scholarly journals Lithospheric structure under the western African-European plate boundary: A transect across the Atlas Mountains and the Gulf of Cadiz

Tectonics ◽  
2005 ◽  
Vol 24 (2) ◽  
pp. n/a-n/a ◽  
Author(s):  
Hermann Zeyen ◽  
Puy Ayarza ◽  
Manel Fernàndez ◽  
Abdelkrim Rimi
Keyword(s):  
Plate Boundary ◽  
Lithospheric Structure ◽  
Gulf Of Cadiz ◽  
Atlas Mountains ◽  
Gulf Of Cádiz ◽  
European Plate

scholarly journals Thrust–wrench interference tectonics in the Gulf of Cadiz (Africa–Iberia plate boundary in the North-East Atlantic): Insights from analog models

2011 ◽  
Vol 289 (1-4) ◽  
pp. 135-149 ◽  
Author(s):  
João C. Duarte ◽  
Filipe M. Rosas ◽  
Pedro Terrinha ◽  
Marc-André Gutscher ◽  
Jacques Malavieille ◽  
...  
Keyword(s):  
Plate Boundary ◽  
Gulf Of Cadiz ◽  
East Atlantic ◽  
North East ◽  
The North ◽  
Gulf Of Cádiz ◽  
Analog Models

scholarly journals Tsunamigenic earthquakes in the Gulf of Cadiz: fault model and recurrence

2013 ◽  
Vol 13 (1) ◽  
pp. 1-13 ◽  
Author(s):  
L. M. Matias ◽  
T. Cunha ◽  
A. Annunziato ◽  
M. A. Baptista ◽  
F. Carrilho
Keyword(s):  
Convergence Rates ◽  
Thin Sheet ◽  
Plate Boundary ◽  
Warning System ◽  
Fault Model ◽  
Generation Model ◽  
Gulf Of Cadiz ◽  
Tsunami Warning System ◽  
Seismicity Rates ◽  
Gulf Of Cádiz

Abstract. The Gulf of Cadiz, as part of the Azores-Gibraltar plate boundary, is recognized as a potential source of big earthquakes and tsunamis that may affect the bordering countries, as occurred on 1 November 1755. Preparing for the future, Portugal is establishing a national tsunami warning system in which the threat caused by any large-magnitude earthquake in the area is estimated from a comprehensive database of scenarios. In this paper we summarize the knowledge about the active tectonics in the Gulf of Cadiz and integrate the available seismological information in order to propose the generation model of destructive tsunamis to be applied in tsunami warnings. The fault model derived is then used to estimate the recurrence of large earthquakes using the fault slip rates obtained by Cunha et al. (2012) from thin-sheet neotectonic modelling. Finally we evaluate the consistency of seismicity rates derived from historical and instrumental catalogues with the convergence rates between Eurasia and Nubia given by plate kinematic models.

Tectonic domains of the Betic Foreland System, SW Iberian Margin: Implications for the Gulf of Cadiz Contourite System

2020 ◽  
Author(s):  
Débora Duarte ◽  
Cristina Roque ◽  
F. Javier Hernández-Molina ◽  
Zhi Lin Ng ◽  
Vitor Hugo Magalhães ◽  
...  
Keyword(s):  
Plate Boundary ◽  
Sedimentary Basins ◽  
Rift System ◽  
Gulf Of Cadiz ◽  
Tectonic Structures ◽  
Southern Boundary ◽  
Accommodation Space ◽  
Gulf Of Cádiz ◽  
The Mediterranean ◽  
Depositional Architecture

<p>The southwestern margin of Iberian (SWIM) marks the transition between the Mediterranean Alpine Orogenic Belt and the Atlantic Azores–Gibraltar Fracture Zone, near the diffuse segment of the Africa (Nubia)-Eurasia (Iberia) plate boundary. The Gulf of Cadiz Contourite System (GCCS) has been build-up by the circulation of the Mediterranean Outflow Water (MOW) on the continental middle slope. This work aims to understand how the tectonic structures controlled the development, evolution and morphology of the GCCS. This has been accomplished with the analysis of high quality regional 2D seismic reflection profiles. Four sedimentary basins were mapped in the study area – the Algarve, Doñana, Sanlucar and Cadiz basins – developed in the foreland of the Betic-Rif Orogen. Three major tectonic structures – the Gil Eanes Fault (GEF), Cadiz Fault (CF) and the Albufeira-Guadalquivir-Doñana Basement High (AGDBH) – were identified on the SWIM. The NW-SE-oriented GEF and the NE-SW to ENE-WSW-oriented CF were identified as dextral strike-slip faults. The AGD is an E-W to ENE-WSW elongated morphostructural high that marks the southern boundary of the Algarve Basin. Based on their location and orientation they were interpreted as being inherited structures from the Mesozoic rift system. Based on the described regional structures, the SWIM was divided into four tectonic domains (A, B, C and D) with different structural and seismological characteristics. Contourite depositional and erosional features show different characteristics – distinct size, extension, configuration and depositional architecture - for each of the  tectonic domains recognised. Tectonic-controlled subsidence led to the development of an accommodation space, forming the main depositional sector in the GCCS (Domain C). Contrariwise, where the margin suffered uplift, the accommodation space was limited and the contourite depositional features are not very extensive (Domain D). The presence of structural obstacles (e.g. AGDBH, paleo-slope) is another important factor in the drift evolution: mounded geometries were only observed where important structural obstacles conditioned the current circulation (Domain B, C and D). Where the seafloor is gentle with smooth relief, spread-out MOW circulation occurs, forming sheeted drifts related to weak and wide non-focused bottom-currents (Domain A). This work demonstrates the influence that the inherited tectonic structures and the margin paleo-topography has on the development of the contourite system. Furthermore, we propose that tectonics also control the dimensions and types of the contourite depositional features.</p><p>Acknowledgements: D.D. thanks the Portuguese Foundation for Science and Technology (FCT) for a PhD scholarship (reference SFRH/BD/115962/2016). This research has been conducted under the framework of ‘The Drifters Research Group’, Department of Earth Sciences, Royal Holloway University of London (UK). This project is partially funded by a Joint Industry Project supported by TOTAL, BP, ENI, ExxonMobil, TGS and Wintershall and partially supported through the CGL2016-80445-R (AEI/FEDER, UE), CGL2015-66835-P and CTM2016-75129-C3-1-R.</p>

FORMATION HISTORY AND OCEANOGRAPHIC CONTROL OF LATE HOLOCENE MUD DEPOCENTERS IN THE NORTHEASTERN GULF OF CADIZ, SOUTHERN SPAIN

2016 ◽  
Author(s):  
Mary Lee King ◽  
◽  
Till J.J. Hanebuth ◽  
Francisco Lobo ◽  
Hendrik Lantzsch ◽  
...  
Keyword(s):  
Late Holocene ◽  
Southern Spain ◽  
Gulf Of Cadiz ◽  
Formation History ◽  
Gulf Of Cádiz

Biogeochemistry of surface sediments in mud volcanoes of the Gulf of Cádiz

2021 ◽  
Vol 41 (3) ◽  
Author(s):  
Dolores Jiménez-López ◽  
Ana Sierra ◽  
Teodora Ortega ◽  
Sandra Manzano-Medina ◽  
M. Carmen Fernández-Puga ◽  
...  
Keyword(s):  
Surface Sediments ◽  
Mud Volcanoes ◽  
Gulf Of Cadiz ◽  
Gulf Of Cádiz

scholarly journals Latest Miocene restriction of the Mediterranean Outflow Water: a perspective from the Gulf of Cádiz

2021 ◽  
Vol 41 (2) ◽  
Author(s):  
Zhi Lin Ng ◽  
F. Javier Hernández-Molina ◽  
Débora Duarte ◽  
Francisco J. Sierro ◽  
Santiago Ledesma ◽  
...  
Keyword(s):  
Mass Exchange ◽  
Water Mass ◽  
Atlantic Water ◽  
Meridional Overturning Circulation ◽  
Gulf Of Cadiz ◽  
Mediterranean Outflow Water ◽  
Gulf Of Cádiz ◽  
Mediterranean Outflow ◽  
The Mediterranean ◽  
Water Mass Exchange

AbstractThe Mediterranean-Atlantic water mass exchange provides the ideal setting for deciphering the role of gateway evolution in ocean circulation. However, the dynamics of Mediterranean Outflow Water (MOW) during the closure of the Late Miocene Mediterranean-Atlantic gateways are poorly understood. Here, we define the sedimentary evolution of Neogene basins from the Gulf of Cádiz to the West Iberian margin to investigate MOW circulation during the latest Miocene. Seismic interpretation highlights a middle to upper Messinian seismic unit of transparent facies, whose base predates the onset of the Messinian salinity crisis (MSC). Its facies and distribution imply a predominantly hemipelagic environment along the Atlantic margins, suggesting an absence or intermittence of MOW preceding evaporite precipitation in the Mediterranean, simultaneous to progressive gateway restriction. The removal of MOW from the Mediterranean-Atlantic water mass exchange reorganized the Atlantic water masses and is correlated to a severe weakening of the Atlantic Meridional Overturning Circulation (AMOC) and a period of further cooling in the North Atlantic during the latest Miocene.

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