Apport de la paléohydrologie dans la quantification des rôles respectifs du climat et de la tectonique des systèmes fluviatiles méandriformes fossiles : application à des systèmes oligo-miocènes d'Europe occidentale

Abstract : Associated to a sedimentary approach, paleohydrology enables the reconstruction of hydrological parameters from the channel to the drainage area. Although fluvial systems are known to be influenced by allo-and auto-genic processes, their influences were not taken into account in previous paleohydrological works. Therefore, the present study attempts to develop a new method of paleohydrological reconstitution, based on the point-bar height (water depth), only parameters recorded in the sedimentary successions, and constrained by the climate. Thanks to hydrological data of two different climatic realms, original regional equations are developed to express hydrologic parameters using the water depth. These regional equations are validated thanks to the application to two Oligo-Miocene meandering systems, deposited under different climates: the Alpine Foreland Basin (SE France) associated to a subtropical humid realm; and the Loranca Basin (Central Spain) related to subtropical climate with dry seasons. The paleohydrological results are in agreement with mineralogical sources and flow velocity given by the field data. The respective contributions of climate, tectonic and, base level are discussed through the paleohydrological results. Paleo-hydro-climatic reconstructions show the development since the Lower Aquitanian of a climatic gradient from Spain to France. Each studied basin had recorded the cold Mi1 event. Modifications of drainage area and extreme changes in channel sizes are related to tectonic deformation indicating capture and transition of meandering to anabranching systems.
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Stratigraphy. École Nationale Supérieure des Mines de Paris, 2011. French. <NNT : 2011ENMP0008>


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Submitted on : Thursday, March 3, 2011 - 3:48:38 PM
Last modification on : Thursday, May 12, 2011 - 4:51:52 PM

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  • HAL Id : pastel-00570494, version 1

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Anne-Edwige Held. Apport de la paléohydrologie dans la quantification des rôles respectifs du climat et de la tectonique des systèmes fluviatiles méandriformes fossiles : application à des systèmes oligo-miocènes d'Europe occidentale. Stratigraphy. École Nationale Supérieure des Mines de Paris, 2011. French. <NNT : 2011ENMP0008>. <pastel-00570494>

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