GCG - Resumos em livros de actas
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Browsing GCG - Resumos em livros de actas by Author "Albardeiro, Luís"
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- Biostratigraphic and structural research of the Guedelhinha-Lançadoiras- Algaré sector of the Neves-Corvo mine region, Iberian Pyrite BeltPublication . 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 sector. A sequência de eventos reconhecida possibilitou a reconstrução da sedimentação e dos paleoambientes durante o Devónico e Carbónico, confirmando a existência de vários hiatos identificados na região da mina de Neves-Corvo. Salienta-se a importância dos sedimentos de idade Estruniano superior na Faixa Piritosa Ibérica (Biozona de Miosporos LN; Formação de Neves), confirmando a contemporaneidade entre o vulcanismo félsico, hidrotermalismo e precipitação de sulfuretos metálicos e a sedimentação anóxica de xistos negros.
- Calcretos da região de Elvas : Estudo preliminarPublication . Soares, S.; Dias, Ruben Pereira; Ressurreição, Ricardo; Morais, Igor; Albardeiro, Luís; Gonçalves, Pedro; Solá, A. Rita; Castro-Pina, M.SUMMARY: The construction of a new railway in NE Alentejo crossing the Ossa Morena Zona allowed new detailed studies focused on the geological units and the structure of the area. In the Elvas region, the Miocene is represented by a coarse conglomerate covered by sandy mudstones. The conglomerate is coarser near the Messejana fault, where it is also tilted. Its deposition is probably related to the Alpine reactivation of the fault. The sediments and the basement rocks are strongly affected by Miocene calcretization. A chemical characterization of calcrete along vertical profiles was done with portable x-ray fluorescence equipment. The preliminary results show a decrease in CaO content upwards and an increase in SiO2.
- Contributo do acompanhamento das grandes obras de engenharia para a cartografia geológica : Caso de estudo do Corredor Internacional SulPublication . Morais, Igor; Albardeiro, Luís; Gonçalves, Pedro; Soares, S.; Solá, A. Rita; Dias, Ruben Pereira; Ressurreição, Ricardo; Castro-Pina, M.; Serra, B.; Pereira, Zélia; Mendes, MárciaSUMMARY: The follow up of new railway works, which will be part of the International South Corridor (Corredor Internacional Sul”, allowing the privileged access to new Ossa-Morena Zone outcrops, contributes to refine detailed geological mapping, as part of LNEG's mission. Along the different sections of the railway line, systematic geological sampling was carried out for petrographic, geochronological and paleontological studies. In addition, photographic record and three-dimensional modeling of the main slopes were performed using a drone. This methodology allows the construction of an information repository that can be consulted long after the works have been concluded and the outcrops become inaccessible. Besides the accuracy improvement of the geological contacts of the Ossa-Morena Zone rocks, the preliminary results confirmed the extent of Miocene debris flow sedimentation (conglomerates) and subsequent calcretization, and has identified new mineral occurrences.
- Geodiversidade no troço médio do rio Guadiana, argumentos para um futuro Geoparque no território de Mértola, Serpa, Moura e BarrancosPublication . Matos, João Xavier; Dias, Ruben Pereira; Pereira, Zélia; Ressurreição, Ricardo; Soares, S.; Mendes, Márcia; Albardeiro, Luís; Gonçalves, Pedro; Santos, Sara; Piçarra, José ManuelSUMMARY: The region of Mértola, Serpa, Moura and Barrancos, located in the middle section of the Guadiana River presents a distribution of geosites of great scientific value, constituting the argument to a future Geopark. The studied territory includes the Ossa-Morena (OMZ) and South Portuguese (SPZ) geological sequences, the tectonic boundary between these two variscan domains, the geomorphology conditioned by Alpine tectonics, the Guadiana, Ardila and Chança rivers incision and differential erosion of quartzites, dolomites and marbles. Significant geological heritage is also present in the SPZ Iberian Pyrite Belt VMS and OMZ copper deposits. The Guadiana territory presents a typical landscape and exceptional geosites in a natural habitat (e.g. Pulo do Lobo waterfalls). In total, 50 geosites were considered in 6 regions: Barrancos-Ardila, Ficalho, Serpa-Pias-Moura, Alcaria, Guadiana and São Domingos. The future project of Geopark will be planned by the four municipalities considering geoconservation plans and regional sustainable policy.
- Programa de cartografia transfronteiriça do LNEG-IGME na Zona Sul Portuguesa nas escalas 1/200 000 e 1/400 000. Um contributo para a estratigrafia do SW IbéricoPublication . Matos, João Xavier; Díez-Montes, Alejandro; Dias, Ruben Pereira; Pereira, Zélia; Machado, Susana; Solá, A. Rita; Carmona, J.J. Huerta; Ressurreição, Ricardo; Albardeiro, Luís; Mendes, Márcia; Morais, Igor; González-Clavijo, Emilio J.; Gonçalves, Pedro; Santos, Sara; de Oliveira, Daniel Pipa Soares; Salgueiro, Rute; Henriques, S.B.A.; Oliveira, José Tomás; Fernandes, Paulo; Inverno, Carlos; Lopez, M. T.SUMMARY: 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 SPZ were considered: Pulo do Lobo (early Frasnian-late Famennian), Iberian Pyrite Belt (late Famennian-late Visean) and Baixo Alentejo Flysch Group (late Visean-late Moscovian). The maps include the Mesozoic Algarve basin and the Cenozoic Guadalquivir/Algarve basins. Field surveys were done using standard stratigraphic and GIS database methodologies. Palynological studies of Paleozoic metasedimentary rocks and U/Pb zircon geochronology of plutonic and volcanic rocks were essential to refine and update the Paleozoic stratigraphy. The new data allowed new knowledge and the validation of the geological models.