PE/PA clay ternary blends : characterization and viscoelastic properties of the interphase

Eurofillers, Germany Dresden, 21-25 august, 2011

PE/PA clay ternary blends : characterization and viscoelastic properties of the interphase

Eurofillers, Germany Dresden, 21-25 august, 2011

Structural and rheological properties of different polyamide/polyethylene blends filled with clay nanoparticles: A comparative study

International audienc

Comparative study of interphase viscoelastic properties in polyethylene/polyamide blends compatibilized with clay nanoparticles or with a graft copolymer

International audienc

Relationships between carbonate fault rocks and fluid flow regime during propagation of the Neogene extensional faults of the Penedes basin (Catalan Coastal Ranges, NE Spain)

Different types of fractures and fault rocks occur within the major normal fault zones bordering the NW of the Neogene Penedes basin (NE Spain). In the southwest part of the basin, the main fault is the Baix Penedes fault that places the Upper Jurassic-Lower Cretaceous dolomicrites of the footwall in contact with the Miocene siliciclastic sediments of the hangingwall. Within the footwall damage zone, different fracture systems and their respective associated breccias and cements have been recognized. Using a combination of structural, petrologic and geochemical analyses, we show that these fracture systems evolved from mainly tectonic to mainly karstic features during the progressive development and upward propagation of the fault. The earlier fractures and associated breccias represent the initial stages of the fault propagation, when the process zone formed around the fault tip was dominated by dilatant fracturing (fractures 1 and dilatant breccias B1). The fluid involved in this early deformation precipitated the dolomite cement Cl, in equilibrium with the host-rock in a closed hydrogeological system. Localization of frictional processes generated cataclasites and ultracataclasites along distinct second-order faults (fractures 2). In these fractures, the dolomite cement C2 precipitated in relation to the incipient opening of the hydrological system to percolating meteoric waters. The later fractures and associated breccias represent the late stages of the fault propagation. These structures (fractures 3, fractures 4 and the dilatant breccias B2) were formed when the extensional deformation reached the surface, resulting in an increasingly open hydrogeological system. At these stages, deposition of the dolomitic sediment DS and precipitation of the calcite cements C3, C4 and C5 show the circulation of freshwaters in a vadose meteoric environment, i.e. in karstic conditions

Modelización de la migración de fluidos y del transporte de calor en cuencas sedimentarías compresivas: aplicación a la cuenca de Ainsa

We present a method of modeling the hydraulic and thermal evolution of sedimentary basins that undergo compressive deformation. A finite-element mesh generatoris used , that is capable of creating bandwidth optimized meshs taking into account geometrical deformations caused by sediment consolidation, lateral movements of thrust sheets and erosion al events. A finite-elements modelis used to solve the equations of fluid flow, sediment consolidation as well as solute- and heat transport. We apply the model of the Southern Pyrenean foreland basin of Ainsa in order to constrain fluid flow evolution during the emplacement of thrust sheets. Furthermore, we compare the data obtained by petrological and geochemical studies in the Ainsa bain host rocks and veins to corroborate the application of this methodPresentamos un método de modelización de la evolución hidráulica y térmica en cuencas sedimentarias sometidas a una deformación compresiva. Para hacer esta modelización hemos utilizado un generador de redes de elementos finitos capaz de crear una red de elementos finitos optimizada. El modelo toma en consideración las deformaciones geométricas causadas por la consolidación de los sedimentos, los movimientos laterales de los mantos cabalgantes y los eventos de erosión. El generador de redes de elementos finitos se utiliza para solucionar las ecuaciones de migración de los fluidos, de la consolidación de los sedimentos y de transporte, tanto de los solutos como del calor. Este modelo es aplicado a la cuenca del antepaís sur-pirenaica de Ainsa (Pirineo Aragonés) con el fin de determinar la evolución de la migración de los fluidos durante el emplazamiento de los cabalgamientos y para identificar el origen de los fluidos, que pueden haber alterado los sedimentos durante el emplazamiento del sistema de cabalgamientos. Además, comparamos los datos obtenidos a partir de estudios petrológicos y geoquímicos en los sedimentos que rellenan la cuenca de Ainsa y en las mineralizaciones de calcita originadas sincrónicamente a la deformación compresiva debido a la circulación de fluidos a fin de verificar la aplicación de este método de modelizació