Eastern segment of the Azores-Gibraltar line (central-eastern Atlantic) : An oceanic plate boundary with diffuse compressional deformation

Sartori, R.; Torelli, L.; Zitellini, Nevio; Peis, Davide; Lodolo, Emanuele

doi:10.1130/0091-7613(1994)022<0555:esotag>2.3.co;2

Cited by 153 publications

(139 citation statements)

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“…(b) Gutscher et al (2002) considered that ill the Gulf of Cidiz, these allochthonous masses represent an active accretionary complex related to a narr ow east-dipping slab of oceanic lithosphere west of the Gibraltar Arc, under the Alboran Sea. (c) Sartori et al (1994) suggested that ill the distal margin and Atlantic basill plains there is no subduction-related deformation, but the stresses are released across a 200-km area between the Seine Abyssal Plain and the Gorringe Bank, without a defined plate margin. V:izquez and Vegas (2000) also supported a diffuse contractive deforma tion of the lithosphere due to the African -Iberia convergence.…”

Section: Seine Abyssal Plainmentioning

confidence: 99%

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Structure and evolution of the “Olistostrome” complex of the Gibraltar Arc in the Gulf of Cádiz (eastern Central Atlantic): evidence from two long seismic cross-sections

et al. 2004

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Reflection profiles characterize the structure and the upper Mesozoic to Cenozoic deposits of the Gulf of Ciidiz region. Two long ENE-WSW multichannel seismic lines (ca. 400-500 km long) are analyzed to study the evolution of the area from the continental shelf to the Horseshoe and Seine abyssal plains. The huge allochthonous deposits emplaced in this region (the so called "Olistostrome" of the Gulf of Cadiz) are described in terms of three different domains on the basis of the seismic architecture, the main tectonic features and the nature of the basement, oceanic or continental. The eastern domain extends along the continental shelf and upper and middle slope and corresponds to the offshore extension of the Betic -Rifean external front. It is characterized by salt and shale nappes later affected by extensional collapses. The central domain develops along the lower slope between the Betic-Rifean front and the abyssal plains and is characterized by a change in dip of the allochthonous basal surface and the basement. The allochthonous masses were emplaced by a combined gravitational and tectonic mechanism.The nOlihern boundary of this domain is marked by the occurrence of an outstanding WNW -ESE-trending thrust fault with a strike-slip component, termed here as the Gorringe-Horseshoe fault. The westernmost domain corresponds to the abyssal plains, where the distal emplacement of the allochthonous body takes place; it is characterized by thrust faults affecting both the sedimentary cover and the oceanic basement. The allochthonous masses show a less chaotic character and the thickness decreases notably. These domains represent different evolutionary steps in the mechanisms of emplacement of the allochthonous units. The eastern domain of the allochthonous units was emplaced as part of the pre-Messinian orogenic wedge related to the collision that gave rise to the Betic-Rifean Belt, whereas the allochthonous wedge of the central and western domains were emplaced later as a consequence of the NE-SW late Miocene compression that continues in present times.

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Section: Seine Abyssal Plainmentioning

confidence: 99%

“…I ), that registered 14 s TWT (Gontillez et aI., 1996;Tortella et aI., 1997). In fact, the Moho discontinuity has been identifi ed by Sartori et al (1994) at about 11 s (TWT) near the basin plain. Shortening is expressed in the sedimentary cover as symmetric folds.…”

Section: The Horseshoe Abyssal Plainmentioning

confidence: 99%

Structure and evolution of the “Olistostrome” complex of the Gibraltar Arc in the Gulf of Cádiz (eastern Central Atlantic): evidence from two long seismic cross-sections

et al. 2004

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“…One of the most important features is a large olistostrome complex emplaced in an accretionary wedge-type environment (Sartori et al, 1994;Maldonado et al, 1999;Gutscher et al, 2002) that favours the occurrence of seepage-related geomorphological features such as the mud volcanoes. Since the discovery of the first underwater mud volcano in the Gulf of Cadiz in 1999 (Gardner, 2000(Gardner, , 2001, about 30 other sites at depths ranging from 200 to 3900 m have been located and sampled under the IOC-UNESCO 'Training Through Research (TTR) Programme' (Pinheiro et al, 2003;Van Rensbergen et al, 2005) and more recently the EU funded HERMES project.…”

Section: Study Areamentioning

confidence: 99%

Tubiclavoides striatum gen. nov. et sp. nov. (Cnidaria: Hydrozoa) a new bathyal hydroid from the Gulf of Cadiz, north-east Atlantic Ocean

2007

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Tubiclavoides striatum gen. nov. et sp. nov. (Cnidaria: Hydrozoa) a new bathyal hydroid from the Gulf of Cadiz, north-east Atlantic OceanTubiclavoides striatum, a new species of an athecate hydroid, was found on mud volcanoes, inactive carbonate chimneys, and cold-water coral stands in the Gulf of Cadiz (south-western Iberian Peninsula, Atlantic Ocean). The new family Tubiclavoididae and the new genus Tubiclavoides are proposed to accommodate the new species. The new hydroid is characterized by scattered filiform tentacles, sporosacs developing among the tentacles and hydrocauli covered with striated perisarc, often subdivided into imbricating cones. A full description and illustrations are provided, as well as some notes on the ecology and distribution of the new species.

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“…located in a compressional tectonic province, the mud volcanoes in the Gulf of Cadiz are more numerous than anywhere else on the European Atlantic margins. The compression between the Eurasian and African tectonic plates creates an interesting geophysical template (Sartori et al, 1994;Maldonado et al, 1999;Gutcher et al, 2002) shaped by volcanic activity and by the interaction between the topography and the circulation of the Atlantic and Mediterranean Waters (Peliz et al, 2007). Found in water depths between 200 and 4000 m, these mud volcanoes are clustered in several fields on the Portuguese, Spanish, and Moroccan margins and show considerable variations in dimension, morphology and composition of erupted material and fuids (Pinheiro et al, 2003;Van rensbergen et al, 2005;Hensen et al, 2007;niemann et al, 2006).…”

Section: Study Areamentioning

confidence: 99%

Sobre algunas especies de frenulados (Annelida: Polychaeta: Siboglinidae) de los volcanes de fango en el golfo de Cádiz (NE Atlántico)

Hilario¹,

Ravara²

2008

Sci. Mar.

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SuMMArY: Collections of Frenulata made by the rV Professor logachev in the Gulf of Cadiz in 2006 contain two new species, one belonging to the genus Spirobrachia, and another that was assigned to a new genus. Spirobrachia tripeira n. sp. is the first record of the genus in the north Atlantic ocean; it has a very stiff, straight, orange tube; its tentacles have pinnules and are arranged in a spiral crown without a lophophore. Bobmarleya gadensis n. gen. et n. sp. is characterised by an unusually long tentacular crown composed of about 40 free tentacles. it shares many characteristics with the genus Oligobrachia but the large number and extreme length of the tentacles and a combination of other characters justify the designation of a new genus. The specimens of Lamellisabella denticulata Southward, 1978 collected during the M.S. Merian 03/01 cruise provide the first record of this species in the Gulf of Cadiz.

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Eastern segment of the Azores-Gibraltar line (central-eastern Atlantic) : An oceanic plate boundary with diffuse compressional deformation

Cited by 153 publications

References 0 publications

Structure and evolution of the “Olistostrome” complex of the Gibraltar Arc in the Gulf of Cádiz (eastern Central Atlantic): evidence from two long seismic cross-sections

Structure and evolution of the “Olistostrome” complex of the Gibraltar Arc in the Gulf of Cádiz (eastern Central Atlantic): evidence from two long seismic cross-sections

Tubiclavoides striatum gen. nov. et sp. nov. (Cnidaria: Hydrozoa) a new bathyal hydroid from the Gulf of Cadiz, north-east Atlantic Ocean

Sobre algunas especies de frenulados (Annelida: Polychaeta: Siboglinidae) de los volcanes de fango en el golfo de Cádiz (NE Atlántico)

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