14 documents found, page 1 of 2
High-Resolution Marine Magnetic Mapping of the Portuguese Nearshore: Unraveling...
Neres, Marta; Terrinha, Pedro; Brito, Pedro; Rosa, Marcos; Noiva, João; Magalhães, Vítor; Silva, Mariana; Batista, Luis; Teixeira, ManuelThe SW Portuguese margin has been intensively studied, particularly for rifting, tectonic inversion and tectonic reactivation of the Atlantic passive margin. In this work we bring new data on the continental shelf, usually not acquired by the heavier geophysical methods (e.g. airborne or low resolution deep seismic-magnetic surveys). These new data allow casting a clear light bridging between the geological str...
The role of the seismically slow Central-East Atlantic anomaly in the genesis o...
Civiero, Chiara; Custodio, Susana; Neres, Marta; Schlaphorst, David; Mata, João; Silveira, GraçaThe Canary and Madeira provinces in the Central-East Atlantic Ocean are characterized by an irregular spatio-temporal distribution of volcanism along the hotspot tracks, and several alternative scenarios have been suggested to explain it. Here, we combine results from seismic tomography, shear-wave splitting and gravity along with plate reconstruction constraints to investigate the mantle structure and dynamics...
The Role of the Seismically Slow Central‐East Atlantic Anomaly in the Genesis o...
Civiero, Chiara; Custódio, Susana; Neres, Marta; Schlaphorst, David; Mata, João; Silveira, GraçaThe Canary and Madeira provinces in the Central-East Atlantic Ocean are characterized by an irregular spatio-temporal distribution of volcanism along the hotspot tracks, and several alternative scenarios have been suggested to explain it. Here, we combine results from seismic tomography, shear-wave splitting and gravity along with plate reconstruction constraints to investigate the mantle structure and dynamics...
Multi-scale and multi-disciplinary investigation of the southwest Portuguese Co...
Terrinha, Pedro; Ribeiro, Carlos; Noiva, João; Rosa, Marcos; Brito, Pedro; Magalhães, Vítor; Neres, Marta; Nogueira, Pedro; Velez, SandraThe MINEPLAT project (Assessment of the mineral resources potential in the continental shelf of Alentejo and of the environmental conditions caused by the tectonic uplift in the PlioceneQuaternary) allowed acquisition of 1700 km of ultra- high resolution seismic profiles, and full coverage of multibeam bathymetry and acoustic backscatter of 1450 km2 and 1940km of magnetic data of the Alentejo continental shelf,...
Nature and origin of gas trapped in sediments in the Tagus River ebb-delta, off...
Ribeiro, Carlos; Terrinha, Pedro; Rosa, Marcos; Neres, Marta; Noiva, João; Brito, Pedro; Magalhães, VítorThe Tagus River ebb-delta is located near an important city center off Lisbon, Portugal. The Tagus delta hosts various kilometer scale landslides, the most important of which has been mapped and described with a presumable age of ~11 ky and 10 km in length, 4 km wide and 20 m of maximum thickness. An equivalent area of gas trapped in the sediments has also been reported (Terrinha et al., 2019). The TAGUSGAS pro...
Integrated thematic geological mapping of the Atlantic Margin of Iberia.
Terrinha, Pedro; Medialdea, Teresa; Batista, Luís; Somoza, Luis; Magalhães, Vítor; González, Francisco Javier; Noiva, João; Lobato, Ana; Rosa, MarcosThis paper synthesizes the geology of the Atlantic Margin off the coast of Iberia and surrounding Abyssal Plains using published thematic mapping freely downloadable from EMODNET-Geology portal at different scales. Selected information was chosen in order to highlight mineral occurrences and natural hazards overlaid on geological and morphological maps. Altogether, this information is published and interpreted ...
Exploring the Alentejo continental shelf for minerals and PlioQuaternary enviro...
Noiva, João; Ribeiro, Carlos; Terrinha, Pedro; Neres, Marta; Brito, PedroThis study presents the preliminary results of MINEPLAT survey, organised by Universidade de Évora in partnership with Instituto Português do Mar e da Atmosfera). It is based on the analysis of geophysical data collected during that survey: ultra-high resolution seismic data, multibeam data (both bathymetry and backscatter data) and magnetic data. The survey took place on the north part of Alentejo continental ...
Cataloguing Quaternary paleo-coastlines in West and Southwest Portugal. Economi...
Ribeiro, Carlos; Terrinha, Pedro; Brito, Pedro; Noiva, João; Rosa, Marcos; Batista, Luis; Neres, Marta; Magalhães, VitorA catalogue of paleo-coast lines in Southwest and South Portugal is presented based on direct field observation and on recent multibeam and backscatter bathymetric surveys. Above sea level, coastline classification was based on field observation of i) wave cut platforms directly associated with ii) notches and/or marine sand deposits with shell clasts, iii) speleothems interbedded with sand deposits and iv) bea...
The Alpine Orogeny in the West and Southwest Iberia Margins.
Terrinha, Pedro; Ramos, Adrià; Neres, Marta; Valadares, Vasco; Duarte, João; Martinez-Loriente, Sara; Silva, Sónia; Mata, João; Kullberg, José CarlosThe Alpine orogeny is well recorded onshore and offshore by tectonic inversion of the Mesozoic rift basins. Large scale linear seamounts (more than 250 km long and with up to 5 km of uplift) involving oceanic and continental lithosphere were carried on top of thrusts, such as the Gorringe seamount and the Estremadura Spur in the SouthWest and West Iberia Margin, respectively. The SouthWest Iberia Margin also re...
Rifting of the Southwest and West Iberia Continental Margins
Terrinha, Pedro; Kullberg, José Carlos; Neres, Marta; Alves, Tiago; Ramos, Adrià; Ribeiro, Carlos; Mata, João; Pinheiro, Luís; Afilhado, AlexandraThe West and SouthWest Margins of Iberia started their formation as intra-continental rifts during initial break up of Pangea in Triassic times. The tectono-stratigraphic record of the Algarve, Alentejo and Lusitanian basins and their offshore prolongation documents the syn-rift, post-rift and passive margin phases of the rifting process as well as three magmatic cycles of tholeiite to alkaline affinities. Alth...