El paisaje del área fuente cenozoica, evolución e implicaciones; correlación con el registro sedimentario de las cuencas

Erosion surfaces are the main geomorphological features of the Hesperian Massif. However, three other physiographic elements define the present state of the landscape. Such are big mountain blocks with polygonal borders building at great scale mountain chains, some more modest ridges following hercynian structural trends, and finally the strong incision of the fluvial net. On the other hand, paleoalterations and associated sediments are the only available ways for relief correlation and interpretation. It consists of a triple relationship giving good results when the regional stratigraphy is well known. Tectonic massifs, differential relief sand incisions are originated by geotectonic alpine disturbances during the Tertiary. The three events are consecutive in time with overlapping lapses which the prior and following element: differencial reliefs as a mesozoic heritage occur first, afterwards morphostructural blocks responding directly to the alpine deformation, and finally the fluvial incision as a delayed answer to the preceding morphostructural changes. The relationship relief sedimentation confirms widely this idea, since an association exists between a siderolitic Cretaceous-lower Paleogene and the differential reliefs, between arkoses from the upper Paleogene and the tectonic morphostructural blocks and between the Neogene Series Ocres and the terraces.

Invertebrados y micropaleontología en la evolución de la Cuenca del Guadalquivir (España) y la Plataforma del Algarve (Portugal)

Based upon the depositional sequences in the Guadalquivir basin and the bio-events defined (foraminifera and nanoplancton) we present the synthesis of the paleontological results in correlation with the Neogene of Algarve (Portugal). We present the most representative outcrops for micropaleonlologic results, as well as paleoenvironmental correlations between Algarve and the Guadalquivir basin.

Estudio preliminar de los sistemas fluviales cenozoicos de la Cuenca del Guadiana entre Mérida y Badajoz (España)

A sequência estratigráfica cenozóica da bacia do Guadiana entre Mérida e Badajoz está representada por depósitos de leque aluvial e fluviais. Neste trabalho apresenta-se urna primeira descrição de duas das unidades de preenchimento da bacia. A primeira corresponde a sedimentos de idade miocénica que se encaixaram nos depósitos de Ieque aluvial, que os antecedem, desenvolvendo um sistema fluvial com urna direcção principal E-W, caracterizado pela presença de barras e canais arenosos associados a níveis edáficos, com fraco desenvolvimento da planície de inundação. A segunda unidade, de idade pliocénica, representa a instalação de uma nova rede de drenagem que se sobrepõe e erode os sedimentos miocénicos. A direcção principal entre Mérida e Badajoz continua a ser E-W, para inflectir para o S em Badajoz. As facies pliocénlcas são essencialmente conglomeráticas e arenosas, correspondendo a canais móveis e barras formadas em consequência de processos de migração e encaixe da rede fluvial. Ambos os sistemas fluviais representam parte da evolução do preenchimento da bacia do Guadiana desde o Miocénico até ao Plio-Quaternário, sendo as principais diferenças entre ambos interpretadas como devidas a modificações tectónicas pre-quaternárias na região.

EL PAISAJE Y LA TRANSICIÓN ENERGÉTICA: COMPARANDO EL SURGIMIENTO DE PAISAJES DE ENERGÍA EÓLICA EN FRANCIA, ALEMANIA Y PORTUGAL

Due to the global acceptance of the reality of global warming, ever more countries are in the process of implementing alternative energies such as wind power. In this article, we focus on the transformation of space as a consequence of these newly established alternative energy policies. Landscapes are the level at which political visions and policy decisions endorse (or not) their very materiality. We analyze the deployment of wind power in three European countries, France, Germany and Portugal through the lens of ethnographic landscape studies. We argue that the successful implementation of low carbon futures is highly dependent on the respective national cultures of administration as well as on local practices, initiatives and perceptions of space at the local level. In each of the countries under scrutiny, we analyze the way in which wind power and landscape issues are framed, we point at potential tensions and explore how these are overcome (or not) at the local level so as to give way for the emergence of (new) wind power landscapes. We compare the role played by landscape cultures, institutions or practices in the development and resolution of tensions over the deployment of wind energy.