The contourite depositional system of the Gulf of Cádiz: A sedimentary model related to the bottom current activity of the Mediterranean outflow water and its interaction with the continental margin

Hernández-Molina, F. Javier; Llave, Estefanía; Stow, Dorrik; García, Marga; Somoza, Luı́s; Vázquez, Juan Tomás; Lobo, F. J.; Maestro, Adolfo; Río, Víctor Díaz del; León, Ricardo; Medialdea, Teresa; Gardner, J. M.

doi:10.1016/j.dsr2.2006.04.016

Cited by 205 publications

(154 citation statements)

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“…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%

“…These COS are often coincident with areas affected by deep-seated fluid venting (mud volcanism and mud diapirism), as occurs in the Gulf of Cadiz, the Alboran Sea, the Gulf of Mexico, the Argentina Atlantic margin, the Brazil Basin, the South China Sea and others (e.g. Ercilla et al, 2002;Somoza et al, 2003;Chen et al, 2005;Chen et al, 2006;Hernández-Molina et al, 2006;. In addition, on these margins the low sea-Ievel stages should promote the washing of Fe from the continental shelves towards the deeper areas with Fe-oxyhydroxide-enriched sediments from highly weathered continental and shelf regions.…”

Section: Analogous Ferromanganiferous Deposits On Continental Marginsmentioning

confidence: 99%

“…The MOW divides into two main cores: Mediterranean upper and lower waters, moving across the upper slope (500-800 m) and the middle slope (800-1200 m), respectively (e.g. Howe, 1979a, 1979b;Gardner and Kidd, 1987;Hernández-Molina et al, 2006;Llave et al, 2006;. The North Atlantic Deep Water (NADW) is situated below the MOW (Ochoa and Bray, 1991).…”

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: Analogous Ferromanganiferous Deposits On Continental Marginsmentioning

confidence: 99%

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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“…The northern Alboran Sea is affected by upwelling along the Spanish coast providing nutrients and enhanced primary productivity (Minas et al, 1991;Peeters et al, 2002;Sarhan et al, 2000). The bottom layer is represented by the Western Mediterranean Deep Water (WMDW; water temperature ∼ 13 • C, salinity ∼ 38.5) below 1000 m, formed due to overturning in the Gulf of Lions (Bryden et al, 1994;Hernández-Molina et al, 2006;Millot, 1999;Rhein, 1995). The intermediate layer found between ∼ 200 and 1000 m is composed of the salty (up to 39.1) and warm (14.7 to 17 • C) Levantine Intermediate Water (LIW) which originates from overturning in the Eastern Mediterranean ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Variations in Mediterranean–Atlantic exchange across the late Pliocene climate transition

2018

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Abstract. Mediterranean-Atlantic exchange through the Strait of Gibraltar plays a significant role in the global oceanclimate dynamics in two ways. On one side, the injection of the saline and warm Mediterranean Outflow Water (MOW) contributes to North Atlantic deep-water formation. In return, the Atlantic inflow is considered a sink of less saline water for the North Atlantic Ocean. However, while the history of MOW is the focus of numerous studies, the Pliocene Atlantic inflow has received little attention so far. The present study provides an assessment of the Mediterranean-Atlantic exchange with a focus on the Atlantic inflow strength and its response to regional and global climate from 3.33 to 2.60 Ma. This time interval comprises the mid-Pliocene warm period (MPWP; 3.29-2.97 Ma) and the onset of the Northern Hemisphere glaciation (NHG). For this purpose, gradients in surface δ 18 O records of the planktonic foraminifer Globigerinoides ruber between the Integrated Ocean Drilling Program (IODP) Hole U1389E (Gulf of Cádiz) and Ocean Drilling Program (ODP) Hole 978A (Alboran Sea) have been evaluated. Interglacial stages and warm glacials of the MPWP revealed steep and reversed (relative to the present) W-E δ 18 O gradients suggesting a weakening of MediterraneanAtlantic exchange likely caused by high levels of relative humidity in the Mediterranean region. In contrast, periods of stronger inflow are indicated by flat δ 18 O gradients due to more intense arid conditions during the severe glacial Marine Isotope Stage (MIS) M2 and the initiation of NHG (MIS G22, G14, G6-104). Intensified Mediterranean-Atlantic exchange in cold periods is linked to the occurrence of icerafted debris (IRD) at low latitudes and a weakening of the Atlantic Meridional Overturning Circulation (AMOC). Our results thus suggest the development of a negative feedback between AMOC and exchange rates at the Strait of Gibraltar in the latest Pliocene as it has been proposed for the late Quaternary.

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“…The northern Alboran Sea is affected by upwelling along the Spanish coast providing nutrients and enhanced 80 primary productivity (Minas et al, 1991;Peeters et al, 2002;Sarhan et al, 2000). The bottom layer is represented by the Western Mediterranean Deep water (WMDW; water temperature ~ 13 °C, salinity ~ 38.5) below 1000 m, formed due to overturning in the Gulf of Lions (Bryden et al, 1994;Hernández-Molina et al, 2006;Millot, 1999;Rhein, 1995). The intermediate layer found between ~ 200 and 1000 m is composed of the salty (up to 39.1) and warm (14.7 to 17 °C) Levantine Intermediate water (LIW) which 85 originates from overturning in the Eastern Mediterranean (Millot, 2013;Wüst, 1961).…”

Section: Introductionmentioning

confidence: 99%

Variations of Mediterranean–Atlantic exchange across the late Pliocene climate transition

García-Gallardo¹,

Grunert²,

Piller³

2017

Preprint

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Abstract. Mediterranean-Atlantic exchange through the Strait of Gibraltar plays a significant role in the global ocean-climate dynamics in two ways. On one side, the injection of the saline and warm 10 Mediterranean Outflow Water (MOW) contributes to North Atlantic deep-water formation. In return, the Atlantic inflow is considered a sink of less saline water for the North Atlantic Ocean. However, while the history of MOW is the focus of numerous studies, the latter has received little attention so far. The present study provides an assessment of the Mediterranean-Atlantic exchange with focus on the

show abstract

The contourite depositional system of the Gulf of Cádiz: A sedimentary model related to the bottom current activity of the Mediterranean outflow water and its interaction with the continental margin

Cited by 205 publications

References 136 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

Variations in Mediterranean–Atlantic exchange across the late Pliocene climate transition

Variations of Mediterranean–Atlantic exchange across the late Pliocene climate transition

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