Encontrados 16 documentos, a visualizar página 1 de 2
Mineralogical attenuation for metallic remediation in a passive system for mine...
Valente, Teresa Maria Fernandes; Antunes, M.; Braga, M. A. Sequeira; Prudêncio, M. I.; Marques, R.; Pamplona, J.Passive systems with constructed wetlands have been consistently used to treat mine water from abandoned mines. Long-term and cost-effective remediation is a crucial expectation for these water treatment facilities. To achieve that, a complex chain of physical, chemical, biological, and mineralogical mechanisms for pollutants removal must be designed to simulate natural attenuation processes. This paper aims to...
Susceptibility-Weighted Imaging - Aplicações em Neuropediatria
Conceição, C; Patrício, M; Caçador, N; Pamplona, Jde imagem em RM, caracterizada pela sua alta resolução espacial e grande sensibilidade a diferenças de susceptibilidade magnética dos tecidos, acentuando as propriedades paramagnéticas de produtos como a desoxihemoglobina, hemossiderina, ferro e cálcio e sendo particularmente útil na avaliação das estruturas venosas. Objectivos: O objectivo deste trabalho é fazer uma breve revisão das aplicações clínicas da seq...
Kinematic interpretation of shearband boudins : new parameters and ratios usefu...
Pamplona, J.; Rodrigues, Benedito C.Shearband boudins (asymmetric boudins showing slip along the inter-boudin surface, which is synthetic with respect to the bulk shear sense) are ubiquitous and well-exposed in HT simple shear zones. The present work aims to extend the methodology of analysis of shearband boudins developed by Goscombe and Passchier (2003). Such shearband boudins represent complex objects that require an adequate methodology for u...
Mineralogical and geochemical study of clay and calcite veins in a shear zone r...
Lima, Manuela Fonte; Pamplona, J.; Braga, M. A. SequeiraIn the Terras de Bouro area, in Northwest Portugal, the role of water-rock interaction, either by the mineralization of the sulphur spring, or by the nature of the granite secondary minerals, was studied as a complement to exploration for mineral water. This approach is justified by the peculiar mineral paragenesis found, which is very different from those of the regional weathering products. Calcite and montmo...
Microstructural analysis of shearband boudin - preliminary results
Rodrigues, Benedito C.; Peternell, Mark; Moura, António; Pamplona, J.The internal structure of a shearband boudin resulting from an original igneous, hydrothermal or metamorphic segregation tabular rigid body is a subject of scientific interest. It allows understanding the deformation mechanisms acting on homogeneous quartz aggregate activated during simple shear progressive deformation. This communication is focused on the characterization of two main structural aspects: (i) th...
Application of shearband boudins analysis to understand ductile shear zones
Sousa, João P.; Rodrigues, Benedito C.; Pamplona, J.The methodology used for the kinematic analysis of H-T ductile shear zones based on geometric analysis of boudins, proved to be a easy application tool. The boudin analysis begans with the measurement of the Lb (boudin axis) orientation, as a fundamental element of the kinematic analysis in simple shear – Lb proved always to be perpendicular to a local displacement plane (Sx) that is defined as the plane that c...
Sobre as possíveis fontes das pedras do Mosteiro de Salzedas (Tarouca - Portugal)
Pamplona, J.; Alves, C. A. SimõesO Mosteiro e Igreja de Salzedas situam-se sobre o Granito de Penodono-Salzedas-Alvite, que neste local se apresenta muito meteorizado e fracturado. A utilização de elementos petrográficos permitiu discriminar diferentes tipos de granitos nestes monumentos e, com informações topográficas e históricas, propor possíveis relações com pedreiras próximas.
Properties of the ochre-precipitates formed during passive treatment of AMD for...
Valente, Teresa Maria Fernandes; Antunes, M.; Pamplona, J.; Grande, J. A.; De la Torre, M. L.; Santisteban, M.; Cruzado, M.This work presents the properties of the waste sludge formed by neutralization in a passive system, constructed to treat AMD from an abandoned Au-mine (Jales plant, Portugal). These wastes, here designated as ochre-precipitates, pose some management problems since they are quantitatively important and interfere with the biological treatment, affecting the global performance of the treatment plant. The geochemic...
Geoscout
Almeida, A. M.; Pamplona, J.A crusta terrestre é a camada mais externa, menos espessa e, também, a menos densa das que constituem a Terra. As tensões geradas nos níveis superiores da estrutura terrestre podem gerar episódios sísmicos de consequências, por vezes, dramáticas. A prevenção destes fenómenos (caóticos) tem-se revelado falível, visto não existirem sinais de aviso com tempo suficiente para a evacuação das regiões onde ocorrem, ou...
Fold boudins : what is that?
Pamplona, J.; Rodrigues, Benedito C.The hypothesis proposed in this work is related with the genesis and evolution, in HT simple shear zones, of a new conceptual structure designed by fold boudin. The field evidences, achieved in the scope of a methodology to analyze the kinematics of shearband boudins (Pamplona & Rodrigues, 2011), are the basis to show how folds evolute until reach a shearband boudin final state. The critical mass factor (Mc) is...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||