29 documents found, page 1 of 3
From source to surface: clues from garnet-bearing Carboniferous silicic volcani...
Cravinho, André; Rosa, Diogo; Relvas, Jorge M.R.S.; Solá, A. Rita; Pereira, Inês; Paquette, J. L.; Borba, M. L.; Tassinari, Colombo C. G.; Chew, DavidABSTRACT: This work investigates the relationships between partial melting, melt extraction, pluton growth and silicic volcanism in garnet-bearing felsic volcanic rocks that were extruded in the Iberian Pyrite Belt, at ca. 345 Ma. The garnets are of peritectic origin, displaying textural and chemical features of disequilibrium crystallization during partial melting reactions involving biotite at high temperatur...
From source to surface: clues from garnet-bearing Carboniferous silicic volcani...
Cravinho, André; Rosa, Diogo; Relvas, Jorge M.R.S.; Solá, A. Rita; Pereira, Inês; Paquette, J. L.; Borba, M. L.; Tassinari, Colombo C. G.; Chew, DavidABSTRACT: This work investigates the relationships between partial melting, melt extraction, pluton growth and silicic volcanism in garnet-bearing felsic volcanic rocks that were extruded in the Iberian Pyrite Belt, at ca. 345 Ma. The garnets are of peritectic origin, displaying textural and chemical features of disequilibrium crystallization during partial melting reactions involving biotite at high temperatur...
Biostratigraphic and structural research of the Guedelhinha-Lançadoiras- Algaré...
Pereira, Zélia; Matos, João Xavier; Mendes, Márcia; Solá, A. Rita; Albardeiro, Luís; Morais, Igor; Araújo, Vítor; Pacheco, Nelson; Oliveira, José TomásABSTRACT: Based on drill hole sampling and sedimentary rock dating by palynology, the present research focuses on the palynostratigraphic events established in the key geological section of Guedelhinha-Lancadoiras-A lgare located in the Portuguese Neves-Corvo mine region, Iberian Pyrite Belt. The age data allow detailing the lithostratigraphic sequence and further understanding the complex structural setting, r...
Biostratigraphic and structural research of the Guedelhinha-Lançadoiras- Algaré...
Pereira, Zélia; Matos, João Xavier; Mendes, Márcia; Solá, A. Rita; Morais, Igor; Albardeiro, Luís; Araújo, Vítor; Pacheco, Nelson; Oliveira, José TomásSUMÁRIO: A presente investigação mostra os principais eventos palinoestratigráficos identificados na seção geológica de Guedelhinha-Lançadoiras-Algaré, localizada na região da mina de Neves-Corvo, Faixa Piritosa Ibérica. A idade estabelecida permitiu detalhar a sequência litoestratigráfica e compreender a grande complexidade estrutural, representando um importante contributo para o conhecimento geológico deste ...
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...
Biostratigraphic and structural research in the Guedelhinha–Lançadoiras–Algaré ...
Pereira, Zélia; Matos, João Xavier; Mendes, Márcia; Solá, A. Rita; Albardeiro, Luís; Araújo, Vítor; Pacheco, Nelson; Oliveira, José TomásABSTRACT: Based on drill hole sampling and sedimentary rock dating by palynology, the present research focuses on the palynostratigraphic events established in the key geological section of Guedelhinha–Lançadoiras–Algaré located in the Portuguese Neves–Corvo mine region, Iberian Pyrite Belt. The age data allow detailing the lithostratigraphic sequence and further understanding the complex structural setting, re...
The state of the art of Phyllite-Quartzite Group Lower and Upper sequences, Mid...
Matos, João Xavier; Pereira, Zélia; Mendes, Márcia; Albardeiro, Luís; Diez-Montes, Alejandro; Araújo, Vítor; Oliveira, José TomásRESUMO: O Grupo Filito-Quartzítico (GFQ) é considerado o substrato siliciclástico da Faixa Piritosa Ibérica (FPI), aflorando nas antiformas de Pomarão-Puebla de Guzmán, Valverde, Neves-Corvo– Rosário, Lousal–Caveira, São Francisco da Serra e Cercal. No setor norte da FPI o GFQ está presente em estruturas alóctones em São Domingos, Mértola, Alcaria Ruiva, São Barão, Roxo e Serrinha. A idade palinológica do GFQ, ...
3D Constrained Gravity Inversion and TEM, Seismic Reflection and Drill-Hole Ana...
Marques, Fábio; Dias, Pedro; Carvalho, João; Represas, Patricia; Spicer, Bill; Araújo, Vítor; Matos, João Xavier; Morais, Igor; Albardeiro, LuísABSTRACT: Located in the Iberian pyrite belt, the Neves-Corvo mine is a world-class massive sulfide deposit and the largest operating mine in Portugal with underground mining down to 1000 m depth focused on massive and stockwork Cu, Zn, Pb rich ores. Gravimetric data have had a leading role in the discovery of the seven known deposits, together with time-domain electromagnetic (TEM) ground data. In this work, w...
3D reflection seismic imaging of volcanogenic massive sulphides at Neves-Corvo,...
Donoso, George; MALEHMIR, Alireza; Carvalho, João; Araújo, VítorABSTRACT: Three-dimensional reflection seismic data from the Neves-Corvo area, southern Portugal, were reprocessed with the main objective of improving the seismic signature of the Lombador and Semblana volcanogenic massive sulphide deposits. The sensitivity for choosing adequate parameters for targeted imaging, even during the pre-processing stage, such as common-depth point binning size, was studied in detail...
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...