Characterization of storm events along the Gulf of Cadiz (eastern central Atlantic Ocean)

2015 ◽  
Vol 36 (11) ◽  
pp. 3690-3707 ◽  
Author(s):  
G. Anfuso ◽  
N. Rangel-Buitrago ◽  
C. Cortés-Useche ◽  
B. Iglesias Castillo ◽  
F.J. Gracia
Keyword(s):  
Atlantic Ocean ◽  
Storm Events ◽  
Gulf Of Cadiz ◽  
Gulf Of Cádiz ◽  
Central Atlantic

scholarly journals Evidence of Hydrocarbon-Rich Fluid Interaction with Clays: Clay Mineralogy and Boron Isotope Data from Gulf of Cádiz Mud Volcano Sediments

Minerals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 651
Author(s):  
Rubén Martos-Villa ◽  
M. Pilar Mata ◽  
Lynda B. Williams ◽  
Fernando Nieto ◽  
Xabier Arroyo Rey ◽  
...  
Keyword(s):  
Density Functional ◽  
Clay Mineralogy ◽  
Great Depth ◽  
Gulf Of Cadiz ◽  
Dft Methods ◽  
Methane Generation ◽  
Tetrahedral Sites ◽  
Gulf Of Cádiz ◽  
Fluid Interaction

Clay dehydration at great depth generates fluids and overpressures in organic-rich sediments that can release isotopically light boron from mature organic matter, producing 10B-rich fluids. The B can be incorporated into the tetrahedral sites of authigenic illite during the illitization of smectite. Therefore, the crystal-chemical and geochemical characterization of illite, smectite or interlayered illite–smectite clay minerals can be an indicator of depth (temperature) and reactions with the basin fluids. The aim of this study was to determine the detailed clay mineralogy, B-content and isotopic composition in illite–smectite rich samples of mud volcanoes from the Gulf of Cádiz, in order to evaluate interactions of hydrocarbon-rich fluids with clays. Molecular modeling of the illite structure was performed, using electron density functional theory (DFT) methods to examine the phenomenon of B incorporation into illite at the atomic level. We found that it is energetically preferable for B to reside in the tetrahedral sites replacing Si atoms than in the interlayer of expandable clays. The B abundances in this study are high and consistent with previous results of B data on interstitial fluids, suggesting that hydrocarbon-related fluids approaching temperatures of methane generation (150 °C) are the likely source of B-rich illite in the studied samples.

scholarly journals The Interactive Role of Hydrocarbon Seeps, Hydrothermal Vents and Intermediate Antarctic/Mediterranean Water Masses on the Distribution of Some Vulnerable Deep-Sea Habitats in Mid Latitude NE Atlantic Ocean

Oceans ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 351-385
Author(s):  
Luis Somoza ◽  
José L. Rueda ◽  
Olga Sánchez-Guillamón ◽  
Teresa Medialdea ◽  
Blanca Rincón-Tomás ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Deep Sea ◽  
Hydrothermal Vents ◽  
Water Masses ◽  
Gulf Of Cadiz ◽  
Ne Atlantic ◽  
Hydrocarbon Seeps ◽  
Gulf Of Cádiz ◽  
Ne Atlantic Ocean ◽  
Deep Sea Corals

In this work, we integrate five case studies harboring vulnerable deep-sea benthic habitats in different geological settings from mid latitude NE Atlantic Ocean (24–42° N). Data and images of specific deep-sea habitats were acquired with Remoted Operated Vehicle (ROV) sensors (temperature, salinity, potential density, O2, CO2, and CH4). Besides documenting some key vulnerable deep-sea habitats, this study shows that the distribution of some deep-sea coral aggregations (including scleractinians, gorgonians, and antipatharians), deep-sea sponge aggregations and other deep-sea habitats are influenced by water masses’ properties. Our data support that the distribution of scleractinian reefs and aggregations of other deep-sea corals, from subtropical to north Atlantic could be dependent of the latitudinal extents of the Antarctic Intermediate Waters (AAIW) and the Mediterranean Outflow Waters (MOW). Otherwise, the distribution of some vulnerable deep-sea habitats is influenced, at the local scale, by active hydrocarbon seeps (Gulf of Cádiz) and hydrothermal vents (El Hierro, Canary Island). The co-occurrence of deep-sea corals and chemosynthesis-based communities has been identified in methane seeps of the Gulf of Cádiz. Extensive beds of living deep-sea mussels (Bathymodiolus mauritanicus) and other chemosymbiotic bivalves occur closely to deep-sea coral aggregations (e.g., gorgonians, black corals) that colonize methane-derived authigenic carbonates.

scholarly journals Contribution of storms to shoreline changes in mesotidal dissipative beaches: case study in the Gulf of Cádiz (SW Spain)

2016 ◽  
Vol 16 (12) ◽  
pp. 2543-2557 ◽  
Author(s):  
María Puig ◽  
Laura Del Río ◽  
Theocharis A. Plomaritis ◽  
Javier Benavente
Keyword(s):  
Shoreline Change ◽  
High Water ◽  
Aerial Photographs ◽  
Anthropogenic Factors ◽  
Storm Events ◽  
Gulf Of Cadiz ◽  
Shoreline Changes ◽  
Sw Spain ◽  
Gulf Of Cádiz ◽  
Coastal Changes

Abstract. In this study an analysis of storminess and rates of shoreline change is performed and discussed jointly in four geomorphological units of the Gulf of Cádiz (SW Spain) for the period of 1956–2010. For this purpose, storm events are identified based on the following characteristics: wave height above 2.5 m, a minimum duration of 12 h and events with calm periods of less than 24 h were considered as a single event. Subsequently, energy parameters are determined in order to characterize storm-induced impacts. Conversely, geographic information system (GIS) tools are used to measure shoreline changes in aerial photographs and orthophotographs of each site, selecting the high water line as shoreline proxy. Each geomorphological unit is divided into different behavioural patterns according to recorded coastal changes, so that each one shows a particular behaviour.In general the variability of shoreline changes that is explained by storms and the relation between storm parameters and coastal changes present better results in exposed areas (Cádiz and Vistahermosa) than in sheltered areas (Valdelagrana spit barrier) because the former are more sensitive to storm impacts. On the contrary, in areas where there is no relation between coastal changes and storm parameters (Valdelagrana and Sancti Petri sand spit), it is suggested that anthropogenic factors are the main forcing agents determining shoreline behaviour. However, in these areas the storminess also modulates coastline recession by increasing erosion when the number of storms is high.

scholarly journals Multidisciplinary characterization of Quaternary mass movement deposits in the Portimão Bank (Gulf of Cadiz, SW Iberia)

2020 ◽  
Vol 420 ◽  
pp. 106086
Author(s):  
P.F. Silva ◽  
C. Roque ◽  
T. Drago ◽  
A. Belén ◽  
B. Henry ◽  
...  
Keyword(s):  
Mass Movement ◽  
Gulf Of Cadiz ◽  
Gulf Of Cádiz

Spatial characterization of megabenthic epifauna of soft bottoms around mud volcanoes in the Gulf of Cádiz

2013 ◽  
Vol 47 (25-28) ◽  
pp. 1803-1831 ◽  
Author(s):  
Marina Delgado ◽  
José Luis Rueda ◽  
Juan Gil ◽  
Candelaria Burgos ◽  
Ignacio Sobrino
Keyword(s):  
Mud Volcanoes ◽  
Gulf Of Cadiz ◽  
Spatial Characterization ◽  
Gulf Of Cádiz ◽  
Soft Bottoms
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