Extensional tectonics, graben development and fault terminations in the eastern Rif (Bokoya–Ras Afraou area)

Galindo-Zaldı́var, Jesús; Azzouz, Omar; Chaloüan, Ahmed; Pedrera, Antonio; Ruano, Patricia; Ruíz-Constán, Ana; Galdeano, Carlos Sanz de; Marín‐Lechado, Carlos; López-Garrido, A. C.; Anahnah, Farida; Benmakhlouf, M.

doi:10.1016/j.tecto.2015.08.029

Cited by 29 publications

(35 citation statements)

References 40 publications

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“…) and inactive faults east of the Trougout fault are compatible with the results of onshore field studies showing a Plio‐Quaternary E–W extension (e.g. Aït Brahim & Chotin, ; Galindo‐Zaldívar et al ., ). The extensional deformation of U1 and U2 is distributed over a great number of faults, and is not localized within the present‐day limits of the basin (Fig.…”

Section: Discussionmentioning

confidence: 97%

“…() proposed a regularly decreasing uplift rate for the Ras Tarf province, from about 0.45 mm/yr 500 ky ago, to 0.2 mm/yr between 200ky and 120ky ago, and to 0.13 mm/yr since 120ky. Most recent field studies found NWW–SSE extensional structures affecting the Messinian and Pliocene sediments (Galindo‐Zaldívar et al ., ). The beginning of subsidence inside the Nekor basin has not been accurately dated.…”

Section: Geological Settingmentioning

confidence: 97%

“…This major left‐lateral strike‐slip fault is considered as the southern boundary of the Nekor basin, and has accommodated 50 km of lateral displacement during the E–W Miocene extension (Leblanc & Olivier, ). Plio‐Quaternary deformation recorded in sediments onshore in the Boudinar and in the Nekor basins indicates a Plio‐Quaternary E–W to ENE–WSW extension (Aït Brahim & Chotin, ; Asebriy et al ., ; Galindo‐Zaldívar et al ., ). Several field studies have proposed that only the segment of the Nekor fault located west of the Bou‐Haddad fault is still active today (Hatzfeld et al ., ; Poujol et al ., ; van der Woerd et al ., ).…”

Section: Geological Settingmentioning

confidence: 99%

“…() proposed that this could be the results of overlying detachments blinding the fault. From the inversion of moment tensor, most of the authors agree on a local strike‐slip stress field near Al‐Hoceima with a Sh max roughly oriented N150°±20° (Medina, ; Calvert et al ., ; El Alami et al ., ; Bezzeghoud & Buforn, ; Stich et al ., , , ; Palano et al ., ; Ousadou et al ., ; van der Woerd et al ., ) and a NE–SW direction of extension, in accordance with N145° open joints found in Quaternary breccia near the northern tip of the Imzouren fault (Galindo‐Zaldívar et al ., ). The seismicity and the modelling of the local stress field show that the latter is rotated around Al‐Hoceima with respect to the far field stress direction given by direction of Eurasia/Africa convergence (Fadil et al ., ; Fernández‐Ibáñez et al ., ; Perouse et al ., ; Pedrera et al ., ; Cunha et al ., ; Palano et al ., ; Ousadou et al ., ).…”

Section: Geological Settingmentioning

confidence: 99%

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Evidence of quaternary transtensional tectonics in the Nekor basin (NE Morocco)

et al. 2016

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International audienceThe geodynamic processes in the western Mediterranean are driven by both deep (mantle) processes such as slab-rollback or delamination, oblique plate convergence and inherited structures. The present-day deformation of the Alboran Sea and in particular the Nekor basin area is linked to these coeval effects. The seismically active Nekor basin is an extensional basin formed in a convergent setting at the eastern part of the Rif Chain whose boundaries extend both onshore and offshore Morocco. We propose a new structural model of the Nekor basin based on high-resolution offshore data compiled from recent seismic reflection profiles, swath bathymetry acquisitions and industrial seismic reflection profiles. The new data set shows that the northern limit of the basin is oriented N49° with right-stepping faults from the Bousekkour–Aghbal fault to the sinistral Bokkoya fault zone. This pattern indicates the presence of an inherited left-lateral basement fault parallel to the major inherited Nekor fault. This fault has been interpreted as a Quaternary active left-lateral transfer fault localized on weak structural discontinuities inherited from the orogenic period. Onshore and offshore active faults enclose a rhombohedral tectonic Nekor Basin. Normal faults oriented N155° offset the most recent Quaternary deposits in the Nekor basin, and indicate the transtensional behaviour of this basin. The geometry of these faults suggests a likely rollover structure and the presence at depth of a crustal detachment. Inactive Plio-Quaternary normal faults to the east of the Ras Tarf promontory and geometries of depocentres seem to indicate the migration of deformation from east to west. The local orientations of horizontal stress directions deduced from normal fault orientations are compatible with the extrusion of the Rifian units and coherent with the westward rollback of the Tethyan slab and the localization of the present-day slab detachment or delamination

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Section: Discussionmentioning

confidence: 97%

Section: Geological Settingmentioning

confidence: 97%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

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Evidence of quaternary transtensional tectonics in the Nekor basin (NE Morocco)

et al. 2016

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“…Les formations post nappes correspondent aux bassins post nappes de Boudinar (tortono-messinien) avec le volcanisme de Ras Tarf qui est un massif andésitique d'âge miocène (première manifestation volcanique qui affecte la marge méditerranéenne marocaine postérieurement aux phases majeures de l'orogenèse alpine lié à un modèle de subduction ) et celui du bassin d'Al Hoceima (baie de nekor) à remplissage quaternaire. [10,4,8,11,12,13,5,14,6].…”

Section: Cmss-2017unclassified

Analysis of the recent Plio-Quaternary deformation and the correlation with the focal mechanisms of the significant earthquakes in the Bokoya, Ras Tarf (Eastern Rif)

Mahsani

Brahim

2018

MATEC Web Conf.

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Abstract. Relative movements of microplates developed between the African and Eurasian plate characterize the continuity of the tectonic movements in Westerner of the Mediterranean Sea. The convergence movements between these plates, at the origin of the current structuring in oriental Rif. The recent tectonics in the south ripple of Alboran Sea, translated by an important seismic activity, In the North of Morocco, exactly in the Al Hoceima region, considered as zone of plates border with important seismicity. The structural analysis made in this paper and the interpretation of focals mechanisms earthquakes characteristics in the Al Hoceima region, has allows to deduct the main directions of faults, which we compared with the results of the satellite images. This study we has provides to demonstrate the directions of faults which are able to generate earthquakes in the future. The direction NE-SW represents the overall faults dominant in oriental Rif, this major direction coincides with the breaks of surface. A reduced number of faults shows a generall direction NNE-SSO to N-S through the Quaternary formations in the NO of Al Hoceima city, the direction NO does not show a good correlation with the directions of surface rupture, as well as with the deducted directions from focals mechanisms. This study drives us to propose that faults of direction NNE-SSO to NE-SO, represent the major directions of the faults in the Al Hoceima region, which represents the main cause of the seismic activity in the region.

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From Extension to Shortening: Tectonic Inversion Distributed in Time and Space in the Alboran Sea, Western Mediterranean

et al. 2017

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2D seismic reflection data tied to biostratigraphical and log information from wells in the central and southeastern Alboran Sea have allowed us to constrain the spatial and temporal distribution of rifting and inversion. Normal faults, tilted basement blocks, and growth wedges reveal a thinned continental crust that formed in response to NW‐SE extension. To the east, a secondary SW‐NE trend of extension affects the transitional crust adjacent to the oceanic Algerian Basin. The maximum thickness of syn‐rift sediments is ~3.5 km, and the oldest recorded deposits are Serravallian. The WNW‐ESE Yusuf fault formed a buttress separating and accommodating variable extension between two different tectonic domains: the thinned continental crust of Alboran and the oceanic spreading of the Algerian Basin. Late Tortonian to present‐day NW‐SE Africa/Eurasia plate convergence drove shortening and reactivation of some of the earlier extensional structures as reverse and strike‐slip faults, forming complex, compartmentalised subbasins. Tectonic inversion coexisted with the formation of new faults and folds. Inversion was partial along the Habibas Basin and Al‐Idrisi fault, but complete along the Alboran Ridge, where some SW‐NE trending faults were perpendicular to the recent NW‐SE plate convergence and were reactivated as thrusts. The WNW‐ESE Yusuf fault is oblique to the convergence vector, and therefore, reactivation is mainly expressed as transpressional deformation. Volcanic rocks intruded along the Alboran Ridge and Yusuf faults during the latest stages of extension formed rheological anisotropies that localised the later inversion.

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Extensional tectonics, graben development and fault terminations in the eastern Rif (Bokoya–Ras Afraou area)

Cited by 29 publications

References 40 publications

Evidence of quaternary transtensional tectonics in the Nekor basin (NE Morocco)

Evidence of quaternary transtensional tectonics in the Nekor basin (NE Morocco)

Analysis of the recent Plio-Quaternary deformation and the correlation with the focal mechanisms of the significant earthquakes in the Bokoya, Ras Tarf (Eastern Rif)

From Extension to Shortening: Tectonic Inversion Distributed in Time and Space in the Alboran Sea, Western Mediterranean

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