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De la marge Ouest du craton du Yangtze à la bordure Est du plateau Tibétain : évolution géodynamique à partir de l'étude structurale, pétrologique, géochimique et géochronologique de roches magmatiques et métamorphiques

Abstract : The present geometry of the Eastern Tibetan plateau, made of the Songpan Ganze terrane and the Longmen Shan range, is probably due to a rheological contrast between the Yangtze craton to the East, and the Songpan Ganze, which bump into the craton margin in response to the India-Asia collision. We reconstituted the geodynamic evolution of the area from Neoproterozoic times to present to evaluate how the different orogenic cycles influence the thermal, mineralogical and chemical structures observed today. Studies of the crystalline massifs of the western margin of the Yangtze craton and of the San Dao Qiao ophiolite show that during the Neoproterozoïc times, the craton margin was a subduction zone with opening of marginal basin due to mantle plumes. Petrologic and structural studies of the Danba metamorphic complex allow determining that during the Indosinian orogeny (200-180 Ma), exhumation mechanism of the deep structural level of the complex is an extrusion along a ductile thrust. Plutons position relative to sutures zones in the Tibetan plateau lead to a model of double slab roll-back under the Songpan Ganze at the end of the Indosinian orogeny which explain the diversity of the granites. The double slab roll-back and the difference in deformation between the Songpan Ganze and the Yangtze craton lead to a slab tear along the craton margin. The complete delamination of the lithospheric mantle under the Songpan Ganze terrane can explain the present juxtaposition of a thick crust and thin mantle lithosphere against a cratonized one.
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Audrey Billerot. De la marge Ouest du craton du Yangtze à la bordure Est du plateau Tibétain : évolution géodynamique à partir de l'étude structurale, pétrologique, géochimique et géochronologique de roches magmatiques et métamorphiques. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2011. Français. ⟨NNT : 2011NAN10025⟩. ⟨tel-01746164⟩

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