3D evolution of a retro-foreland basin : the Aquitaine Basin, France

Abstract : Foreland basins develop in front of orogens by flexure of the lithosphere. When they initiate over a crust that has been affected by a previous tectonic event, structural and thermal inheritance have a fundamental role in their evolution and different sources may contribute to basin subsidence. The present work analyzes the impact of inheritance from a rifting event on a foreland basin, which develops while thermal reequilibration has not been achieved at the time of loading. The Aquitaine Basin is the Pyrenean retro-foreland basin that developed from Campanian to Miocene. The Pyrenean orogenesis follows an Aptian-Cenomanian rifting during which the continental crust is thinned and sub-continental mantle exhumed. The orogenesis starts only 10 Myr after the end of rifting. The effects of crustal inheritance due to rifting on the evolution of the basin are studied by analyzing crustal structures, flexural behavior of the European plate, and foreland succession distribution. The subsidence evolution of the basin is studied by the 1D backstripping technique using borehole data. Finally, inversion mechanisms of the European margin are studied by cross-section construction and restoration at crustal scale. This study helps to define the role of rift inheritance on the initiation and the evolution of a retro-foreland basin, as well as the relative role of subsidence sources and their variations in space and time. The present work also shows the strong relationship between the retro-foreland basin's history and both mechanism and the history and mechanisms of inversion of a hyper-extended margin
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Theses
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http://docnum.univ-lorraine.fr/ulprive/DDOC_T_2017_0227_ANGRAND.pdf
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https://hal.univ-lorraine.fr/tel-01906295
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Submitted on : Friday, October 26, 2018 - 4:10:18 PM
Last modification on : Saturday, October 27, 2018 - 1:17:37 AM

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  • HAL Id : tel-01906295, version 1

Citation

Paul Angrand. 3D evolution of a retro-foreland basin : the Aquitaine Basin, France. Earth Sciences. Université de Lorraine, 2017. English. ⟨NNT : 2017LORR0227⟩. ⟨tel-01906295⟩

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