Extension and inversion structures in the Tethys–Atlantic linkage zone, Algarve Basin, Portugal

Ramos, Adrià; Fernández, Òscar; Terrinha, Pedro; Muñoz, Josep Antón

doi:10.1007/s00531-015-1280-1

Cited by 40 publications

(47 citation statements)

References 29 publications

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“…Geological data from Iberia and Africa show a set of NE to ENE trending "en echelon" Mesozoic basins, which were more or less subject to tectonic inversion during the Cenozoic. These basins are: the Algarve (Ramos et al, 2016;2017a, 2017b and Subbetic (García-Hernández et al, 1989;Vera, 2001) basins on the Iberian side and the Khemisset-Rif (Favre, 1995;Favre et al, 1991), Middle-Atlas, High-Atlas, Sahara-Atlas and TunisiaAtlas basins on the African side (Frizon de Lamotte et al, 2000, 2009 and references therein; Fig. 5A).…”

Section: Oceanization Steps In the Tethys Realmmentioning

confidence: 99%

“…More precisely, it corresponds to an orogenic climax in the Pyrenees (Vergés and García-Senz, 2001) (the concept of Pyrenean phase), the Iberian Chain (Guimerá et al, 2004), the Catalan Coastal range (López-Blanco et al, 2000) and in Southern Portugal (Algarve region: Ramos et al, 2016, Ramos et al, 2017a. Mirroring the Iberian intra-plate deformations, North Africa also recorded a strong middle-upper Eocene intraplate compressional event, present at the scale of the whole Atlas belt (the concept of "Atlas event" [Frizon de Lamotte et al, 2000, 2009, 2011).…”

Section: The Middle-late Eocene Tectonic Crisismentioning

confidence: 99%

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The Tell-Rif orogenic system (Morocco, Algeria, Tunisia) and the structural heritage of the southern Tethys margin

Leprêtre

Lamotte

Combier

et al. 2018

BSGF - Earth Sci. Bull.

105

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-The Tell-Rif (Tell in Algeria and Tunisia; Rif in Morocco) is the orogenic system fringing to the south the West Mediterranean basins. This system comprises three major tectonic-palaeogeographic zones from north to south: (1) the internal zones (AlKaPeCa for Alboran, Kabylies, Peloritan, Calabria) originating from the former northern European margin of the Maghrebian Tethys, (2) the "Flyschs zone" regarded as the former cover of the oceanic domain and (3) the external zones, forming the former southern Maghrebian Tethys margin more or less inverted. The Tell-Rif is interpreted as the direct result of the progressive closure of the Maghrebian Tethys until the collision between AlKaPeCa and Africa and, subsequently, the propagation of the deformation within Africa. This gives a consistent explanation for the offshore Neogene geodynamics and most authors share this simple scenario. Nevertheless, the current geodynamic models do not completely integrate the Tell-Rif geology. Based on the analysis of surface and sub-surface data, we propose a reappraisal of its present-day geometry in terms of geodynamic evolution. We highlight its non-cylindrical nature resulting from both the Mesozoic inheritance and the conditions of the tectonic inversion. During the Early Jurassic, we emphasize the development of NE-SW basins preceding the establishment of an E-W transform corridor connecting the Central Atlantic Ocean with the Ligurian Tethys. The Maghrebian Tethys developed just after, as the result of the Late Jurassic-Early Cretaceous left-lateral spreading between Africa and Iberia. By the Late Cretaceous, the occurrence of several tectonic events is related to the progressive convergence convergence between the two continents. A major pre-Oligocene (pre-35 Ma) compressional event is recorded in the Tell-Rif system. The existence of HP-LT metamorphic rocks associated with fragments of mantle in the External Metamorphic Massifs of the Eastern Rif and Western Tell shows that, at that time, the western part of the North-African margin was involved in a subduction below a deep basin belonging to the Maghrebian Tethys. At the same time, the closure of the West Ligurian Tethys through east-verging subduction led to a shift of the subduction, which jumped to the other side of AlKaPeCa involving both East Ligurian and Maghrebian Tethys. Slab rollback led to the development of the Oligo-Miocene back-arc basins of the West-Mediterranean, reworking the previous West Ligurian Tethys suture. The docking of AlKaPeCa against Africa occurred during the Late Burdigalian (17 Ma). Subsequently, the slab tearing triggered westward and eastward lateral movements that are responsible for the formation of the Gibraltar and Tyrrhenian Arcs respectively. The exhumation of the External Metamorphic Massifs occurred through tectonic underplating during the westward translation of the Alboran Domain. It resulted in the formation of both foredeep and wedge-top basins younger and younger westward. The lack of these elements in the eastern part ...

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Section: Oceanization Steps In the Tethys Realmmentioning

confidence: 99%

Section: The Middle-late Eocene Tectonic Crisismentioning

confidence: 99%

The Tell-Rif orogenic system (Morocco, Algeria, Tunisia) and the structural heritage of the southern Tethys margin

Leprêtre

Lamotte

Combier

et al. 2018

BSGF - Earth Sci. Bull.

105

View full text Add to dashboard Cite

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“…The evolution of the basin has been documented by many authors; the description contained here is derived from the work of Ramos et al (2016) and Terrinha (1998) Magmatic Province (CAMP; e.g., Martins et al, 2008). Sinemurian to Toarcian sediments blanket the isolated basins of the first phase of extension and record progressive deepening of the basin.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…The seismic interpretation is tied to onshore geology (Ramos et al, 2016), to 5 wells in the Portuguese offshore (Roque, 2007) and up to 39 wells in the Spanish Gulf of Cadiz area (Lanaja, 1987) (Fig. 4).…”

Section: Reflection Seismic and Hydrocarbon Exploratory Wellsmentioning

confidence: 99%

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Crustal structure of the SW Iberian passive margin: The westernmost remnant of the Ligurian Tethys?

et al. 2017

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At present, the SW Iberian margin is located along the convergent Iberia-Nubia plate boundary. In Mesozoic times, the margin was located at the triple junction of the Ligurian Tethys, Central Atlantic and Northern Atlantic. The characterization of its crustal structure has allowed us to propose a configuration for this triple junction and to determine the role that this transform margin played within the plate kinematic system. In this paper we present an integrated study based on the interpretation of a 2D regional multichannel seismic survey consisting of 58 profiles, tied with onshore geology and exploratory wells, and on gravimetric modeling performed over four NW-SE trending profiles.

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Neogene to recent contraction and basin inversion along the Nubia-Iberia boundary in SW Iberia

et al. 2017

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The SW of Iberia is currently undergoing compression related to the convergence between Nubia and Iberia. Multiple compressive structures, and their related seismic activity, have been documented along the diffuse Nubia‐Iberia plate boundary, including the Gorringe bank west of the Gulf of Cadiz, and the Betic‐Rif orogen to the east. Despite seismic activity indicating a dominant compressive stress along the Algarve margin in the Gulf of Cadiz, the structures at the origin of this seismicity remain elusive. This paper documents the contractional structures that provide linkage across the Gulf of Cadiz and play a major role in defining the present‐day seismicity and bathymetry of this area. The structures described in this paper caused the Neogene inversion of the Jurassic oblique passive margin that formed between the central Atlantic and the Ligurian Tethys. This example of a partially inverted margin provides insights into the factors that condition the inversion of passive margins.

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Extension and inversion structures in the Tethys–Atlantic linkage zone, Algarve Basin, Portugal

Cited by 40 publications

References 29 publications

The Tell-Rif orogenic system (Morocco, Algeria, Tunisia) and the structural heritage of the southern Tethys margin

The Tell-Rif orogenic system (Morocco, Algeria, Tunisia) and the structural heritage of the southern Tethys margin

Crustal structure of the SW Iberian passive margin: The westernmost remnant of the Ligurian Tethys?

Neogene to recent contraction and basin inversion along the Nubia-Iberia boundary in SW Iberia

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