Ediacaran Obduction of a Fore-Arc Ophiolite in SW Iberia: A Turning Point in the Evolving Geodynamic Setting of Peri- Gondwana

The Calzadilla Ophiolite is an ensemble of mafic and ultramafic rocks that represents the transition between lower crust and upper mantle of a Cadomian (peri-Gondwanan) fore arc. Mapping and structural analysis of the ophiolite demonstrates that it was obducted in latest Ediacaran times, because the Ediacaran-Early Cambrian sedimentary series (Malcocinado Formation) discordantly covers it. The ophiolite and emplacement-related structures are affected by Variscan deformation (Devonian-Carboniferous), which includes SW verging overturned folds (D1) and thrusts (D2), upright folds (D3), extensional faults (D4), and later faults (D5). These phases of deformation are explained in the context of Variscan tectonics as the result of the progressive collision between Gondwana and Laurussia. Qualitative unstraining of Variscan deformation reveals the primary geometry of Ediacaran-Cambrian structures and uncovers the generation of east verging thrusts as responsible for the primary obduction of the Calzadilla Ophiolite. Restoration of planar and linear structures associated with this event indicates an Ediacaran, east directed obduction of the ophiolite, that is, emplacement of the Cadomian fore arc onto inner sections of the northern margin of Gondwana. According to regional data, the obduction separates two extension-dominated stages in the tectonic evolution of the African margin of northern Gondwana preserved in southern Europe. Preobduction extension brought about the onset and widening of fore-arc and back-arc basins in the external part of the continent, while postobduction extension facilitated the formation of extensional migmatitic domes, an oceanward migration of back-arc spreading centers across peri-Gondwana, and the eventual opening of a major basin such as the Rheic Ocean

Derivation of a multilayer approach to model suspended sediment transport: application to hyperpycnal and hypopycnal plumes

We propose a multi-layer approach to simulate hyperpycnal and hypopycnal plumes in flows with free surface. The model allows to compute the vertical profile of the horizontal and the vertical components of the velocity of the fluid flow. The model can describe as well the vertical profile of the sediment concentration and the velocity components of each one of the sediment species that form the turbidity current. To do so, it takes into account the settling velocity of the particles and their interaction with the fluid. This allows to better describe the phenomena than a single layer approach. It is in better agreement with the physics of the problem and gives promising results. The numerical simulation is carried out by rewriting the multi-layer approach in a compact formulation, which corresponds to a system with non-conservative products, and using path-conservative numerical scheme. Numerical results are presented in order to show the potential of the model

Family and Internet

El desarrollo de la Humanidad nos dibuja un aumento en las capacidades de comunicación del ser humano. Esta situación viene de la mano, fundamentalmente, del gran avance que los nuevos medios de comunicación, caso de Internet, están experimentando. Según las autoras, esta situación reclama un entendimiento entre la familia y este medio (Internet), exige el establecimiento de unas líneas de comunicación que ayude a los miembros de la familia en su crecimiento y socializaciónThe progress of Humanity shows an increase in the communication capacities of the human being. This situation is bound to the great advance that the new media, such as Internet, are experiencing and it claims for a new understanding between the family and the new media. The authors think that the establisment of some communication lines which would help the families in their growth and socialization are completely necessary

Los videojuegos y su capacidad didáctico-formativa

Hoy las máquinas ocupan un lugar privilegiado en nuestra vida. Podemos destacar la presencia de los videojuegos dentro de la dinámica familiar y escolar. Los videojuegos pueden ser considerados como otra forma de enseñar, si esta se desarrolla a través de una correcta supervisión. Esta situación demanda la intervención directa de la familia y de los docentes como referentes socializadores de los niños de hoy, hombres del mañanaToday the machines occupy a privileged place in our life. We can emphasize the presence of the video games within the familiar and scholastic dynamics. The video games can be considered as other form of teaching, if this is developed through a correct supervision. This demand situation the direct intervention of the family and of the educational as referring of the children of today, men of the tomorrow

The Space of Countably Simple Bounded Functions with Values in a DF-Space

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