TARDI VARISCAN DEFORMATION IN THE IBERIAN PENINSULA; A LATE FEATURE IN THE LAURASIA-GONDWANA DEXTRAL COLLISION

The Late Variscan deformation event in Iberia, is characterized by an intraplate deformation regime induced by the oblique collision between Laurentia and Gondwan. This episode in Iberia is characterized by NNE-SSW strike-slip faults, which are considered by the classic works as sinistral strike-slips. However, the absence of Mesozoic formations constraining the age of this sinistral kinematics, led some authors to consider it as the result of Alpine reworking. Structural studies in Almograve and Ponta Ruiva sectors (SW Portugal), not only shows that NNE-SSW faults presents a clear sinistral kinematics and are occasionally associated with E-W dextral shears, but also that this kinematics is related to the late deformation episodes of Variscan Orogeny. In Almograve sector, the late Variscan structures are characterized by NNE-SSW sinistral kink-bands, spatially associated with E-W dextral faults. These structures are contemporaneous and affect the previously deformed Carboniferous units. The Ponta Ruiva Sector constrains the age of deformation because the E-W dextral shears affect the Late Carboniferous (late Moscovian) units, but not the overlying Triassic series. The new exposed data shows that the NNE-SSW and the E-W faults are dynamically associated and results from the same deformation event. The NNE-SSW sinistral faults could be considered as second order dominoes structures related with first order E-W dextral shears, related with Laurasia-Gondwana collision during Late Carboniferous-Permian Times.

Da dominação à cooperação: a paz perpétua e a luta eterna entre nações

O presente ensaio tem por objetivo a construção de uma linha de pensamento sobre as teorias e a realidade das Relações Internacionais baseada na pluralidade de valores e na justaposição de ideias que designam e afetam as relações entre os atores internacionais, assim como, entender os reflexos que estes fatores têm nos desfechos destas interações resultantes em cooperação e conflito. Por meio de uma revisão bibliográfica são visitados alguns pensamentos sobre a formação dos estados nacionais e sobre as interações destes, produzindo conceitos relativos à ordem e ao equilíbrio em uma sociedade internacional, e aos fatores que afetam e são variáveis a existência dos estados. A designação teórica da realidade internacional desprovida de prescrições ou distorções ideológicas edifica neste ensaio valiosas linhas de pensamento, que podem contribuir significativamente para o desenvolvimento de proposições mais fidedignas a realidade do que a anseios específicos no campo das Ciências Políticas e das Relações Internacionais. ABSTRACT: The aim of this study is to construct of a way of thinking about the theories and the reality of International Relations based on the plurality of values and juxtaposition of ideas that mark and affect the relationships between international players. A further objective is understanding the influences of these factors in creating outcomes of cooperation or conflict within international interactions. Various thoughts and reflections on the formation of national states and their interactions have been examined by way of an intensive literature review, thus producing concepts concerning the order and equilibrium of an international society as well as the factors that affect and vary depending on the existence of states. Through the theoretical portrayal of the reality of international relations devoid of ideological prescriptions or distortions this study creates a number of lines of thinking, that could significantly contribute to the development of propositions more true to reality than specific aspirations within the field of Political Science and International Relations.