[1-1-20], Angus [Alexander] capitaine de l'équipe d'Écosse [de rugby posant avant le match France-Écosse au Parc des princes] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 57442

Musée de l'histoire du costume, France, 1540 [32 rue Beaujon, Hôtel de Madrazo, Paris, 8e arrondissement, ouvert au public le 24 janvier 1920] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 57827

16/2/20, l'équipe de France [de rugby affrontant le Pays de Galles] à l'entrainement à Colombes : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 58014

Paul Cambon [ambassadeur de France à Londres] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 58120

Equipe du Pays de Galles [de rugby affrontant la France], Colombes, 17/2/20 : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 58042

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.