[Installation du cénotaphe sous l'Arc de Triomphe dans le cadre de la fête de la Victoire] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 54825

[Installation du cénotaphe sous l'Arc de triomphe à l'occasion de la fête de la Victoire] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 54822

[Installation du cénotaphe sous l'Arc de triomphe à l'occasion de la fête de la Victoire] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 54819

[Installation du cénotaphe sous l'Arc de triomphe à l'occasion de la fête de la Victoire] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 54814

Textural, chemical, and isotopic effects of late-magmatic carbonatitic fluids in the carbonatite-syenite Tamazeght complex, High Atlas Mountains, Morocco

Carbonatites of the Eocene Tamazeght complex, High Atlas Mountains, Morocco, consist of calciocarbonatites (alvikite and sovite dykes) and magnesiocarbonatites (diatreme breccias and dykes rocks). These are associated with ultramafic, shonkinitic, gabbroic to monzonitic and various foid syenitic silicate units. Stable and radiogenic isotope compositions for carbonatites and silicate rocks indicate that they share a common source in the mantle, although for some carbonatitic samples contamination with sedimentary rocks seems important. The observed isotopic heterogeneity is mainly attributed to source characteristics, fractional crystallization (accompanied by various degrees of assimilation), and late- to post-magmatic fluid-rock interaction. During the late fluid-rock interaction, Sr, Mn, and possibly also Fe were mobilized and redistributed to form secondary carbonate minerals in carbonatites. These fluids also penetrated into the adjacent syenitic rocks, causing enrichment in the same elements.

[Préparatifs en vue du 14 juillet 1919, construction du cénotaphe sous l'arc de triomphe de l'Etoile] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 54853

[Préparatifs en vue du 14 juillet 1919, construction du cénotaphe sous l'arc de triomphe de l'Etoile] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 54851

[Arc de triomphe de l'Etoile, le cénotaphe, foule importante, 13 juillet 1919] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 54888

[Le cénotaphe sous l'Arc de triomphe de l'Etoile, le 13 juillet 1919] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 54882

13-7-19, le cénotaphe, arc de triomphe [place de l'Etoile, foule nombreuse] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 54866

13-7-19, Arc de triomphe de l'Etoile [édification du cénotaphe, foule importante] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 54859

Alpine tectonic evolution of a Jurassic subduction-accretionary complex: Deformation, kinematics and 40Ar/39Ar age constraints on the Mesozoic low-grade schists of the Circum-Rhodope Belt in the eastern Rhodope-Thrace region, Bulgaria-Greece

Deformation of the Circum-Rhodope Belt Mesozoic (Middle Triassic to earliest Lower Cretaceous) low-grade schists underneath an arc-related ophiolitic magmatic suite and associated sedimentary successions in the eastern Rhodope-Thrace region occurred as a two-episode tectonic process: (i) Late Jurassic deformation of arc to margin units resulting from the eastern Rhodope-Evros arc-Rhodope terrane continental margin collision and accretion to that margin, and (ii) Middle Eocene deformation related to the Tertiary crustal extension and final collision resulting in the closure of the Vardar ocean south of the Rhodope terrane. The first deformational event D-1 is expressed by Late Jurassic NW-N vergent fold generations and the main and subsidiary planar-linear structures. Although overprinting, these structural elements depict uniform bulk north-directed thrust kinematics and are geometrically compatible with the increments of progressive deformation that develops in same greenschist-facies metamorphic grade. It followed the Early-Middle Jurassic magmatic evolution of the eastern Rhodope-Evros arc established on the upper plate of the southward subducting Maliac-Meliata oceanic lithosphere that established the Vardar Ocean in a supra-subduction back-arc setting. This first event resulted in the thrust-related tectonic emplacement of the Mesozoic schists in a supra-crustal level onto the Rhodope continental margin. This Late Jurassic-Early Cretaceous tectonic event related to N-vergent Balkan orogeny is well-constrained by geochronological data and traced at a regional-scale within distinct units of the Carpatho-Balkan Belt. Following subduction reversal towards the north whereby the Vardar Ocean was subducted beneath the Rhodope margin by latest Cretaceous times, the low-grade schists aquired a new position in the upper plate, and hence, the Mesozoic schists are lacking the Cretaceous S-directed tectono-metamorphic episode whose effects are widespread in the underlying high-grade basement. The subduction of the remnant Vardar Ocean located behind the colliding arc since the middle Cretaceous was responsible for its ultimate closure, Early Tertiary collision with the Pelagonian block and extension in the region caused the extensional collapse related to the second deformational event D-2. This extensional episode was experienced passively by the Mesozoic schists located in the hanging wall of the extensional detachments in Eocene times. It resulted in NE-SW oriented open folds representing corrugation antiforms of the extensional detachment surfaces, brittle faulting and burial history beneath thick Eocene sediments as indicated by 42.1-39.7 Ma Ar-40/Ar-39 mica plateau ages obtained in the study. The results provide structural constraints for the involvement components of Jurassic paleo-subduction zone in a Late Jurassic arc-continental margin collisional history that contributed to accretion-related crustal growth of the Rhodope terrane. (C) 2011 Elsevier Ltd. All rights reserved.

Jeanne d'Arc : sa vie, son procès, sa mort / Narjo. [Jeanne Darc, poésie / signée Paul Thouzery]

Comprend : Jeanne Darc, poésie