Mohamed larbi. Bouybaouene

• Mohammed V University

High‐resolution microstructural analysis of porphyroblast inclusion trails integrated with Sm‐Nd garnet geochronology has provided new insight into the tectonic history of the Betic‐Rif orogen. Three principal age groups of porphyroblasts are demonstrated with distinctly oriented inclusion‐trails. Inclusion‐trail curvature axes or “FIA” (Foliation...

Early draft of article with the same title published in October 2022

Please ignore this preprint and go to the published article instead (Aerden et al. 2022, Tectonics).

Please ignore this item and go to the published article instead (Aerden et al. 2022, Tectonics).

Early un-reviewed manuscript. Please ignore and go to the published article instead (Aerden et al. 2022, Tectonics). I have been unable to definitely remove this item from my profile. It keeps coming back. Probably because the ms. was originally uploaded to The Earth and Space Science Open Archive (ESSOAr) where it cannot be removed either.

The variety of temporal and structural constraints on the Alpine tectonometamorphic signature of the metamorphic core of the Betic‐Rif orogen (Alboran Domain) has supported a long‐lasting debate regarding the Alpine tectonic and geodynamic evolution of the Western Mediterranean region. Uncertainty still exists on the timing and tectonic significanc...

The structural and thermal relaxation overprint associated with the Neogene Alboran rifting have obscured the early Alpine tectono‐metamorphic evolution of the Alboran Domain, representing the metamorphic core of the Betic‐Rif orogen of the western Mediterranean region. This study focuses on the Beni Mzala unit, forming the lower and deeper structu...

A detailed mineralogical and textural study of two pyroxenites from the Beni Bousera massif, a garnet clinopyroxenite (GP) and a garnet clinopyroxenite containing graphite pseudomorphs after diamond (GGP), indicates a strong metamorphic overprint associated with the massif exhumation. In both pyroxenites, the primary assemblage [Cpx(I) + Gt(I) ± Op...

The garnet websterites and garnet clinopyroxenites from the Beni Bousera peridotite massif contain varying amount of amphibole ± plogophite. The presence of amphibole in both pyroxenites indicates that post-formation metasomatism has affected these pyroxenites. Textural observations, associated with major and trace element compositions of minerals...

Over 30 graphite aggregates that represent pseudomorphs after diamond were manually extracted from a garnet pyroxenite layer in the Beni Bousera peridotite massif, northern Morocco. The inclusions present in the aggregates were characterized by combining scanning electron microscopy, micro-Raman spectroscopy and cathodoluminescence. Large composite...

The Beni Bousera peridotite massif (Internal Rif , Morocco) is formed in a major part of Spinel-bearing lherzolite rimed by a layer of garnet-bearing peridotite which is in direct contact with HP-HT granulite metamorphic rocks (16Kbar, 860°C). A shearing contact between these two formations shows the presence of metamorphic ultramafic intercalation...

Microstructural mapping of whole thin sections cut from two samples of micaschist containing cm-scale folds plus garnet porphyroblasts has provided new insight in the relationships between folding, shearing and foliation development. The garnets exhibit coherent inclusion-trail patterns that place important constraints on the kinematic development...

The Beni Bousera peridotite massif (Internal Rif , Morocco) is formed in a major part of Spinel-bearing lherzolite rimed by a layer 100m thick of garnet-bearing peridotite which is in direct contact with HP-HT granulite metamorphic rocks (16Kbar, 860°C). According to detailed recent study, this shearing contact between these two formations shows th...

The Betic-Rif orogen forms the western termination of the Alpine orogenic system in the Mediterranean region. The precise timing, structural evolution, and distribution of high-grade metamorphic units (Alpine versus pre-Alpine) in the inner zones of the orogen (Alboran Domain) remain controversial issues. In this paper we report occurrence of disti...

The building Betic-Rif orogen at the western end of the Mediterranean is still widely debated. We present new tectonic, metamorphic and geochronological data from the Rif together with a synthesis of available data in the whole Betic-Rif orogen, in order to precise its tectonic evolution and the geodynamics of western Mediterranean. The internal zo...

Detailed microstructural mapping of thin section-scale folds in a garnet bearing micaschist sample from the RIF Mountains (Morocco), including analysis of inclusion trails in 62 small garnets, reveals interesting details about the folding mechanism. A number of classic fold mechanisms capable of producing axial-plane cleavage are reviewed and shown...

In the Rif (northern Morocco) and the Western Betics (southern Spain), the Alboran Domain forms a complex stack of metamorphic nappes including mantle peridotites (Beni Bousera and Ronda). We present in this paper new temperature data obtained in the Alboran Domain based on Raman spectroscopy of carbonaceous material (RSCM thermometry). In the lowe...

REE mineralogy was characterized at the micrometer scale (using scanning electron microscopy) in the four tectono-metamorphic units of the Beni Mzala window, Sebtide Complex, Internal Rif, Morocco, which sample a HP-LT metamorphic gradient from subgreenschist to blueschist/eclogite facies. These tectonic units are composed of garnet-free metapelite...

The internal = northern zones of the Maghrebide belt includes allochthonous massifs that define, together with those from the Betics, Sicily and Calabria, a disrupted ‘Alkapeca’ terrane. In the Rif transect, taking advantage of new thermobarometric and geochronologic studies, we recognize a metamorphic complex with a mostly non-Alpine upper plate (...

The Betico-Rifan Cordilleras represent the western termination of the Alpine Mediterranean orogen. The internal zone of this orogen is the Alboran Domain which consists in a complex stacking of metamorphic nappes including, locally, mantle-derived bodies: the Ronda and Beni Bousera peridotites. In order to assess the tectono-metamorphic evolution o...

Integrated petrological and structural investigations of eclogites from the eclogite zone of the Voltri Massif (Ligurian Alps) have been used to reconstruct a complete Alpine P–T deformation path from burial by subduction to subsequent exhumation. The early metamorphic evolution of the eclogites has been unravelled by correlating garnet zonation tr...

In the Alboran domain, two crustal-thickening late-orogenic extension cycles are superposed. The importance of the late Alpine thinning of the Alpujarride-Sebtide crustal section on top of the Beni Bousera peridotites is discussed here in metamorphic petrological terms. The Alpine metamorphism operated first under a HP–LT gradient, and reached the...

Textural relations between REE-minerals have been studied (by SEM, EMP) in HP-LT metapelites of the Federico unit (Rif, Morocco) as well as in metapelites from Far Western Nepal lesser himalayas. In the Rif samples, the main REE-bearing minerals are monazite, REEPO_4, allanite (10 wt.% REE_2O_3) and synchisite, CaREE(CO_3)_2F. Phase relations betwe...

The metapelitic series of the Filali unit and the Beni Bousera peridotite Massif represent the lowermost metamorphic complexes in the inner part of the Rif chain (Northern Morocco). The Filali unit is composed from base to top by : granulites, gneisses and micaschists overlying the Beni Bousera massif. This unit forms a dome structure over the ultr...

Optically homogeneous pseudomorphs occur in high-pressure metapelites from the Alpine Rif chain, Morocco, along with talc and kyanite. Further characterization using optical microscopy, electron microprobe, single-crystal X-ray diffraction, and HRTEM reveals a complex metamorphic replacement sequence of a previous high-pressure metamorphic mineral,...

Kyanite-bearing basic granulites occur in the kinzigite envelope ot the Beni Bousera peridotite massif (main Sebtide nappe, Rif, Morocco). Their major and trace elements chemistry support an origin from an Al-rich tholeiitic melt. The primary mineral assemblage consists of pyrope-rich garnet (Pyr = 37-60%), jadeite-rich pyroxene (Cpx I with Jd = 20...

Cookeite, LiAl4[AlSi3O10](OH)8 is reported for the first time from Permo-Triassic metapelites of the Sebtides and Alpujarrides nappes in the Rif and Betic mountains. Cookeite occurs in low-pressure, low-temperature as well as high-pressure, low-temperature metamorphic terranes. In the Rif chain, it occurs in the upper (Tizgarine) and lower (Beni Mz...

In the Eastern Rif Belt of northern Morocco the Beni Malek serpentinised peridotite massif is included in a low-grade metasedimentary tectonic pile, which was thrust southward onto the Atlas foreland, and which belongs to the external zones of the Maghrebides belt. We describe serpentinite clasts within calcareous deposits that are transgressive on...

In the Eastern Rif Belt of northern Morocco the Beni Malek serpentinised peridotite massif is included in a low-grade metasedimentary tectonic pile, which was thrust southward onto the Atlas foreland, and which belongs to the external zones of the Maghrebides belt. We describe serpentinite clasts within calcareous deposits that are transgressive on...

Within the Paleozoic Rehamna massif, Morocco, the region lying to the north of the Ras-el-Abiod granite lends itself to a remote sensing study of 'transparency' phenomena in a metamorphic cover that may reveal a granitic body, i. e. the identification, by remote sensing, of modification in enclosing formations caused by granite intrusions. In the c...

A l'intérieur du massif paléozoïque des Rehamna (Maroc), la région située au nord du granite de Ras-el-Abiod se prête à une étude, par la télédétection spatiale, des phénomènes de << transparence » d'une couverture métamorphique révélant un corps granitique. En effet, des granites hercyniens y développent un métamorphisme de contact et une activité...