Multi-elemental and isotope geochemistry of metapelites from the Volcano-Sedimentary Complex (Iberian Pyrite Belt, Portugal) : unravelling fingerprints of different sources, sedimentary environments and exhalative-hydrothermal activity

Over the last two decades, promising steps have been made in the development of new greenfield and brownfield exploration methods for massive sulphide ore-forming systems in the Iberian Pyrite Belt (IPB). However, the effects of lateral and vertical facies variations in metasedimentary piles forming the two main lithostratigraphic units that potentially host massive sulfide deposits [the Phyllite-Quartzite Group (PQG) and the Volcanic-Sedimentary Complex (VSC)] on mineral exploration remain unknown. Massive sulphide deposits of the IPB document the progression of ore-forming processes in the SW Iberian Variscides, throughout uppermost Devonian to Early Carboniferous. Sulphide ores are usually hosted in volcanic-dominated or shale-dominated successions belonging to the VSC (Late Fammenian to Late Visean). Yet, several important orebodies at Neves Corvo are sitting within upper sections (Fammenian) of the early deposited Phyllite-Quartzite Group (PQG). Four key sectors of the Portuguese segment of IPB were revisited and 262 samples collected to characterize the geochemical features of metapelites from PQG and VSC sequences in barren and fertile settings. The selected sectors include active (Neves Corvo and Aljustrel) and old (Lousal) mines, besides promising brownfield (Gavião) and greenfield (Sesmarias) prospects, and other lithostratigraphic sections without known mineralization. The composition of PQG and VSC metapelites is similar and mainly controlled by a mixture of clayey-derived and quartz sandy-derived components largely resulting from different sources of granitic to granodiorite/quartz-diorite composition. Mineral transformations during diagenesis and/or hydrothermal alteration/mineralization partially overprinted the primary composition. During sedimentation/diagenesis, prevalent redox conditions were mostly confined to oxic environments, at places transiting to suboxic. Subsequent multi-stage interaction with reducing hydrothermal fluids (to which the sulphide mineralization is related) generated heterogeneous anoxic signs. Significant hydrothermal/mineralization imprints exist when Fe2O3/TiO2 ≥ 10 and Al2O3/(Al2O3+Fe2O3+MnO) ≤ 0.6. The 5x[(Fe2O3+MgO+MnO)/Al2O3], (Cu+Zn+Pb)/Sc and (As+Sb)/Sc geochemical ratios were recently proposed to separate barren from altered/mineralized metasedimentary successions in the IPB. When all these three ratios are above 10, a realistic vectoring towards massive sulphide accumulations occurs. From this dataset, 98 samples were chosen to conduct a Pb-Nd-Sr isotope study from different sections of the PQG and VSC successions (from Givetian to Upper Visean), including footwall and hanging wall domains of mineralized horizons in Neves Corvo, Aljustrel and Lousal. An extensive review of the isotopic data for pelite rocks in the IPB allow the evaluation of their sources and the potential of radiogenic isotopes as exploration tools, when combined with trace element geochemistry. The whole-rock Nd and Sr isotopic compositions along with Th/Sc ratios shows that PQG and VSC sediments are mostly composed of a silicilastic mix supplied by the dismantling of an old basement: -11 ≤ ƐNdi ≤ -8; 87Sr/86Sri up to 0.727; and TDM ages ranging from 1.08 to 1.91 Ga (̅ = 1.67 ± 0.16 Ga). The rising of ƐNdi values recorded by many samples of upper VSC (up to ± 0.2 in the Aljustrel sector) is interpreted as a result of local incorporation of volcanic-derived contributions completed during sedimentation processes during and after Upper Tournaisian. The PQG succession, at times complemented by VSC thick piles, represent the main crustal reservoirs of metals that supplied the hydrothermal inflows in IPB, which were dominated by modified seawater. Other sources, more radiogenic, should be involved in the IPB metal budget when the role of Sn- and Cu-rich fluids became central in the ore system, as documented for the Neves Corvo deposit. The increasing of 207Pb/204Pbi ratios in sediments is sensitive to the circulation of mineralizing fluids. On the contrary, significant rise in 206Pb/204Pbi (and 207Pb/204Pb) values in sediments bearing disseminated sulphides other than pyrite only occur when conditions for a protracted interaction with radiogenic hydrothermal inflows of moderate to high temperature existed. The proximity to massive sulphide ore systems could be recognized in sedimentary levels of PQG and VSC whenever 207Pb/204Pbi > 15.60 together with other multi-elemental geochemical ratios such as Fe2O3/TiO2 and (Cu+Zn+Pb)/Sc > 10

Ensinar e aprender com as tecnologias : competências profissionais docentes

Elaboramos este relatório, no âmbito do Mestrado de Ensino de Informática, inserido na Prática de Ensino Supervisionada. Neste são apresentadas as atividades letivas e não letivas realizadas na escola básica 2,3 André Soares, bem como um enquadramento geral de questões teóricas pertinentes no ensino: o currículo, a planificação, a avaliação e as aprendizagens dos alunos. Deste constam, também, projetos educativos atividades realizadas na escola, de forma a dinamizar as atividades escolares para a comunidade educativa. Consta, ainda, de um projeto de investigação científica que foi implementado e que visou verificar a situação das tecnologias no ensino, através da realização de um estudo pequeno com a primeira turma a que realizamos a lecionação. A componente letiva, analisada neste documento, decorreu da prática de ensino supervisionada com duas turmas do 8ºano do ensino regular. Este relatório reflete, assim, a experiência vivida num contexto escolar do 3ºciclo, desempenhando as funções de docência bem como de professora investigadora. Todas as atividades e aprendizagens realizadas tiveram como fim a formação docente, reunindo o conhecimento, as práticas e a investigação com o sentido de crescimento ao nível profissional.Prepared this report under the Master of Teaching Computing, inserted in Supervised Teaching Practice. This shows the school activities and not held in school Semester Basic 2.3 André Soares, as well as a general framework of relevant theoretical issues in teaching: curriculum, planning, assessment and student learning. This included also designs educational activities at school, in order to boost school activities for the educational community. Reportedly also a scientific research project that was implemented and aimed at investigating the situation of technology in education, by conducting a small study with the first class that held the teaching. The component lective analyzed herein, ran the supervised teaching practice with two classes of 8th grade regular education. This report therefore reflects the experience in a school setting the 3rd cycle, performing the functions of teaching as well as teacher researcher. All activities and learning were carried out to end teacher training, bringing together the knowledge, practices and research in the sense of growth at the professional level

Cu- and Za-soil anomalies in the NE border of the South Portuguese Zone (Iberian Variscides, Portugal). Identified by multifractal and geostatistical analysis

Extensive Cu- and Zn-soil geochemical data in the Albernoa/Entradas–S. Domingos region (NE border of the Iberian Pyrite Belt, South Portuguese Zone) were examined to separate anomalies from background using the concentration–area fractal model. Distribution patterns of Cu and Zn concentrations in soil are primarily influenced by bedrock. The regional threshold values of Cu- and Zn-soil contents over metasedimentary sequences are 20–25 and 20–60 ppm, respectively, becoming 30–50 and 20–90 ppm, respectively, when metavolcanic rocks are present. The first-order threshold values for Cu are 80–90 ppm in soils over metasediments and 70–80 ppm in soils over sequences bearing metavolcanics. For Zn, the first-order threshold values are 40–80 and 90–100 ppm in soils over metasediments and metavolcanic rocks, respectively. Metasediments and metavolcanics comprising significant sulphide disseminations are outlined by Cu- and Zn-soil values above 100 and 300 ppm in soil, respectively. On the basis of these results, Alvares and Albernoa/Entradas areas emerge as the first priority targets for exploration. The observed non-coincidence of Cu- and Zn-soil anomalies in soil in the area could reflect difference in element dispersion during weathering, they mostly indicate distinct metal sources related to the original composition of different rock types or to chemical changes developed during Variscan deformation/re-crystallization path. The established regional baseline data can be used as reference for environmental studies

Artes plásticas e atividades educativas projeto 1St Museum

O presente trabalho tem por objetivo primário o desenvolvimento de um modelo de negócio (MN), focado na proposta de valor e segmentos de clientes, que permita a implementação do projeto 1St Museum. Este projeto visa promover a sensibilização dos públicos infantojuvenis, incentivando a aproximação da produção artística e desenvolvimento de atividades participativas no contexto das artes plásticas. Tem por intuito a valorização do processo artístico e promoção do pensamento criativo. Faz-se o enquadramento teórico dos serviços educativos dos museus, do sistema educativo português e contextualização sobre experiências multissensoriais. A recolha de informação primária - entrevistas a encarregados de educação e professores, análises de boas práticas e observação participante de uma experiência multissensorial - é outro ponto fulcral na construção da proposta de valor. Procedeu-se à análise do mercado envolvente ao projeto 1St Museum, por ser um elemento fundamental à sua implementação futura. Por último efetuou-se a proposta de modelo de negócio privilegiando os segmentos de clientes, o design da proposta de valor, a jornada do cliente, incluindo o design do espaço e as cores.The main purpose of this research is to generate a proposal for the development of a business model (BM) focused on a value proposition and costumer segment that facilitate the implementation of the project named 1St Museum. This project has the objective to promote and encourage the artistic creation as well as participative activities near a younger segment of the market, allowing them to have a closer proximity in the domain of plastic arts. This way, this project aims towards the valorization of the artistic process and promotion of creative thinking. The theoretical framework of the educational services is completed, as well as that of the Portuguese educational system and the contextualization of multi-sensorial experiences. The primary data collection - interviews to parents and professors, analysis of good practices and an active observation of a multi-sensorial experience - is yet another main point on the construction of the value proposition. The following step fell into a thorough analysis of the market in which the 1St Museum is encompassed, for it is a crucial element to its future implementation. For last, a business model was created having in mind the main costumer segments, the design of the value proposition, the client journey including the space design and its colors

Geochemistry of stream sediments southwards of the SW Variscan suture in Portugal (Guadiana and Chança river basins) : insights into element anomalies of variable origin and intensity

Stream sediment samples were collected in the Trindade–Chança region at 1034 sites for mineral exploration purposes during 1996–97. Concentrations of Cu, Zn, Pb, Co, Cr and Ni are high enough in most sample sites to allow data assessment by multi-element anomaly definition and threshold computation using the area concentration multifractal model technique. The regional threshold values are 20, 45, 30 and 15 ppm for Cu, Zn, Pb and Co respectively. Anomalies for Cu, Zn, Pb, Co, Cr and Ni are delimited by first order local threshold values at 40, 94, 70, 21, 37 and 42 ppm. The main anomalies are clustered to the east-southeast of the surveyed region and reflect mixed contributions from a variety of sources, namely different volcanic units with local contributions from pelite rocks, contamination from old (abandoned) mining activities and hydrothermal mineralisation controlled by different fault zones

Geochemistry of soils and stream sediments in the NE border of the Iberian Pyrite Belt : implications to mineral exploration

Workshop comemorativo do Ano Internacional dos Solos, uma iniciativa do Laboratório Nacional de Energia e Geologia, Comité IGCP da Unesco e Centro Ciência Viva do Lousal

A solidão nos idosos em função da rede de suporte social, no concelho de Vila do Bispo

Dissertação de mestrado, Gerontologia Social, Escola Superior de Educação e Comunicação, Escola Superior de Saúde, Universidade do Algarve, 2015De forma a identificar a influência da rede de suporte social na solidão em idosos realizou-se o presente estudo, cujo objetivo geral da presente investigação consiste em verificar se a satisfação com o suporte social condicionada pelas variáveis sociodemográficas e contextuais influencia a solidão sentida pelos idosos. Para isso, fez-se o estudo no concelho de Vila do Bispo e contou-se com a participação de 82 idosos, idades compreendidas entre os 65 e os 100 anos, com uma idade média de 83,61 anos. Trata-se de um estudo quantitativo de cariz descritivo, correlacional e transversal. Utilizou-se um questionário de caracterização sociodemográfica e duas escalas com adaptações: a Escala da Solidão – UCLA – Russel (adaptação Pocinho, 2007), e a “Escala de Satisfação com o Suporte Social (ESSS)” (adaptação de Ribeiro, 2011). Os principais resultados mostram a existência de relações significativas entre a satisfação com o suporte social e a solidão sentida pelos idosos, ou seja, quanto maior é a satisfação com o suporte social, menor são os sentimentos de solidão. Constatouse, ainda, a existência de diferenças estatisticamente significativas entre a rede social, a solidão e algumas variáveis sociodemográficas e contextuais na amostra do presente estud

Factores com influência nos parâmetros produtivos e reprodutivos numa vacada de raça Alentejana

Mestrado em Engenharia Zootécnica - Produção Animal - Instituto Superior de Agronomia / Faculdade de Medicina VeterináriaIt is well accepted that one of the biggest concerns of the beef producers is reducing the calving interval, because of the great impact it has on the productivity of the herd, as well as the productive parameters of their calves. All these factors are influenced by environmental conditions in which the environment and management, namely reproductive and feeding management can be highlighted. The aim of this work was to study the effect of farm, calving number, sex of the calf, year and season of births in the calving interval of the Alentejano cows in two farms (Paço and Pinheiros) belonging to Eugénio de Almeida Foundation. Also, the effects of farm, year and season of birth on the various productive parameters of steers produced were studied. The results obtained indicate the existence of a strong effect of year of birth, probably related to annual rainfall, as well as calving number on the calving interval. Also, the season of birth influenced the lenght of calving interval, revealing that the best seasons are spring and autumn. Also the year and season of birth had influences on the productive characteristics of animals, noting that the summer was clearly the season of births which showed worse results