Browsing by Author "Abreu, Maria Manuela"
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- Acid drainage potential at S. Domingos minePublication . Batista, Maria Joao; Matos, João Xavier; Abreu, Maria Manuela
- Avaliação por modelação em SIG da contaminação mineira por drenagem ácida em S. Domingos, Faixa Piritosa, AlentejoPublication . Batista, Maria Joao; Brito, M. G.; Abreu, Maria Manuela; Sousa, A. J.; Quental, Lídia; Vairinho, M. Margarida
- Chemical elements variation in leaves with different development stages of Cistus plants from S. Domingos mine area, South PortugalPublication . Batista, Maria Joao; Gonzalez-Fernandez, Oscar; Abreu, Maria Manuela; Carvalho, L.Soils and leaves of Cistus ladanifer L. and Cistus salviifolius L. in different stages of development (young and mature) were sampled in different sites of the S. Domingos mine. The soils are thin and were developed on heterogeneous materials of metallurgical slags, gossanous materials and weathered host rocks. In general, mature leaves have higher concentrations of As, Cu, Fe, Mn, Pb and Zn than young leaves. Nevertheless, in Moitinhos site the young leaves have higher concentrations of As, Cu and Mn than mature leaves. Near the mining buildings C. ladanifer leaves have higher concentrations of As in mature leaves than C. salviifolius. The Pb concentrations in mature leaves are significantly higher and C. ladanifer contain two fold more than C. salviifolius leaves. Cistus plants show different behaviour on the trace elements uptake and translocation. This knowledge is useful in order to implement remediation programs in mine areas of the Mediterranean region using these pioneer plants.
- Comportamento geoquímico de alguns elementos vestigiais na envolvente das Minas de S. Domingos, Alentejo : áreas da Tapada e do TelheiroPublication . Tavares, M. T.; Abreu, Maria Manuela; Vairinho, M. Margarida; Sousa, A. J.; Quental, Lídia
- Contribution of Cistus ladanifer L. to natural attenuation of Cu and Zn in some mine areas of the Iberian Pyrite BeltPublication . Batista, Maria Joao; Abreu, Maria ManuelaThe comparison between four groups of soils and rock plants (Cistus ladanifer L.) developed on these soils was made using three mine areas of different ages (Neves Corvo, Brancanes, Monte dos Mestres) and a control area (Lombador). Copper and zinc soil-plant realtionship was different in Neves Corvo, ongoing axploitation of copper and zinc, when compared with the control area of Lombador reflecting the actual influence of the present exploitation. The rock rose plants seem to have contributed to the natural attenuation of Cu in soils of Brancanes area where mining stopped more then a century ago.
- Distribuição de estanho em solos e em estevas da área envolvente das minas de Neves CorvoPublication . Batista, Maria Joao; Abreu, Maria Manuela; Pinto, M. Serrano
- Geochemical exploration and assessment of environmental impacts in the Portuguese sector of the Iberian Pyrite BeltPublication . Batista, Maria Joao; Mateus, A; Matos, João Xavier; Gonçalves, Mário A.; Figueiras, Jorge; Abreu, Maria Manuela; Luz, FilipaABSTRACT: This work intends to briefly report the history and application of geochemical exploration techniques in the Iberian Pyrite Belt (IPB). The use of geochemistry in IPB for exploration purposes started in 1950s. Together with geophysics, the soil geochemical exploration surveys performed over several decades were responsible for important discoveries such as Carrasco and Feitais ore-bodies. However, the continuous development of analytical methods and the progress in data processing/modelling led to significant changes in the planning of sampling surveys, and their specific objectives, as well as in the accuracy of geochemical anomalies definition and corresponding interpretation. As a consequence, the number of samples involved in each survey was significantly reduced, but the chemical elements analysed with improved detection limits were considerably extended; additionally, geochemical anomalies were better resolved. Notwithstanding this evolution, data obtained in early soil geochemical surveys (notably by the Serviço de Fomento Mineiro) are still useful in the development of preliminary approaches at a regional scale. Over the years, many studies were made for exploration and environmental assessments, the most relevant of them reported in this chapter. Natural distributions of chemical elements were also identified in these studies as background (if pristine conditions are present) or baseline (depending how disturbed is the area covered by the sampling survey) values. Large part of IPB was, and still is, subjected to poly-metallic mineral exploration or mining, being also the focus of environmental evaluation and/or remediation projects on particular areas that, being the target of long-lasting human intervention, represent paradigmatic case-study examples. The exploration and exploitation works carried out by national and foreign private companies were, and still are, very important for innovative achievements in IPB along with copious contributions from the Portuguese R&D public institutions. Presently, LNEG possesses a vast quantity of geochemical data that can be provided for companies that wish to start their activity in the IPB; some of these datasets are compiled to a unique integrative map also presented in this work. Stream-sediments geochemistry, hydrogeochemistry and lithogeochemistry (of outcropping rock and drill-core samples) represent also important sources of geochemical data in regional or detailed studies over specific target areas in the IPB. However, these techniques are beyond the scope of the present paper which aimed at providing a general overview of the importance of soil geochemistry studies in the current knowledge of the IPB.
- Geochemical exploration and assessment of environmental impacts in the Portuguese sector of the Iberian Pyrite BeltPublication . Batista, Maria Joao; Mateus, António; Matos, João Xavier; Gonçalves, M. A.; Figueiras, Jorge; Abreu, Maria Manuela; Luz, FilipaABSTRACT: This work intends to briefly report the history and application of geochemical exploration techniques in the Iberian Pyrite Belt (IPB). The use of geochemistry in IPB for exploration purposes started in 1950’s. Together with geophysics, the soil geochemical exploration surveys performed over several decades were responsible for important discoveries such as Carrasco and Feitais ore-bodies. However, the continuous development of analytical methods and the progress in data processing/modelling led to significant changes in the planning of sampling surveys, and their specific objectives, as well as in the accuracy of geochemical anomalies definition and corresponding interpretation. As a consequence, the number of samples involved in each survey was significantly reduced, but the chemical elements analysed with improved detection limits were considerably extended; additionally, geochemical anomalies were better resolved. Notwithstanding this evolution, data obtained in early soil geochemical surveys (notably by the Serviço de Fomento Mineiro) are still useful in the development of preliminary approaches at a regional scale. Over the years, many studies were made for exploration and environmental assessments, the most relevant of them reported in this chapter. Natural distributions of chemical elements were also identified in these studies as background (if pristine conditions are present) or baseline (depending how disturbed is the area covered by the sampling survey) values. Large part of IPB was, and still is, subjected to poly-metallic mineral exploration or mining, being also the focus of environmental evaluation and/or remediation projects on particular areas that, being the target of long-lasting human intervention, represent paradigmatic case-study examples. The exploration and exploitation works carried out by national and foreign private companies were, and still are, very important for innovative achievements in IPB along with copious contributions from the Portuguese R&D public institutions. Presently, LNEG possesses a vast quantity of geochemical data that can be provided for companies that wish to start their activity in the IPB; some of these datasets are compiled to a unique integrative map also presented in this work. Stream-sediments geochemistry, hydrogeochemistry and lithogeochemistry (of outcropping rock and drill-core samples) represent also important sources of geochemical data in regional or detailed studies over specific target areas in the IPB. However, these techniques are beyond the scope of the present paper which aimed at providing a general overview of the importance of soil geochemistry studies in the current knowledge of the IPB.
- Identification of materials related to acid mine drainage using multi-source spectra at S. Domingos Mine, SE PortugalPublication . Quental, Lídia; Sousa, António Jorge de; Marsh, Stuart; Abreu, Maria Manuela
- Imaging spectroscopy answers to acid mine drainage detection at S. Domingos, Iberian Pyrite Belt, PortugalPublication . Quental, Lídia; Sousa, A. J.; Marsh, Stuart; Brito, G.; Abreu, Maria Manuela