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Formation et évolution du bassin de Boucheville, implication sur l'évolution tectonique, métamorphique et sédimentaire des bassins sédimentaires mésozoïques du Nord-Est des Pyrénées

Abstract : Extensive mechanisms induce interactions between tectonic, sedimentary and metamorphic processes, especially when they are associated with a high temperature metamorphism. Therefore, the study of these mechanisms requires a threefold approach in order to identify these processes and understand the interactions between them. Such study is hardened because of the depth of these mechanisms and the lack of direct observation. To overcome such difficulties we chose to study a paleo passive margin now visible thanks to many outcrops. For this thesis, we focused on the North Pyrenean Zone (NPZ) which happens to be a Mesozoic passive margin which outcroped during Eocene / Oligocene (40-20 Ma) Pyrenean compression. This margin recorded HT / LP metamorphism which makes it a good analogue for our study. We focused on the eastern part of the NPZ, in the Agly Massif area where are located the Saint-Paul-de-Fenouillet basin, the bas-Agly basin and the Boucheville basin all of which recorded different intensity of metamorphism. The Boucheville basin is the worst documented but recorded the most metamorphism which is why we decided to study it in detail. We conducted a structural, stratigraphic and sedimentary analysis of these three basins in order to better understand their geometry and geological history. We combined this study with metamorphism analyzes mainly provided by Raman spectrometry on maximum temperatures recorded during Cretaceous extension. Finally, we synthetised these results to produce restored cross sections of our study area. Those cross sections allowed us to suggest a model for Mesozoic sedimentary basin formation in the eastern part of the NPZ. Considering first order analysis, on a N-S cross section, the area made of a shoal,the future Agly Massif. It is bordered on its northern side by a north verging detachment fault and on its southern by a south verging detachment fault. On both sides of this shoal are sedimentary basins much thicker towards these detachment faults. However, we must consider the system is not cylindrical. The Agly Massif acts as a transfer zone between two highly subsident basins, the Bas-Agly basin at its north-east and the Boucheville basin at its south-west.
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Submitted on : Tuesday, April 19, 2016 - 9:59:03 AM
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Roman Chelalou. Formation et évolution du bassin de Boucheville, implication sur l'évolution tectonique, métamorphique et sédimentaire des bassins sédimentaires mésozoïques du Nord-Est des Pyrénées . Tectonique. Université Rennes 1, 2015. Français. ⟨tel-01303038⟩

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