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Mantle dynamics and characteristics of the Azores plateau

Situated in the middle of the Atlantic Ocean, the Azores plateau is a region of elevated topography encompassing the triple junction between the Eurasian, Nubian and North American plates. The plateau is crossed by the Mid-Atlantic Ridge, and the Terceira Rift is generally thought of as its northern boundary. The origin of the plateau and of the Terceira Rift is still under debate. This region is associated wit...

A Margem Sul Portuguesa profunda

Margem Oeste Portuguesa

Mantle dynamics and volcanism emplacement in the Azores

The Azores plateau is a triangular shaped topographic feature encompassing the boundary zone where three major tectonic plates (EU, NU and NA) meet. The eastern side of the plateau is delimited by two major tectonic discontinuities: the Mid Atlantic Ridge, and the Terceira Rift, a recently formed ultra-slow-spreading ridge. The origin of the plateau is still under debate. One hypothesis argues that the plateau ...

The Terceira Rift, Azores: a melt inclusion study of submarine lavas

The Azores plateau, a bathymetric high, is seated on an anomalous mantle domain located in the Azores Triple Junction where the American, EUR and AFR lithospheric plates meet. The cause for these anomalies is controversial but many authors consider the presence of an anomalously hot/wet enriched mantle probably supplied by a plume [3]. The origin, size and present location of the plume is under debate but an ar...

O uso de visualizações no tema "Combustíveis, Energia e Ambiente" : um estudo c...

Relatório da prática de ensino supervisionada, Ensino de Física e Química para o 3.º ciclo do Ensino Básico e do Ensino Secundário, Universidade de Lisboa, 2012 ; Com este trabalho pretendeu-se conhecer a reação dos alunos do 12.ºano de escolaridade à implementação de atividades com recurso às visualizações, durante o ensino da subunidade “Combustíveis fósseis: o carvão, o crude e o gás natural”. Para isso, pr...

Enxertos de metal duro em ligas ferrosas

Tese de mestrado. Engenharia dos Materiais. Faculdade de Engenharia. Universidade do Porto. 2006

He and Ne isotopic ratios from the Terceira Rift (Azores): Constraints on the b...

We present He and Ne isotopic data from subaerial and submarine samples collected along the Terceira Rift. Graciosa Island as well as the western end of S. Miguel Island and D. João de Castro Bank display 4He/3He ratios similar to those observed along the MAR segments located to the north of the Azores Triple Junction area. Conversely, samples from the south Hirondelle Basin display a 4He/3He ratio similar to t...

Transformação numa área de serviços TI e implementação de metodologia LEAN

Mestrado em Gestão ; Relativamente à Indústria de Tecnologias de Informação existe actualmente um conjunto de boas práticas e normas de regulação acessíveis e reconhecidas em todo o mundo, que ajudam a definir e montar uma estrutura eficaz para entregar aos clientes os serviços que eles esperam, quando esperam, garantindo segurança da informação, confidencialidade e fiabilidade dos processos implementados. Nes...

He and Ne isotopic ratios along the Terceira Rift: implications for the Azores ...

Noble gas data (He and Ne) on olivine phenocrysts obtained from Azores’ lavas sampled along the Terceira Rift will be presented in this work. The Terceira Rift is considered as one of the slowest spreading system in the world (Vogt & Jung, 2004). Lava samples were collected inland at S. Miguel, Terceira, Graciosa, Pico and Faial Islands as well at sea at D. João de Castro Bank and south Hirondelle basin, the la...