Manuel Pinto de Abreu

• Universidade NOVA de Lisboa

The most recent submarine eruption observed offshore the Azores archipelago occurred between 1998 and 2001 along the submarine Serreta ridge (SSR), ~ 4–5 nautical miles WNW of Terceira Island. This submarine eruption delivered abundant basaltic lava balloons floating at the sea surface and significantly changed the bathymetry around the eruption ar...

Efetua-se a caraterização geoquímica e mineralógica dose sedimentos recolhidos com um core de gravidade em dois locais: crista da ilha Terceira e monte submarino Great Meteor (cruzeiro EMEPC G3/2007). Os dois testemunhos verticais de sedimentos são descritos tendo em atenção a granulometria das partículas, o conteúdo em carbono orgânico e inorgânic...

We present new He isotopic data from subaerial and submarine samples collected along the Terceira Rift (Azores Plateau) in order to constrain the sources involved in the Azores magmatism in the unique geodynamic context of the Azores triple junction. Lower than MORB 4He/3He isotopic ratios were determined on olivines from the Terceira Island and th...

A Margem Sul Portuguesa Profunda (MSPP) define-se neste trabalho como um conjunto de domínios morfotectónicos limitados superiormente por um rebordo de erosão situado geralmente a profundidades superiores a cerca de 1000 m abaixo do nível do mar, que se desvanece progressivamente para leste, na direcção do estreito de Gibraltar. Os processos que mo...

1. Introdução As margens continentais passivas marcam a transição entre os continentes e os oceanos, constituindo a cicatriz de uma fronteira de placas gerada durante o processo de ruptura da litosfera continental e neoformação de litosfera oceânica. Na geodinâmica actual, estas margens representam grande parte dos ambientes de tectónica distensiva...

Storage of CO<sub align="right"> 2 </sub> as hydrates in sub-seabed sediments has been indicated as an alternative solution for the geological storage of CO<sub align="right"> 2 </sub>, suitable for offshore areas where large ocean depths and low temperatures exist at short distance from the shore. This paper presents the works conducted to identif...

This study provides data concerning the hydrography and water chemistry of the Atlantic region between 29-38° N and 27-31° W, and establishes background values for dissolved Cu, Cd, Pb and As. Three water masses were identified: the Eastern North Atlantic Central Water (ENACW), the Mediterranean Water (MW) and the North Atlantic Deep Water (NADW)....

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...

Continental margins are commonly interested by mass movements caused by gravitational instability, usually triggered by sediment erosion and seismic shaking. Such events can involve considerable masses of sediments and rocks, that can reach high velocities due to the slope steepness and provoke huge tsunamis, even if their source is located in deep...

Twelve new 40 Ar/ 39 Ar ages, major and trace element geochemical data from several lava sequences at São Jorge Island, Azores, are presented. These data improve the temporal constrains on the volcanic and geochemical evolution of the island. Overall, in the Azores context, São Jorge was constructed by fault-controlled fissural volcanism, dominated...

Landslides along continental margins represent a significant source for tsunami generation, due to the oversteepened slopes where they are usually located, enhancing mass velocity and then their tsunamigenic potential. These phenomena represent a threat due to their usual closeness to the coast, involving short travel times, and also because they a...

relation between quakes and some Quaternary erup-tions in Kamchatka region (Pevzner, 2009). However, more studying need here. There are many questions, of course. 2. Surely, gas monitoring is a very optimistic. 3. Using of animals prognosis. 4. Complex analysis is an important including analysis of the very volcanic prod-ucts, inclusions, glasses e...

Analysis of a multibeam echosounder hydrographic survey performed in the Southern Azores Platform under the scope of the Portuguese Continental Shelf Project has revealed a large scale bathymetric structure nicknamed ``Fried Egg'' due to its well defined morphology. Laying at about 2km depth, this structure consists of a roughly circular 6km wide d...

The West Madeira Abyssal Plain is located in the eastern North Atlantic off Madeira Islands, forming part of the Canary Basin and reaching a mean water depth of 5300 m. This region is also located within Africa plate at about 500 km southwards from the Açores-Gibraltar plate boundary, and for that reason lacks seismic activity. Although this region...

EMEPC@team (1) EMEPC – Estrutura de Missão para a Extensão da Plataforma Continental, Portugal, luisapr@emepc.gov.pt (2) Departamento de Geociências da Universidade dos Açores, Portugal (3) OVGA – Observatório Vulcanológico e Geotérmico dos Açores, Portugal São Jorge Island (38º46' – 38º33'N and 28º20' – 27º45'W) is a part of the Azores Plateau, a...

In the scope of the Portuguese Continental Shelf Extension Program, 1600 km of 2D MCS reflection lines were acquired over the Iberia Abyssal Plain and the southern edge of the Galicia Bank. The survey ties in with other academic and industry surveys. It comprised four E-W lines, crossing from continental to oceanic crust along the Zone of Exhumed C...

Portugal has now the capability to explore the deep ocean with a 6000 meter rated ROV. The ROV, named LUSO, was acquired by the Portuguese Task Group for the Extension of the Continental Shelf (EMEPC). LUSO is a work class Bathyssaurus XL, developed by ARGUS Remote Systems AS and has entered in operation in September 2008. Its main application will...

Dredging operations were performed south of the Azores Archipelago, during LEG 2 of cruise EMEPC/Açores/G3/2007, and lava samples (basalts s.l.) were recovered on the Great Meteor, Hyeres and Plato seamounts (Lourenço et al., 2008). The resulting new isotopic data (Sr, Nd, Pb) is reported and compared with the existing isotopic signature of the Azo...