Albitisation et oxydation des roches granitoïdes en relation avec la paléosurface triasique des Sudètes (SW Pologne)

Abstract : Wide surfaces and huge volumes of granito-gneissic basements of the Hercynian massifs are albitized from North-Africa up to Scandinavia. The supergenic origin of these facies has already been forwarded in the past. The supergenic/endogenic question has to be substantiated beyond doubt before going further in this subject. Demonstrating that the albitized facies are of supergenic origin and bound to the Triassic palaeosurface renews deeply the ideas about the evolution of the Hercynian basements. The recognition of the Triassic palaeosurface on wide basement areas of western Europa will provide a spatio-temporal bench marks to constrain the ablation of these massifs since the Trias. This will be a major contribution to the geodynamic modelling of these areas. This albitization comes with a "carbonation" of the Ca from the plagioclase feldspars. In this manner, albitisation plays a significant rule in the CO2 storage during the Trias, with regard to the giant volume of rocks in consideration. Furthermore, in the backdrop arises the questions of the specificity of this sodium-rich paleoaweathering features, find out their origin, and bound them to the giant sodium chloride accumulation during the Permo-Triassic times… is this the record of a global event ?
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Kouakou Fulgence Eric Yao. Albitisation et oxydation des roches granitoïdes en relation avec la paléosurface triasique des Sudètes (SW Pologne). Sciences de la Terre. Ecole Nationale Supérieure des Mines de Paris; Państwowy Instytut Geologiczny (Pologne), 2013. Français. ⟨NNT : 2013ENMP0069⟩. ⟨pastel-00971314⟩

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