Erosive sub-circular depressions on the Guadalquivir Bank (Gulf of Cadiz): Interaction between bottom current, mass-wasting and tectonic processes
Special issue The contourite log-book: significance for palaeoceanography, ecosystems and slope instability.-- 15 pages, 9 figures
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| Format: | artículo biblioteca |
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Elsevier
2016-08
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| Subjects: | Gulf of Cadiz, Contourite depositional systems, Erosional features, Morphology, Seismic stratigraphy, Mediterranean Outflow Water, |
| Online Access: | http://hdl.handle.net/10261/135510 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100011011 |
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dig-icm-es-10261-1355102019-10-03T07:35:01Z Erosive sub-circular depressions on the Guadalquivir Bank (Gulf of Cadiz): Interaction between bottom current, mass-wasting and tectonic processes García, Marga Hernández-Molina, Francisco J. Alonso, Belén Vázquez, Juan Tomás Ercilla, Gemma Llave, Estefanía Casas, David Ministerio de Economía y Competitividad (España) Junta de Andalucía Gulf of Cadiz Contourite depositional systems Erosional features Morphology Seismic stratigraphy Mediterranean Outflow Water Special issue The contourite log-book: significance for palaeoceanography, ecosystems and slope instability.-- 15 pages, 9 figures Morphological features (escarpments, depressions and valleys) identified on the Guadalquivir Bank, within the middle slope of the Gulf of Cadiz, have been investigated based on high- and mid-resolution geophysical datasets. The morphological and seismic stratigraphic analyses allowed their interpretation as the result of the interaction between oceanographic, mass-wasting and tectonic processes. A phase of enhanced tectonic activity occurred during the Mid-Pleistocene related to the activity of diapiric structures, the front of the allochthonous units, and/or basement uplift or adjustments. This event seems crucial for the origin of widespread mass-wasting events along middle slope sheeted drift plateaus that have been further reworked by the Mediterranean Outflow Water. This resulted in the erosion of a marginal valley to the north of the Guadalquivir Bank, while fluid escape processes also have a minor role in the creation of crescent-shaped depressions. The Diego Cao channel is the result of a complex evolution, from a contourite moat associated to a separated drift to a multi-crested drift and moat system during the Pliocene and Early Quaternary. During the Mid-Pleistocene, the mass-wasting phase produced a prominent erosive surface that opened a deep gateway into the Guadalquivir Bank uplifted basement, allowing the onset of the Mediterranean Intermediate Branch to flow towards the N-NW. The system evolved into a contourite system composed of the present-day channel and an associated deposit on its western side (Bartolomeu Dias sheeted drift plateau) that forms a particularly complex separated drift. This drift displays a series of circular depressions that are similar in morphology to collapse features or pockmarks, but are in contrast, the result of the interaction between the bottom current and the irregular mass-wasting-related scars This research is part of the projects MONTERA (CTM-14157-C02-02) and MOWER (CTM-2012-395599-C03) funded by the Spanish Ministry of Economy and Competitiveness. The research of Marga Garcia has been funded by a Juan de la Cierva Grant (Spanish Ministry of Economy and Competitiveness) and a Talentia Grant (Junta de Andalucia and European Union, grant reference 267226) Peer Reviewed 2016-08-12T06:31:15Z 2016-08-12T06:31:15Z 2016-08 2016-08-12T06:31:16Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1016/j.margeo.2015.10.004 issn: 0025-3227 Marine Geology 378: 5-19 (2016) http://hdl.handle.net/10261/135510 10.1016/j.margeo.2015.10.004 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100011011 https://dx.doi.org/10.1016/j.margeo.2015.10.004 Sí none Elsevier |
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Gulf of Cadiz Contourite depositional systems Erosional features Morphology Seismic stratigraphy Mediterranean Outflow Water Gulf of Cadiz Contourite depositional systems Erosional features Morphology Seismic stratigraphy Mediterranean Outflow Water |
| spellingShingle |
Gulf of Cadiz Contourite depositional systems Erosional features Morphology Seismic stratigraphy Mediterranean Outflow Water Gulf of Cadiz Contourite depositional systems Erosional features Morphology Seismic stratigraphy Mediterranean Outflow Water García, Marga Hernández-Molina, Francisco J. Alonso, Belén Vázquez, Juan Tomás Ercilla, Gemma Llave, Estefanía Casas, David Erosive sub-circular depressions on the Guadalquivir Bank (Gulf of Cadiz): Interaction between bottom current, mass-wasting and tectonic processes |
| description |
Special issue The contourite log-book: significance for palaeoceanography, ecosystems and slope instability.-- 15 pages, 9 figures |
| author2 |
Ministerio de Economía y Competitividad (España) |
| author_facet |
Ministerio de Economía y Competitividad (España) García, Marga Hernández-Molina, Francisco J. Alonso, Belén Vázquez, Juan Tomás Ercilla, Gemma Llave, Estefanía Casas, David |
| format |
artículo |
| topic_facet |
Gulf of Cadiz Contourite depositional systems Erosional features Morphology Seismic stratigraphy Mediterranean Outflow Water |
| author |
García, Marga Hernández-Molina, Francisco J. Alonso, Belén Vázquez, Juan Tomás Ercilla, Gemma Llave, Estefanía Casas, David |
| author_sort |
García, Marga |
| title |
Erosive sub-circular depressions on the Guadalquivir Bank (Gulf of Cadiz): Interaction between bottom current, mass-wasting and tectonic processes |
| title_short |
Erosive sub-circular depressions on the Guadalquivir Bank (Gulf of Cadiz): Interaction between bottom current, mass-wasting and tectonic processes |
| title_full |
Erosive sub-circular depressions on the Guadalquivir Bank (Gulf of Cadiz): Interaction between bottom current, mass-wasting and tectonic processes |
| title_fullStr |
Erosive sub-circular depressions on the Guadalquivir Bank (Gulf of Cadiz): Interaction between bottom current, mass-wasting and tectonic processes |
| title_full_unstemmed |
Erosive sub-circular depressions on the Guadalquivir Bank (Gulf of Cadiz): Interaction between bottom current, mass-wasting and tectonic processes |
| title_sort |
erosive sub-circular depressions on the guadalquivir bank (gulf of cadiz): interaction between bottom current, mass-wasting and tectonic processes |
| publisher |
Elsevier |
| publishDate |
2016-08 |
| url |
http://hdl.handle.net/10261/135510 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/501100011011 |
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