Evolution néotectonique de la partie méridionale du bassin de Guercif (Maroc oriental)

Ce mémoire précise la stratigraphie et analyse l'évolution tectonique de la partie méridionale du bassin néogène à quaternaire du Guercif ( Maroc oriental )pas de résum

Kinematic models of deformation at the front of the Alps: new data from map-view restoration

International audienceMap-view restoration of the frontal part of the French Alps was done in order to test two hypotheses about the propagation of deformation. We discussed two models of the ‘rooting' of the Jura-Molasse basal detachment either along basement thrusts beneath the External Basement Massifs (EBM-rooting model) or along basal thrusts of the Subalpine Chains above the External Basement Massifs (SAC-rooting model). The different sequences of deformation are described for the two models with their kinematics and geochronological constraints. The geochronological data available on the uplift timing of the External Basement Massif are then discussed. Due to their range of uncertainty, geochronological data on the exhumation of the External Basement Massifs are not decisive to discriminate between the two models. Using either the maximum or the minimum age in the range of their uncertainty allows fitting the timing constraints of both models. Interpretation of map-view restoration reveals a weakness of the EBM-rooting model linked to the fact that a sharp virgation is predicted between the two main cross sections. This does not discard this model as such virgation may be linked to paleostratigraphic or tectonic effects but this must be taken into account when using this model. Structural data are also discussed as field geology on the mechanism of uplifting of the external basement massif or geophysical data as deep seismic lines shot in the frame of the ECORS and NRP20 research programs. Such data favor one or the other model without discarding one of them. We conclude that, with the available data, both models seem possible and that the less popular one (SAC-rooting model) shows the more coherent restoration field, the reason why we favor it at the present time

Sur l'évolution néotectonique du Maroc septentrional

In Morocco, the Rif and its southern and eastern borders has been submitted, after the miocene paroxysmal compression, to neotectonic deformations from the Tortonian till the present time. We distinguish successively : - one period principally extensive (Tortonian -Pliocene) corresponding to the individualisation and the working of the "post-nappe" basins ; - one compressive period towards the Pliocene-Quaternary boundary with, sometimes, pluri-kilometrical folded structures ; - one probably distensive quaternary period. During this time, there is maintenance or individualisation of subsidence areas and concomitant surrection of relieves.Au Maroc, le Rif et ses bordures méridionales et orientales ont été soumis, après le serrage paroxysmal miocène, à des déformations néotectoniques s'étageant depuis le Tortonien jusqu'à l'actuel. On distingue ainsi : - une période à dominante distensive (Tortonien à Pliocène) correspondant à l'individualisation et au fonctionnement des bassins "post-nappes" ; - une période compressive vers la limite Pliocène-Quaternaire responsable, parfois, de structures plicatives pluri-kilométri-ques ; - une période probablement distensive quaternaire au cours de laquelle il y a maintien ou individualisation d'aires de subsidence et surrection concomitante de reliefs.Rampnoux Jean Paul, Angelier Jean, Colletta Bernard, Fudral Serge, Guillemin Michel, Pierre Guillaume. Sur l'évolution néotectonique du Maroc septentrional. In: Géologie Méditerranéenne. Tome 6, numéro 4, 1979. Tectonique. pp. 439-464

Single mothers and their children after divorce: A study of those who "make it"

The present study was conducted in Toronto, and explored the post- separation functioning of single mothers and their children. Fifty-seven women who have been separated for an average of 6.8 years were interviewed. There were 96 children involved. Although the majority of the mothers perceived the separation process as "negative" or "very negative" and the contribution of their ex-partners to the upbringing of their children as less than desirable, a larger number claimed that their children's school performance, relations with peers and relations with themselves were not negatively altered due to the marital break-down. The only negative aspect noted was the children's relationship with their fathers. No differences between male and female children were observed. Overall, findings indicate that separation and divorce, contrary to popular beliefs, need not be a traumatic event and theoretical perspectives which predict negative effects should be revised in order to reflect the changing social realities