The structure of the Temsamane fold-and-thrust stack (eastern Rif, Morocco): Evolution of a transpressional orogenic wedge

Jabaloy‐Sánchez, Antonio; Azdimousa, Ali; Booth‐Rea, Guillermo; Asebriy, L.; Vázquez-Vílchez, Mercedes; Martı́nez-Martı́nez, José Miguel; Gabites, Janet

doi:10.1016/j.tecto.2015.02.003

Cited by 34 publications

(40 citation statements)

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“…We propose a two-steps scenario for the exhumation, which globally occurred in a context of left-lateral movement (Booth-Rea et al, 2012;Frizon de Lamotte andLeikine, 1985, 1987;Frizon de Lamotte et al, 1991;Jabaloy-Sánchez et al, 2015;Negro et al, 2007Negro et al, , 2008. In our view, after the subduction stage (Fig.…”

Section: "Collision" and Lateral Slab Tearing Along The African Marginmentioning

confidence: 88%

“…2 and 3). These so-called External Metamorphic Massifs (EMM) comprise the Temsamane Massif (Andrieux, 1971;Frizon de Lamotte andLeikine, 1985, 1987) in the Eastern Rif and the Oran (Ciszak, 1993;Fenet, 1975;Guardia, 1975), Chelif (Lepvrier, 1978) and Blida (Bles, 1971) Leikine, 1985Leikine, , 1987Frizon de Lamotte et al, 1991;Jabaloy-Sánchez et al, 2015;Negro et al, 2007Negro et al, , 2008. They are made up of a stack of tectonic slices with Paleozoic rocks exhibiting HP-LT metamorphic type (7-9 kbar and 330-430°C; Negro et al, 2007) at the top of the system.…”

Section: The External Domainsmentioning

confidence: 99%

“…and Lower Miocene conglomerates rest unconformably over the older Mesozoic rocks (Favre, 1995;Favre et al, 1991;Leblanc, 1979;Marçais, 1936;Vidal, 1971). The subsequent exhumation of the Temsamane, occurring in a transcurrent context, is dated as Langhian to Late Serravalian/ Early Tortonian (Frizon de Lamotte, 1987;Negro et al, 2008;Jabaloy-Sánchez et al, 2015). The deformation of the Mesorif is better correlated to a Late Eocene-earliest Oligocene deformation with a stratigraphic gap from the Early to the Late Oligocene.…”

Section: Mamentioning

confidence: 99%

“…4). These considerable movements explain why the Rif displays a particularly complex structure with a frontal wedge in its western part whereas a combination of compressive and strike-slip structures gives its structural complexity to the eastern Rif (Frizon de Lamotte and Leikine, 1985Leikine, , 1987Jabaloy-Sánchez et al, 2015).…”

Section: The Tell-rif: a Fundamentally Non-cylindrical Beltmentioning

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.

102

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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: "Collision" and Lateral Slab Tearing Along The African Marginmentioning

confidence: 88%

Section: The External Domainsmentioning

confidence: 99%

Section: Mamentioning

confidence: 99%

Section: The Tell-rif: a Fundamentally Non-cylindrical Beltmentioning

confidence: 99%

See 2 more Smart Citations

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.

102

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“…We interpret that this region forms a continental domain, although it has been affected by arc‐related volcanism at the edge of the continental margin (Figure , CMPs 8000–2000). Transpressive deformation occurred in the Late Oligocene‐Middle Miocene (~33–13 Ma, Booth‐Rea et al, ; Jabaloy‐Sánchez et al, ; Negro et al, ), followed by tectonic denudation during the Late Serravallian‐Tortonian (~12–7 Ma, Booth‐Rea et al, ). This deformation can be explained by strike‐slip tectonics affecting the NAM, due to the westward migration of the slab (e.g., van Hinsbergen et al, ).…”

Section: Discussionmentioning

confidence: 99%

The Crustal Domains of the Alboran Basin (Western Mediterranean)

2018

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The Alboran Basin in the westernmost Mediterranean hosts the orogenic boundary between the Iberian and African plates. Although numerous geophysical studies of crustal structure onshore Iberia have been carried out during the last decade, the crustal structure of the Alboran Basin has comparatively been poorly studied. We analyze crustal-scale images of a grid of new and reprocessed multichannel seismic profiles showing the tectonic structure and variations in the reflective character of the crust of the basin. The nature of the distinct domains has been ground-truthed using available basement samples from drilling and dredging. Our results reveal four different crustal types-domains-of the Alboran Basin: (a) a thin continental crust underneath the West Alboran and Malaga basins, which transitions to (b) a magmatic arc crust in the central part of the Alboran Sea and the East Alboran Basin; (c) the North African continental crust containing the Pytheas and Habibas subbasins; and (d) the oceanic crust in the transition toward the Algero-Balearic Basin. The Alboran Basin crust is configured in a fore-arc basin (West Alboran and Malaga basins), a magmatic arc (central and East Alboran), and a back-arc system in the easternmost part of the East Alboran Basin and mainly Algero-Balearic Basin. The North African continental crust is influenced by arc-related magmatism along its edge and was probably affected by strike-slip tectonics during westward migration of the Miocene subduction system. The distribution of active tectonic structures in the current compressional setting generally corresponds to boundaries between domains, possibly representing inherited lithospheric-scale weak structures.Here we present the first comprehensive study of the Alboran Basin crust characterization derived from MCS images, originally designed and acquired with the objective of imaging the full crustal structure, and GÓMEZ DE LA PEÑA ET AL. 3352

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