82 documents found, page 1 of 9
Laboratory experiments and modelling of the geochemical interaction of a gabbro...
Berrezueta, Edgar; Moita, Patricia; Pedro, Jorge; Abdoulghafour, Halidi; Mirão, José; Beltrame, Massimo; Barrulas, Pedro; Araújo, AlexandreThe potential for mineral carbonation of carbon dioxide (CO2) in a plutonic mafic rock is addressed in this work through a set of laboratory experiments on a gabbro-anorthosite sample from the Torrão - Odivelas Massif (Portugal). The experiment was conducted in two stages under pressure (8 MPa) and temperature (313.15 K) conditions similar to those expected around a CO2 injection well. Stage-I simulated dissolu...
Avaliação do potencial dos maciços gabróicos do Alentejo para a carbonatação mi...
Pedro, Jorge; Carneiro, Júlio; Moita, Patricia; Berrezueta, Edgar; Araújo, Alexandre; Marques, Fábio; Pinho, Catarina; Caeiro, HelenaThe InCarbon project assessed the potential of gabbroic rocks for CO2 storage in alentejo. Lab carbonation experiments were carried out on gabbroic rocks from the Sines and Odivelas massifs. After gabbroic samples exposure to supercritical CO2-rich brine inside an autoclave, for 90 days, the XRD analysis reveals the presence of dolomite on sample surface, whereas the chemical mapping, by SEMEDS, suggest a spati...
Locais de interesse geomorfológico dos domínios setentrionais da Zona de Ossa M...
Pereira, Diamantino; Moreira, Noel; Moura, Pedro; Martins, António; Araújo, AlexandreO património natural tem vindo a ganhar cada vez maior importância na ótica do ordenamento do território e do turismo de natureza. Este trabalho caracteriza oito sítios de interesse geomorfológico dos domínios setentrionais da Zona Ossa Morena (Alentejo), visando expor o seu valor científico, educativo, cénico e turístico, bem como contribuir para a valorização do território e a sua geoconservação. Seis sítios ...
Cartografia Geológica aplicada: Estudo de Impacte Ambiental da Quinta do Carmo ...
Araújo, Alexandre; Moreira, Noel; Batista, TeresaNo âmbito do estudo de impacte ambiental realizado por uma equipa multidisciplinar para a implementação de um projeto de eco-turismo e de uma barragem na Quinta do Carmo (Glória, Estremoz), realizou-se um estudo geológico detalhado. Coube à “equipa de geologia” a revisão da cartografia geológica, a caracterização geomorfológica e a identificação de potenciais recursos geológicos. Dado que a cartografia geológic...
Strain partitioning in transpression; a major feature in the evolution of the I...
Dias, Rui; Araújo, Alexandre; Couto, Helena; Cruz, Cláudia; Ferreira, Joana; Gonçalves, Ana Marta; Lima, Alexandre; Lopes, Luís; Moreira, NoelAs the wavy pattern of fold belts is a common feature, since its recognition, the transpressive regimes were expected to be a pervasive mechanism on their evolution. Nevertheless, even in regions where oblique shortening is inferred, typical structures of transpression (e.g. transected cleavage and en echelon folds, shear or veins) are often absent. Instead, what is frequently observed is the juxtaposition of n...
Local Seismic Tomography Reveals the Crustal Structure Beneath Arraiolos (Centr...
Hamak, Ines; Wachilala, Piedade; Borges, José; Koulakov, Ivan; Araújo, Alexandre; Bezzeghoud, MouradAn ML 4.9 earthquake occurred in Arraiolos, central Alentejo, on the 15 January 2018. As the mainshock was recorded as the highest magnitude in the region, a thorough investigation of the cause of this seismicity was carried out. In this study, local seismic tomography was conducted for the first time to demonstrate the importance of a uniform spatial distribution of earthquakes for obtaining accurate crustal i...
Terraces of the Guadiana River between the Pulo do Lobo water fall and Pomarão ...
Martins, Antonio; Moreira, Noel; Araújo, Alexandre; Melo, RaquelThe terraces of the Guadiana River were mapped in the stretch between Pulo do Lobo and the Pomarão village. In this work we used the river terraces to estimate the uplift rate and to understand the main controls driving the river's incision throughout the late Pleistocene and Holocene. Four terrace levels were identified upstream of Pulo do Lobo and five terraces in the downstream reach. Uplift rates ranging be...
Locais de interesse geomorfológico dos domínios setentrionais da zona de Ossa M...
Pereira, D. I.; Moreira, Noel; Moura, Pedro; Martins, António; Araújo, AlexandreThis work characterizes eight geomorphological sites of the northern domains of the Ossa Morena Zone, aiming to expose their scientific, educational, scenic and touristic value, as well as to support the enhancement of the territory and its geoconservation. Six panoramic sites allow to approach and interpret the features of the Estremoz and Évora plateaus and the landforms that stand out from them, due to the j...
Aplicação da análise Fry a ocorrências de Cu (-Fe) da Faixa Metalogénica Sousel...
Moreira, Noel; Dias, Rui; Roseiro, José; Nogueira, Pedro; Maia, Miguel; Araújo, AlexandreThe application of spatial point distribution analysis methods is widely used to find hidden orientations and internal organization of data. The application of these methods to mineralizations is recurrent since the beginning of the 20th century, namely applying the Fry classical method. This method is applied to the Cu (-Fe) occurrences of the Sousel-Barrancos Metallogenic Belt, and the first results are prese...
Cartografia estrutural da região de Viana do Alentejo – Alvito; organização tec...
Moreira, Noel; Araújo, Alexandre; Pedro, Jorge; Roseiro, JoséThe structural features of the SW border of the Ossa-Morena Zone is highly controlled by subduction-collision processes related with last stages of the Variscan Cycle. Structural mapping of Viana do Alentejo – Alvito region allows the characterization of several tectono-stratigraphic units with discrepant tectono-metamorphic evolution, including relative autochthonous and alochthonous units, all of them detache...