The role of late Quaternary tectonic activity and sea-level changes on sedimentary processes interaction in the Gulf of Cadiz upper and middle continental slope (SW Iberia)
A morphological and seismic-stratigraphic analysis of the Gulf of Cadiz area near the Strait of Gibraltar is presented in this work, focused on the sedimentary evolution of the upper and proximal middle-continental slope since the Mid-Pleistocene. Based on the analysis of seismic reflection profiles...
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Centro Oceanográfico de Cádiz
2020
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Online Access: | http://hdl.handle.net/10508/11966 https://doi.org/10.1016/j.marpetgeo.2020.104595 |
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ftieo:oai:repositorio.ieo.es:10508/11966 2023-05-15T17:36:54+02:00 The role of late Quaternary tectonic activity and sea-level changes on sedimentary processes interaction in the Gulf of Cadiz upper and middle continental slope (SW Iberia) García-García, M. (Margarita) Llave, E. (Estefanía) Hernández-Molina, F.J. (Francisco Javier) Lobo, F.J. (Francisco J.) Ercilla, G. (Gemma) Alonso, B. (Belén) Casas, D. (David) Mena, A. Fernández-Salas, L.M. (Luis Miguel) 2020-07-17 http://hdl.handle.net/10508/11966 https://doi.org/10.1016/j.marpetgeo.2020.104595 eng eng Centro Oceanográfico de Cádiz 0264-8172 http://hdl.handle.net/10508/11966 Marine and Petroleum Geology, 121. 2020: 104595-104616 doi:10.1016/j.marpetgeo.2020.104595 openAccess Tectónica Golfo de Cádiz Contornitas gullies sea level changes petroleum geology continental slope petroleum sea level article 2020 ftieo https://doi.org/10.1016/j.marpetgeo.2020.104595 2022-08-30T23:47:27Z A morphological and seismic-stratigraphic analysis of the Gulf of Cadiz area near the Strait of Gibraltar is presented in this work, focused on the sedimentary evolution of the upper and proximal middle-continental slope since the Mid-Pleistocene. Based on the analysis of seismic reflection profiles and swath bathymetry data, this work analyses the close influence of the activity of buried and outcropping diapiric ridges and late Quaternary sea-level changes on the evolution of contouritic features related to the Mediterranean Outflow Water (MOW) and Eastern North Atlantic Central Water (ENACW), gravitational features and fluid-escape structures. The stratigraphic architecture reveals that, under active diapiric deformation, the upper slope plastered drift grew during low sea-level stages, when sediment supply was high and the ENACW swept the upper slope, contrasting with the present-day highstand situation dominated by northwest-trending MOW flow. The south-estward ENACW flow forced asymmetry and lateral migration of gullies incised in the plastered drift. Two evolutionary stages have been established: 1) After the Mid Pleistocene, activity of diapirs with a NE trend determined the location of the deepest depressions which were infilled by plastered contouritic drifts; 2) Between Late Quaternary and present, a drastic change of buried diapirs growth pattern and orientation to a NW trend enhanced slope-derived gravitational processes affecting the bottom current dynamics. Adjustments to tectonic changes led to a phase of plastered drift growth on the upper slope during which depocenters varied their distribution and orientation. In a long-term the structural control on sedimentation shows a northwestward displacement of deformation, resulting in an overall extension of the contourite depositional system to the NW. In a short-term, sea-level changes favored drift deposition, gullies incision and the strengthening of water masses. This work evidences the importance of tectonic deformation in sedimentation at ... Article in Journal/Newspaper North Atlantic Instituto Español de Oceanografía: e-IEO Marine and Petroleum Geology 121 104595 |
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Open Polar |
collection |
Instituto Español de Oceanografía: e-IEO |
op_collection_id |
ftieo |
language |
English |
topic |
Tectónica Golfo de Cádiz Contornitas gullies sea level changes petroleum geology continental slope petroleum sea level |
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Tectónica Golfo de Cádiz Contornitas gullies sea level changes petroleum geology continental slope petroleum sea level García-García, M. (Margarita) Llave, E. (Estefanía) Hernández-Molina, F.J. (Francisco Javier) Lobo, F.J. (Francisco J.) Ercilla, G. (Gemma) Alonso, B. (Belén) Casas, D. (David) Mena, A. Fernández-Salas, L.M. (Luis Miguel) The role of late Quaternary tectonic activity and sea-level changes on sedimentary processes interaction in the Gulf of Cadiz upper and middle continental slope (SW Iberia) |
topic_facet |
Tectónica Golfo de Cádiz Contornitas gullies sea level changes petroleum geology continental slope petroleum sea level |
description |
A morphological and seismic-stratigraphic analysis of the Gulf of Cadiz area near the Strait of Gibraltar is presented in this work, focused on the sedimentary evolution of the upper and proximal middle-continental slope since the Mid-Pleistocene. Based on the analysis of seismic reflection profiles and swath bathymetry data, this work analyses the close influence of the activity of buried and outcropping diapiric ridges and late Quaternary sea-level changes on the evolution of contouritic features related to the Mediterranean Outflow Water (MOW) and Eastern North Atlantic Central Water (ENACW), gravitational features and fluid-escape structures. The stratigraphic architecture reveals that, under active diapiric deformation, the upper slope plastered drift grew during low sea-level stages, when sediment supply was high and the ENACW swept the upper slope, contrasting with the present-day highstand situation dominated by northwest-trending MOW flow. The south-estward ENACW flow forced asymmetry and lateral migration of gullies incised in the plastered drift. Two evolutionary stages have been established: 1) After the Mid Pleistocene, activity of diapirs with a NE trend determined the location of the deepest depressions which were infilled by plastered contouritic drifts; 2) Between Late Quaternary and present, a drastic change of buried diapirs growth pattern and orientation to a NW trend enhanced slope-derived gravitational processes affecting the bottom current dynamics. Adjustments to tectonic changes led to a phase of plastered drift growth on the upper slope during which depocenters varied their distribution and orientation. In a long-term the structural control on sedimentation shows a northwestward displacement of deformation, resulting in an overall extension of the contourite depositional system to the NW. In a short-term, sea-level changes favored drift deposition, gullies incision and the strengthening of water masses. This work evidences the importance of tectonic deformation in sedimentation at ... |
format |
Article in Journal/Newspaper |
author |
García-García, M. (Margarita) Llave, E. (Estefanía) Hernández-Molina, F.J. (Francisco Javier) Lobo, F.J. (Francisco J.) Ercilla, G. (Gemma) Alonso, B. (Belén) Casas, D. (David) Mena, A. Fernández-Salas, L.M. (Luis Miguel) |
author_facet |
García-García, M. (Margarita) Llave, E. (Estefanía) Hernández-Molina, F.J. (Francisco Javier) Lobo, F.J. (Francisco J.) Ercilla, G. (Gemma) Alonso, B. (Belén) Casas, D. (David) Mena, A. Fernández-Salas, L.M. (Luis Miguel) |
author_sort |
García-García, M. (Margarita) |
title |
The role of late Quaternary tectonic activity and sea-level changes on sedimentary processes interaction in the Gulf of Cadiz upper and middle continental slope (SW Iberia) |
title_short |
The role of late Quaternary tectonic activity and sea-level changes on sedimentary processes interaction in the Gulf of Cadiz upper and middle continental slope (SW Iberia) |
title_full |
The role of late Quaternary tectonic activity and sea-level changes on sedimentary processes interaction in the Gulf of Cadiz upper and middle continental slope (SW Iberia) |
title_fullStr |
The role of late Quaternary tectonic activity and sea-level changes on sedimentary processes interaction in the Gulf of Cadiz upper and middle continental slope (SW Iberia) |
title_full_unstemmed |
The role of late Quaternary tectonic activity and sea-level changes on sedimentary processes interaction in the Gulf of Cadiz upper and middle continental slope (SW Iberia) |
title_sort |
role of late quaternary tectonic activity and sea-level changes on sedimentary processes interaction in the gulf of cadiz upper and middle continental slope (sw iberia) |
publisher |
Centro Oceanográfico de Cádiz |
publishDate |
2020 |
url |
http://hdl.handle.net/10508/11966 https://doi.org/10.1016/j.marpetgeo.2020.104595 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
0264-8172 http://hdl.handle.net/10508/11966 Marine and Petroleum Geology, 121. 2020: 104595-104616 doi:10.1016/j.marpetgeo.2020.104595 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1016/j.marpetgeo.2020.104595 |
container_title |
Marine and Petroleum Geology |
container_volume |
121 |
container_start_page |
104595 |
_version_ |
1766136534084354048 |