36 documents found, page 1 of 4
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...
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...
Chemical composition of submarine massive sulphides in the Lucky Strike hydroth...
Ferreira, Pedro Tavares; Inverno, Carlos; Silva, Teresa; Schiellerup, Henrik; González, JavierSUMÁRIO: No segmento Lucky Strike, localizado na Crista Média da região dos Açores, existe um dos maiores campos submarinos hidrotermais activos do nosso planeta. Para além da existência de dezenas de chaminés hidrotermais expelindo fluidos a elevadas temperaturas (~325 ºC), uma área significativa com cerca de 1 km2 é constituída por um substrato rochoso formado por placas hidrotermais e sulfuretos maciços poli...
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...
Chemical composition of submarine massive sulphides in the Lucky Strike hydroth...
Ferreira, Pedro Tavares; Inverno, Carlos; Silva, Teresa; Schiellerup, Henrik; González, JavierSUMÁRIO: No segmento Lucky Strike, localizado na Crista Média da região dos Açores, existe um dos maiores campos submarinos hidrotermais activos do nosso planeta. Para além da existência de dezenas de chaminés hidrotermais expelindo fluidos a elevadas temperaturas (~325 ºC), uma área significativa com cerca de 1 km2 é constituída por um substrato rochoso formado por placas hidrotermais e sulfuretos maciços poli...
Programa de cartografia transfronteiriça do LNEG-IGME na Zona Sul Portuguesa na...
Matos, João Xavier; Díez-Montes, Alejandro; Dias, Ruben Pereira; Pereira, Zélia; Machado, Susana; Solá, A. Rita; Carmona, J.J. HuertaSUMMARY: The South Portuguese Zone (SPZ) 1/200 000 and 1/400 000 scale maps and stratigraphic program in SW Iberia is presented by a LNEG-IGME consortium and funded by GEO_FPI/Interreg-POCTEP. The 1/200 000 mapped area corresponds to the border area and is based on previous work (Folha 8 and Sevilla-Puebla de Guzmán maps). The 1/400 000 map covered a larger area, from Lisbon to Seville. The following domains of...
Geophysical investigation of the down-dip extension of the Lombador massive sul...
Dias, Pedro; Thunehed, Hans; Represas, Patricia; Carvalho, João; Inverno, Carlos; Spicer, Bill; Ramalho, Elsa; Donoso, George; Araújo, VítorABSTRACT: The 150 Mt Lombador massive sulphide deposit is one of the seven known deposits of the Neves-Corvo mine. The deposit dips approximately 30º–35º to the NE and is open down dip, with current exploitation reaching down at 1 km depth. To investigate the possible downwards continuation of the deposit, a 1D constrained inversion of time-domain electromagnetic (TEM) ground loop data was conducted, followed b...
Geology of the recently discovered massive and stockwork sulphide mineralizatio...
Pereira, Zélia; Matos, João Xavier; Solá, A. Rita; Batista, Maria Joao; Salgueiro, Rute; Rosa, Carlos J. P.; Albardeiro, Luis; Mendes, MárciaABSTRACT: The recently discovered massive and stockwork sulphide mineralization of Semblana-Rosa Magra and Monte Branco, situated ESE of the Neves–Corvo volcanogenic massive sulphide (VMS) deposit in the Iberian Pyrite Belt (IPB) is presented. Geological setting and tectonic model is discussed based on proxies such as palynostratigraphy and U–Pb zircon geochronology. The mineralization is found within the IPB V...
Geology of the recently discovered massive and stockwork sulphide mineralizatio...
Pereira, Zélia; Matos, João Xavier; Solá, A. Rita; Batista, Maria Joao; Salgueiro, Rute; Rosa, Carlos; Albardeiro, Luis; Mendes, Márcia; Morais, IgorAbstract The recently discovered massive and stockwork sulphide mineralization of Semblana-Rosa Magra and Monte Branco, situated ESE of the Neves–Corvo volcanogenic massive sulphide (VMS) deposit in the Iberian Pyrite Belt (IPB) is presented. Geological setting and tectonic model is discussed based on proxies such as palynostratigraphy and U–Pb zircon geochronology. The mineralization is found within the IPB Vo...