of the shelf corresponds to successive submarine terraces at the shelf edge (ST1), mid-shelf (ST2) and inner-shelf (ST3) around −110 m,-80 m, and −40 to −20 m deep, respectively. The terraces correspond to the top of prograding wedges seaward and are erosive landward. They are correlated with stillstand from the Last Glacial Maximum to the Holocene highstand. Above the terraces, sub-aqueous dune fields are interpreted as degraded and deposited during the post-glacial transgression. In the central sector, typical delta front seafloor undulations on the shelf and crescent shaped bedforms at the head of marine incisions on the upper slope denote a fluvial influence during the Holocene. Seismic stratigraphy analysis revealed the preservation of six seismic units bounded by polygenic regional unconformities (S1, S2, S3, S4 and S5). Based on comparison with other Mediterranean margins, S1 to S5 are attributed to 4th order maximum regressive surface. We discuss the local preservation of the system tracts as a function of the vertical motion and the physiography of this tectonically active domain. This study provides useful clues for future local paleo-seismic analysis and to advance our understanding of sedimentary processes in active areas This work was funded by the French program Actions Marges, the EUROFLEETS program (FP7/2007-2013; n°228344), project FICTS-2011-03-01. Seismic reflection data were processed using the Seismic UNIX SU and Geovecteur software. [...]. This work also benefited from a State Grant from the French Agence Nationale de la Recherche (ANR) in the Program « Investissements d'avenir » reference ANR-10-LABX-19-01, Labex Mer and from the Fauces Project (Ref CTM2015-65461-C2-R; MINCIU/FEDER) financed by "Ministerio de Economía y Competitividad y al Fondo Europeo de Desarrollo Regional" (FEDER) Peer Reviewed 2018-11-30T11:55:04Z 2018-11-30T11:55:04Z 2018-11 2018-11-30T11:55:04Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1016/j.marpetgeo.2018.07.022 issn: 0264-8172 1873-4073 Marine and Petroleum Geology 97: 370-389 (2018) http://hdl.handle.net/10261/172851 10.1016/j.marpetgeo.2018.07.022 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100001665 http://dx.doi.org/10.13039/501100003329 #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2015-65461-C2-R https://dx.doi.org/10.1016/j.marpetgeo.2018.07.022 Sí open Elsevier |
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Continental shelf Swath bathymetry Geomorphology Pleistocene Western Mediterranean Seismic stratigraphy Active tectonic Continental shelf Swath bathymetry Geomorphology Pleistocene Western Mediterranean Seismic stratigraphy Active tectonic |
| spellingShingle |
Continental shelf Swath bathymetry Geomorphology Pleistocene Western Mediterranean Seismic stratigraphy Active tectonic Continental shelf Swath bathymetry Geomorphology Pleistocene Western Mediterranean Seismic stratigraphy Active tectonic Lafosse, Manfred Gorini, Christian Leroy, Pascal Alonso, Belén D'Acremont, E. Ercilla, Gemma Rabineau, M. Vázquez, Juan Tomás Rabaute, Alain Ammar, Abdellah Late Pleistocene-Holocene history of a tectonically active segment of the continental margin (Nekor basin, Western Mediterranean, Morocco) |
| description |
20 pages, 14 figures, 1 table |
| author2 |
Agence Nationale de la Recherche (France) |
| author_facet |
Agence Nationale de la Recherche (France) Lafosse, Manfred Gorini, Christian Leroy, Pascal Alonso, Belén D'Acremont, E. Ercilla, Gemma Rabineau, M. Vázquez, Juan Tomás Rabaute, Alain Ammar, Abdellah |
| format |
artículo |
| topic_facet |
Continental shelf Swath bathymetry Geomorphology Pleistocene Western Mediterranean Seismic stratigraphy Active tectonic |
| author |
Lafosse, Manfred Gorini, Christian Leroy, Pascal Alonso, Belén D'Acremont, E. Ercilla, Gemma Rabineau, M. Vázquez, Juan Tomás Rabaute, Alain Ammar, Abdellah |
| author_sort |
Lafosse, Manfred |
| title |
Late Pleistocene-Holocene history of a tectonically active segment of the continental margin (Nekor basin, Western Mediterranean, Morocco) |
| title_short |
Late Pleistocene-Holocene history of a tectonically active segment of the continental margin (Nekor basin, Western Mediterranean, Morocco) |
| title_full |
Late Pleistocene-Holocene history of a tectonically active segment of the continental margin (Nekor basin, Western Mediterranean, Morocco) |
| title_fullStr |
Late Pleistocene-Holocene history of a tectonically active segment of the continental margin (Nekor basin, Western Mediterranean, Morocco) |
| title_full_unstemmed |
Late Pleistocene-Holocene history of a tectonically active segment of the continental margin (Nekor basin, Western Mediterranean, Morocco) |
| title_sort |
late pleistocene-holocene history of a tectonically active segment of the continental margin (nekor basin, western mediterranean, morocco) |
| publisher |
Elsevier |
| publishDate |
2018-11 |
| url |
http://hdl.handle.net/10261/172851 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100001665 http://dx.doi.org/10.13039/501100003329 |
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1777666831186657280 |