Mediterranean undercurrent sandy contourites, Gulf of Cadiz, Spain

Nelson, Claudia; Baraza, J.; Maldonado, Andrés

doi:10.1016/0037-0738(93)90116-m

Cited by 162 publications

(128 citation statements)

References 39 publications

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“…Kenyon and Belderson, 1973;García et al, 2009). The GDR forms a topographic high that constricts the MOW circulation pathways, dividing the current into minor branches (Nelson et al, 1993;Hernández-Molina et al, 2003). The lower core ofthe MOW has acted with different intensity in the CCC during the Late Quaternary.…”

Section: Oceanographic and Geological Settingmentioning

confidence: 99%

“…Large erosive incisions up to 200 m deep have been identified in the CCC (García et al, 2009). The channel floor shows a high backscatter, reflecting the presence of sandy-gravellags, outcropping diapirs and hard substrates (Nelson et al, 1993;Hernández-Molina et al, 2006). The morphology and near-surface deposits ofthe middle slope ofthe GulfofCadiz have been controlled by the MOW influence and its interaction with the tectonic features, promoting fluid escape collapses and the generation of specific structures such as blind valleys (León et al, 2010).…”

Section: Oceanographic and Geological Settingmentioning

confidence: 99%

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Ferromanganese nodules and micro-hardgrounds associated with the Cadiz Contourite Channel (NE Atlantic): Palaeoenvironmental records of fluid venting and bottom currents

et al. 2012

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Section: Oceanographic and Geological Settingmentioning

confidence: 99%

Section: Oceanographic and Geological Settingmentioning

confidence: 99%

Ferromanganese nodules and micro-hardgrounds associated with the Cadiz Contourite Channel (NE Atlantic): Palaeoenvironmental records of fluid venting and bottom currents

et al. 2012

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“…Studies from different geographical and stratigraphic settings (Mutti et al 1980;Barros et al 1982;Belonin et al 1983;Nelson et al 1993;Shanmugam et al 1993;Famakinwa et al 1997;Castro et al 1998;Parize et al 1998;Viana 1998;Viana & Faug~res 1998;Garcia-Moronero & Olmo 2001;Kenyon et al 2002;Cakebread-Brown et al 2003;Isem et al 2004;Rodriguez & Anderson 2004;Akhmetzhanov et al 2007), complemented by a large set of high-resolution 2D and 3D seismic, core, and well log data from the Equatorial and Southwestern Brazilian Atlantic margins, indicate that the occurrence of potentially economic sandy contourites is mostly dependent on the vicinity of a sand-rich area prone to be swept by contour currents.…”

Section: Petroleum Explorationmentioning

confidence: 99%

The economic importance of contourites

Viana

Almeida

Nunes

et al. 2007

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Abstract:The importance of contour currents in shaping and building continental margins has long been accepted. Their economic implications and the stratigraphic framework in which they are developed remain largely unknown. Data retrieved from sidescan sonar images, seismic profiles and their attribute maps, as well as sea-floor coring, boreholes and the few known outcrops around the world, suggest that bottom currents can locally develop large deposits of relatively coarse-grained sediments. Accumulation of coarse-grained deposits under the influence of bottom currents requires sediment availability, a geologically persistent strong circulation regime and a favourable physiographic setting both for enhancing the currents and for hosting the sediments. The hydrocarbon exploration of oceanic depositional systems demands a better understanding of the role of bottom currents and their implications for petroleum systems such as reservoir and sealing rocks. Such understanding implies additional alternatives for the definition of exploration targets and prospect risk reduction. Correlating seismic anomalies from 3D mapping with core and well logging data reveals the depositional geometry and sedimentological characteristics of coarse-grained contourites. Fine-grained drifts can locally and regionally develop large and thick accumulations, which have an important seal potential for trapping hydrocarbon.

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“…Este presenta un relieve accidentado, resultado de su evolución tectónica y la influencia de las diversas masas de agua de origen Atlántico y Mediterráneo que lo recorren Nelson et al, 1993;Instituto Tecnológico Geominero de España, 1995). La evolución geológica está dominada por la intersección con la terminación oriental de la línea de fractura Azores-Gibraltar y por el Arco de Gibraltar, que ocupa el sector oriental del área (Biju-Duval, 1978;Maldonado, 1985).…”

Section: Figura 20 Isopacas Del Sistema Deltaico Relicto (H2unclassified

“…El agua superficial Atlántica fluye en superficie hacia levante a lo largo de la plataforma continental del Golfo de Cádiz, mientras que el agua profunda Mediterránea se adapta al talud continental y fluye hacia el WNW a lo largo del margen continental (Nelson et al, 1993). Debido a la diferencia de densidades entre estas masas de agua, el agua Mediterránea se hunde progresivamente a medida que circula hacia poniente, entre los 200 m a la salida del Estrecho de Gibraltar y 1800 m en el sector occidental.…”

Section: Figura 20 Isopacas Del Sistema Deltaico Relicto (H2unclassified

La plataforma continental del Litoral Español

López

1995

ing.agua

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RESUMEN:Se realiza un ensayo de síntesis geológica sobre las plataforma españolas, en base a algunos ejemplos del mediterráneo y Golfo de Cádiz. La mayoría del margen continental español ha sido estructurado durante el Terciario, en gran parte como consecuencia de los movimientos relativos entre Europa/ África, existiendo otro hito importante en la evolución a partir del Mioceno, como consecuencia de la apertura del Estrecho de Gibraltar. La estratigrafía sísmica de estas plataformas, particularmente en las zonas de fuertes aportes terrígenos, está caracterizada por el desarrollo de cuerpos deposicionales condicionados por los índices relativos de cambios de nivel del mar. La presencia de estrechos y la existencia de una tectónica diferencial notable entre los varios sectores del margen ha condicionado unas características deposicionales particulares para los distintos sectores del litoral español. La evolución más reciente, caracterizada por la traslación hacia tierra del perfil litoral en numerosos sectores, está regulada por la influencia antropogénica.

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Mediterranean undercurrent sandy contourites, Gulf of Cadiz, Spain

Cited by 162 publications

References 39 publications

Ferromanganese nodules and micro-hardgrounds associated with the Cadiz Contourite Channel (NE Atlantic): Palaeoenvironmental records of fluid venting and bottom currents

Ferromanganese nodules and micro-hardgrounds associated with the Cadiz Contourite Channel (NE Atlantic): Palaeoenvironmental records of fluid venting and bottom currents

The economic importance of contourites

La plataforma continental del Litoral Español

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