42 documents found, page 1 of 5
Insights into rare earth elements and other critical raw materials from Castelo...
Salgueiro, Rute; Silva, Teresa; Martín-Méndez, I.; de Oliveira, Daniel Pipa Soares; Batista, Maria Joao; Inverno, CarlosABSTRACT: Actual and future demands for critical raw materials and strategic raw materials (CRM/SRM) justify the global search for their potential sources and the exploration approaches to reach them. This study discloses the characterization of rare earth elements (REE) and other CRM-bearing alluvial heavy minerals samples sourced from the late- to post-tectonic Variscan Castelo Branco Massif (Portugal). It al...
Thermoelectric Properties of Tetrahedrites Produced from Mixtures of Natural an...
Santos, Beatriz; Esperto, Luís; Figueira Vasques, Isabel; Mascarenhas, João; Lopes, E.B.; Salgueiro, Rute; Silva, Teresa; Correia, Jose B.ABSTRACT: Thermoelectric materials have considerable potential in the mitigation of the global energy crisis, through their ability to convert heat into electricity. This study aims to valorize natural resources, and potentially reduce production costs, by incorporating tetrahedrite-tennantite (td) ores from the Portuguese Iberian Pyrite Belt into synthetic samples. The ore samples were collected in a mine wast...
Áreas potenciais de Portugal para recursos minerais do domínio público
Carvalho, Jorge; Filipe, Augusto; Lisboa, Jose; Xavier Matos, João Manuel; Batista, Maria Joao; Salgueiro, Rute; de Oliveira, Daniel Pipa SoaresRESUMO: O ordenamento do território é decisivo no processo de garantir o acesso aos recursos minerais. Durante os trabalhos para identificar as ações necessárias para a preparação da Estratégia Nacional para os Recursos Geológicos foi produzido um mapa de áreas potenciais em recursos minerais de Portugal. Constitui um ponto de partida para a implementação de uma metodologia vocacionada para a delimitação de áre...
Use of mining wastes for high-tech thermoelectric applications : The case of ST...
Morais, Igor; de Oliveira, Daniel Pipa Soares; Silva, Teresa; Albardeiro, Luís; Salgueiro, Rute; Neves, FilipeABSTRACT: Europe aims to become the first climate neutral continent by 2050, which means rapidly implementing a green transition to which the European Union (EU) is strongly committed through the European Green Deal. This green transition leverages unprecedented pressure on the intensive use of mineral resources. In this context the START project “Sustainable Energy Harvesting Systems Based on Innovative Mine W...
Levelling geochemical datasets as a tool to overcome boundary features in data ...
Batista, Maria Joao; de Oliveira, Daniel Pipa Soares; Salgueiro, Rute; Inverno, CarlosABSTRACT: The existence of a large number of chemical analyses resulting from decades of geochemical exploration campaigns, yields huge numbers of analytical results produced with different analytical methods, sampling protocols and sampling means. Therefore, it is necessary to level these analytical results to make them comparable and thus take advantage of the potential of geochemical information from contigu...
Levelling geochemical datasets as a tool to overcome boundary features in data ...
Batista, Maria Joao; de Oliveira, Daniel Pipa Soares; Salgueiro, Rute; Inverno, CarlosABSTRACT: The existence of a large number of chemical analyses resulting from decades of geochemical exploration campaigns, yields huge numbers of analytical results produced with different analytical methods, sampling protocols and sampling means. Therefore, it is necessary to level these analytical results to make them comparable and thus take advantage of the potential of geochemical information from contigu...
Levelling geochemical datasets as a tool to overcome boundary features in data ...
Batista, Maria Joao; de Oliveira, Daniel Pipa Soares; Salgueiro, RuteRESUMO: A existência de um elevado número de análises químicas produzidas durante as campanhas de prospeção geoquímica ao longo de décadas, deu origem a um elevado número de resultados analíticos produzidos com diferentes métodos analíticos, protocolos de amostragem e meios amostrais. Assim sendo, é necessário fazer o nivelamento destes resultados analíticos no sentido de os tornar comparáveis e, assim, aprovei...
Alluvial Sn and W minerals mapping for mineral resources exploration and resear...
Salgueiro, Rute; Grácio, Nuno; Gaspar, Miguel; de Oliveira, Daniel Pipa SoaresSUMÁRIO: Com base em amostras aluvionares em arquivo no LNEG, foi possível conceber mapas de concentração de grãos de cassiterite, volframite e scheelite, para a região mineira de Segura (Castelo Branco) enquadrada na Faixa metalogenética estanho-tungstanífera de Góis-Segura. O padrão de distribuição da concentração de grãos destes minerais de minério de Sn e W, materializa-se em halos concêntricos distintos, e...
Time-space evolution of Iberian Pyrite Belt igneous activity: Volcanic and plut...
Albardeiro, Luís; Morais, Igor; Matos, João Xavier; Solá, A. Rita; Salgueiro, Rute; Pereira, Zélia; Mendes, Márcia; Batista, Maria JoaoABSTRACT: The volcanism in the Iberian Pyrite Belt migrated from the present day west/southwest to the east/northeast during Devonian/Carboniferous times. Evidence is here discussed based in U-Pb zircon ages of felsic volcanic and plutonic rocks, bounded by enclosed sediments and their biostratigraphic ages, together with hosted massive sulphides deposits and associated plutonic counterparts.Volcano-Sedimentary...
Áreas potenciais de Portugal para recursos minerais do domínio público
Carvalho, Jorge; Filipe, Augusto; Gonçalves, Pedro; Lisboa, Jose; Matos, João Xavier; Batista, Maria Joao; Salgueiro, RuteSUMMARY: Land-use planning is decisive for granting access to mineral resources. During the work to identify the actions to be taken for preparing the National Strategy for Geological Resources, a map of mineral potential areas for Portugal was produced. It provides the starting point scenario needed for the implementation of a methodology aimed at the delineation of mineral safeguarding areas.