{"id":2545,"date":"2020-08-03T10:08:47","date_gmt":"2020-08-03T10:08:47","guid":{"rendered":"http:\/\/www.icterra.pt\/?p=2545"},"modified":"2020-08-03T13:14:34","modified_gmt":"2020-08-03T13:14:34","slug":"comunicacoes-geologicas-laboratorio-nacional-de-energia-e-geologia-xii-congresso-iberico-de-geoquimica-e-xx-semana-de-geoquimica","status":"publish","type":"post","link":"https:\/\/www.icterra.pt\/legacy\/index.php\/2020\/08\/03\/comunicacoes-geologicas-laboratorio-nacional-de-energia-e-geologia-xii-congresso-iberico-de-geoquimica-e-xx-semana-de-geoquimica\/","title":{"rendered":"Comunica\u00e7\u00f5es Geol\u00f3gicas – Laborat\u00f3rio Nacional de Energia e Geologia. XII Congresso Ib\u00e9rico de Geoqu\u00edmica e XX Semana de Geoqu\u00edmica"},"content":{"rendered":"

O XII Congresso Ib\u00e9rico de Geoqu\u00edmica e a XX Semana de Geoqu\u00edmica (XII CIG | XX SG), <\/span>decorreu em \u00c9vora, em setembro de 2019, com organiza\u00e7\u00e3o conjunta do Departamento de <\/span>Geoci\u00eancias da Universidade de \u00c9vora, do Instituto de Ci\u00eancias da Terra e do Laborat\u00f3rio <\/span>HERCULES.<\/span>
\nNo seguimento do XII CIG | XX SG (2019), foi possibilitada a publica\u00e7\u00e3o de uma vers\u00e3o alargada <\/span>dos trabalhos melhor avaliados pela comiss\u00e3o cient\u00edfica do congresso. Desta sele\u00e7\u00e3o resultou a <\/span>edi\u00e7\u00e3o do Volume 107, Fasc\u00edculo II da revista Comunica\u00e7\u00f5es Geol\u00f3gicas do Laborat\u00f3rio <\/span>Nacional de Energia e Geologia. A edi\u00e7\u00e3o especial deste volume teve como editores quatro <\/span>membros do ICT-Polo de \u00c9vora, s\u00e3o eles, Pedro Nogueira; Noel Moreira; Miguel Maia e <\/span>Jos\u00e9 Roseiro.<\/span><\/p>\n

Este volume especial pode ser acedido aqui: https:\/\/www.lneg.pt\/comunicacoes-<\/a><\/span>geologicas\/consultar-artigos\/<\/span><\/p>\n

Trabalhos de membros do ICT neste volume:<\/span><\/p>\n

1. Crustal stretching process denounced by mafic magmatism in the Finisterra <\/span>Terrane; the yield of a back-arc basin?<\/span><\/strong>
\nNoel Moreira, Fernando Noronha, Jorge Pedro, Jos\u00e9 Rom\u00e3o, Rui Dias, M\u00f3nica Sousa, Ant\u00f3nio <\/span>Ribeiro, Jos\u00e9 Roseiro<\/span><\/p>\n

Link<\/a><\/span><\/p>\n

Abstract: The occurrence of a new tectono-stratigraphic terrane (Finisterra Terrane), located in <\/span>the westernmost domains of the PortoTomar-Ferreira do Alentejo Shear Zone, has been <\/span>highlighted in the last few years. Nevertheless, there are several gaps in the geological <\/span>knowledge of this Terrane, including the interpretation of existing data in the framework of <\/span>the new tectono-stratigraphic terrane proposal, with an independent evolution from the <\/span>Iberian Terrane. This work is an approach to the mafic magmatism significance that is <\/span>described in the tectonostratigraphic units from Abrantes-Tomar and Porto-Espinho-<\/span>Albergariaa-Velha sectors of the Finisterra Terrane. The geochemical data of the amphibolite <\/span>rocks show affinities with mafic and ultramafic protholits with geochemical features between <\/span>within-plate basalts and MORB. These amphibolites express specific geochemical features (e.g. <\/span>N-MORB normalized Ba and Th enrichments, as well as Nb and Ta anomalies), suggesting their <\/span>emplacement in a back-arc basin tectonic setting. <\/span><\/p>\n

Keywords: Finisterra Terrane, mafic magmatism, geochemistry, crustal stretching, back-arc<\/span>
\nbasin magmatism.<\/span><\/p>\n

 <\/p>\n

2. Depositional environment and passive-to-active margin transition as recorded by <\/span><\/strong>trace elements chemistry of lower-middle Palaeozoic detrital units from the Ossa-<\/span><\/strong>Morena Zone (SW Iberia)<\/span><\/strong>
\nJos\u00e9 Roseiro, Noel Moreira, Pedro Nogueira, Miguel Maia, Ant\u00f3nio Ara\u00fajo, Jorge Pedro<\/span><\/p>\n

Link<\/span><\/a><\/p>\n

Abstract: New lithogeochemical data of Lower-Middle Palaeozoic metasedimentary rocks of <\/span>the Ossa-Morena Zone are here presented and integrated with previously published data, as <\/span>well as a discussion on their provenance and geotectonic settings. In the Cambrian \u2013 Lower <\/span>Ordovician rift stages, metasediments mostly derived from an acid continental source with <\/span>passive margin geochemical affinities, showing a significant recycled sediment component, as <\/span>well as an oxidizing depositional environment. Metasediments related with the drift stage, <\/span>during Ordovician and Silurian ages, display general geochemical features similar to those that <\/span>characterize the Cambrian units, inferring the prevailing acid source and passive margin <\/span>geotectonic settings, and slightly anoxic depositional conditions in the end of this stage. In <\/span>turn, geochemistry of samples representative of the Devonian debris deposition contrast with <\/span>the passive continental margin geochemical data; notwithstanding the dominant acid source, <\/span>an increased trend for a basic\/intermediate sedimentary component can be observed, thus <\/span>inferring a contribution of an external volcanic (probably subductionrelated) source during <\/span>Devonian ages. These interpretations are in accordance with other studies regarding north <\/span>Gondwana rift and drift stages during Cambrian-Silurian times and active margin settings <\/span>during Devonian.<\/span><\/p>\n

Keywords: Ossa-Morena Zone, sedimentary provenance, detrital units, lithogeochemistry.<\/span><\/p>\n

 <\/p>\n

3. Portable X-ray fluorescence and clustering methods applied to mineral <\/span><\/strong>exploration: the significance and nature of Batigelas anomaly (Ossa-Morena Zone – <\/span><\/strong>Cabe\u00e7o de Vide, Portugal)<\/span><\/strong>
\nPedro Nogueira, Paula Afonso, Jos\u00e9 Roseiro, Miguel Maia, Diogo S\u00e3o Pedro, Noel Moreira, Jo\u00e3o<\/span>
\nXavier Matos, Maria Jo\u00e3o Batista<\/span><\/p>\n

Link<\/span><\/a><\/p>\n

Abstract: Batigelas is a mineral occurrence in the Alter do Ch\u00e3o-Elvas Sector of the Ossa-<\/span>Morena Zone that was studied by the Servi\u00e7o de Fomento Mineiro, including soil geochemistry <\/span>and terrestrial geophysics, revealing anomalous metal contents combined with contrasting <\/span>magnetic values. The results obtained justified the execution of a cored drill hole. New soil <\/span>geochemistry campaign, using a portable X-ray fluorescence, has yielded new detailed results, <\/span>with a set of elemental analysis for the region. The application of clustering methods <\/span>(hierarchical and k-means clustering) to the analyses allowed to detail not only the initial <\/span>anomaly identified, but also to discriminate the outcropping lithological units in the region. <\/span>The obtained results highlight the presence of a cryptic Zn-Pb anomalous occurrence, thus <\/span>emphasizing the importance of these techniques in mineral exploration campaigns, providing <\/span>new exploration pathfinders.<\/span><\/p>\n

Keywords: Batigelas, portable X-ray fluorescence, k-means clustering, hierarchical clustering.<\/span><\/p>\n

 <\/p>\n

4. High resolution geochemical mapping in the Moci\u00e7os mine (Ossa-Morena Zone, <\/span><\/strong>Portugal).<\/span>Contributes from machine learning methods<\/span><\/strong>
\nPedro Nogueira, Sandro Vicente, Miguel Maia, Jos\u00e9 Roseiro, Noel Moreira, Jo\u00e3o Xavier Matos<\/span><\/p>\n

Link<\/span><\/a><\/p>\n

Abstract: The Moci\u00e7os mine is a Cu-rich quartz-carbonate vein-type deposit hosted in the <\/span>Palaeozoic detrital metasediments of the OssaMorena Zone (SW Portugal), exploited during <\/span>the beginning of the XX century. A soil geochemistry campaign was carried out, with a portable <\/span>X-Ray Fluorescence, in order to estimate metal distribution throughout the Moci\u00e7os mine, <\/span>followed by summary statistics, interpolation mapping and different machine learning <\/span>methodological studies (PCA, hclust and k-means) of the obtained data set. Overall results <\/span>showed that soil geochemistry in the Moci\u00e7os mine is spatially variable, in which three main <\/span>populations were recognized (distinguished by all machine learning methods, but better <\/span>defined by PCA and k-means) and correlated with geological features: i) the mineralized vein, <\/span>gossan structures, mine tailings and felsic rocks, ii) the geochemical background and iii) a <\/span>chemically contrasting (Zn higher than regional average) zone. This methodological approach is <\/span>plausible with typical metal accumulationdispersion mechanisms in these environments and <\/span>confirms the relevance of multivariate geochemistry studies for mineral exploration purposes, <\/span>and of machine learning methods applied to mineral exploration.<\/span><\/p>\n

Keywords: Principal components analysis, hierarquical clustering, kmeans, Mineral <\/span>exploration.<\/span><\/p>\n

 <\/p>\n

5. Bacias de drenagem de sedimentos de corrente aplicadas \u00e0 prospe\u00e7\u00e3o de <\/span>elementos met\u00e1licos; uma proposta de metodologia e a sua aplica\u00e7\u00e3o na prospe\u00e7\u00e3o <\/span>de ouro e antim\u00f3nio no Distrito D\u00farico-Beir\u00e3o<\/span><\/strong>
\nAdriana Batista, Alexandre Lima, Helena Sant\u2019Ovaia<\/span><\/p>\n

Link<\/span><\/a><\/p>\n

Resumo: O presente trabalho tem como objetivo principal propor um procedimento <\/span>metodol\u00f3gico simples, de baixo custo, utilizando as ferramentas de um SIG. O procedimento <\/span>prop\u00f5e a cria\u00e7\u00e3o de um conjunto de bacias de drenagem, tendo como base o cruzamento <\/span>entre os dados geomorfol\u00f3gicos e geoqu\u00edmicos de sedimentos de corrente. Como objeto de <\/span>estudo utilizou-se um sector no Distrito D\u00farico-Beir\u00e3o, caracterizado pela ocorr\u00eancia de \u00e1reas <\/span>potenciais para explora\u00e7\u00e3o de Au e Sb. Com os dados de sedimentos de corrente foram criadas <\/span>bacias de drenagem e ap\u00f3s a aplica\u00e7\u00e3o de todo o processamento, foram contabilizadas 81 <\/span>bacias muito a extremamente enriquecidas em ouro e 112 bacias muito a extremamente <\/span>enriquecidas em antim\u00f3nio, comparativamente ao teor da crusta superior. Parte destas bacias <\/span>foram zonas de antigas explora\u00e7\u00f5es de ouro e antim\u00f3nio e as restantes poder\u00e3o ser novas <\/span>\u00e1reas de prospe\u00e7\u00e3o. A metodologia proposta poder\u00e1 ser muito \u00fatil na sua descoberta, <\/span>destacando o facto de ser um m\u00e9todo r\u00e1pido e que n\u00e3o envolve custos elevados.<\/span><\/p>\n

Palavras-chave: Bacias de drenagem, geoqu\u00edmica de sedimentos de corrente, prospe\u00e7\u00e3o<\/span>
\nmineral, sistemas de informa\u00e7\u00e3o geogr\u00e1fica.<\/span><\/p>\n

 <\/p>\n

6. Thermal evolution of the W-Sn(-Cu) Panasqueira ore system (Portugal): insights <\/span>from pyritepyrrhotite and arsenopyrite geothermometers<\/span><\/strong><\/p>\n

Ivo Martins, Ant\u00f3nio Mateus, J. Figueiras, P. Rodrigues, Filipe Pinto<\/span><\/p>\n

Link<\/span><\/a><\/p>\n

Abstract: Panasqueira is a world-class W-Sn(-Cu) lode-type deposit hosted in metasedimentary <\/span>sequences. Recurrent sulphide deposition throughout the paragenetic sequence allows the use <\/span>of pyrite-pyrrhotite and arsenopyrite geothermometers to constrain some steps of the <\/span>temperature-path in time. Precipitation of arsenopyrite I occurred during the 1st evolving <\/span>stage at 498 \u00b1 46 \u00baC and log a(S2) of -5.974 \u00b1 1.944. The 2nd evolving stage onset included the <\/span>arsenopyrite II growth at 468 \u00b1 8 \u00baC and log a(S2) of -5.092 \u00b1 0.247, and the somewhat late <\/span>deposition of pyrrhotite I at 406 \u00b1 3 \u00baC and log a(S2) of -6.962 \u00b1 0.097. The 3rd evolving stage <\/span>comprised the formation of arsenopyrite III at 437 \u00b1 27 \u00baC and log a(S2) of -5.860 \u00b1 0.953. <\/span>These results are consistent with other information independently compiled on the thermal <\/span>evolution of the Panasqueira system, supporting the inference of an important <\/span>magmatichydrothermal rejuvenation episode after the 2nd depositional stage.<\/span><\/p>\n

Keywords: Panasqueira, lode-type deposit, T-X evolution, mineral chemistry, sulphide<\/span>
\nthermochemistry.<\/span><\/p>\n

 <\/p>\n

7. Nb-bearing mineral phases in the Bailundo Carbonatite Complex (Angola): <\/span>implications of Nb <\/span>geochemistry in metallogenesis<\/span><\/strong><\/p>\n

Jos\u00e9 Roseiro, I. Ribeiro da Costa, J. Figueiras, P. Rodrigues, Ant\u00f3nio Mateus<\/span><\/p>\n

Link<\/span><\/a><\/p>\n

Abstract: Pyrochlore group minerals are common accessory phases in many rock types of the <\/span>Bailundo Carbonatite Complex. These minerals record compositional and textural features that <\/span>provide useful information regarding their genesis and accumulation, monitoring magmatic, <\/span>metasomatic and weathering events. In drill core samples, primary compositions (significant Ta <\/span>and U contents, and relatively low Nb and F values) are found in relict cores of strongly <\/span>metasomatized pyrochlore grains; irregular patches in pyrochlore rims, typically enriched in F, <\/span>Na and Nb, reflect fluid alteration fronts. At shallower levels, preserved pyrochlores show well-<\/span>defined concentric zoning and substantially higher values of F and Nb. In the weathering <\/span>profile, alteration processes include replacement of F, Na and Ca by Ba, Sr, Pb and H2O. These <\/span>data suggest the possibility of Nb concentration in late-magmatic fluids as fluoride complexes, <\/span>and its subsequent mobilization and crystallization in the form of pyrochlore at shallower <\/span>levels of the Bailundo Carbonatite Complex.<\/span><\/p>\n

Keywords: Pyrochlore Group Minerals, Bailundo Carbonatite Complex, Nb-mineralization.<\/span><\/p>\n

 <\/p>\n

8. The Ossa-Morena Marbles used in the Classical Antiquity: review of their <\/span>petrographic features and isotopic data<\/span><\/strong><\/p>\n

Noel Moreira, Jorge Pedro, Lu\u00eds Lopes, A. Carneiro, N. Mourinha, A. Ara\u00fajo, J. F. Santos<\/span><\/p>\n

Link<\/span><\/a><\/p>\n

Abstract: The use of marbles during the Classical Antiquity, namely in the Roman Period, was a <\/span>common practice, being extended during the 1st century. During this historical period, <\/span>Hispania (Iberian Peninsula) was not an exception and there are several places where marbles <\/span>were exploited with ornamental or architectonic purposes. In places like the Estremoz <\/span>Anticlinal, Viana do Alentejo region, Trigaches-S\u00e3o Brissos, Alconera and Almad\u00e9n de la Plata, <\/span>evidence of ancient exploitation, attributed to the Roman Period, were recognized. In this <\/span>work, these marbles are petrographically characterized and the published isotope data, <\/span>namely regarding the \u03b413C – \u03b4 18O pair and 87Sr\/86Sr ratio, are analyzed and discussed in the <\/span>context of the geological processes and their application in provenance studies of materials <\/span>used during Roman Period. The available data show that the application of both isotopic and <\/span>petrographic studies allows the distinction of the several marbles of the Ossa-Morena Zone <\/span>from each other, therefore ascribing a probable provenance for the classical marbles of this <\/span>paleogeographic zone.<\/span><\/p>\n

Keywords: Marbles, Ossa-Morena Zone, classical antiquity, isotope geology, petrography.<\/span><\/p>\n

 <\/p>\n

9. Experiments on mineral carbonation of CO2 in gabbro from the Sines massif \u2013 first <\/span>results of<\/span><\/strong>
\nproject InCarbon<\/span><\/strong><\/p>\n

Patr\u00edcia Moita, E. Berrezueta, Jorge Pedro, C. Miguel, M. Beltrame, C. Galacho, Pedro Barrulas, <\/span>Jos\u00e9 Mir\u00e3o, A. Ara\u00fajo, Lu\u00eds Lopes, J\u00falio Carneiro<\/span><\/p>\n

Link<\/span><\/a><\/p>\n

Abstract: The InCarbon project based on the principles of CO2 capture and storage <\/span>technologies, aims to study the potential of in situ mineral carbonation in mafic rocks in <\/span>Alentejo. The gabbro of Sines massif was selected for the first laboratory test of mineral <\/span>carbonation due to its geochemical, mineralogical and textural characteristics and proximity to <\/span>the main focus of CO 2 emissions in the region. Gabbro specimens were submerged in natural <\/span>brine and supercritical CO 2 for periods of 1, 4, 16 and 64 days, under 80 bar and 40 \u00baC. The <\/span>specimens were characterized before and after the experiments by means of XRD, OM, VP-<\/span>SEM-EDS and ATR-FTIR, and the brine composition was analysed. Results show dissolution of <\/span>silicates and textural roughness increasing with the number of days of immersion into brine. <\/span>The behaviour of cations in solution after several days of testing is irregular and carbonate <\/span>precipitation was not detected. Keywords: CCS, gabbro, Sines, Brine, Supercritical CO 2<\/span><\/p>\n

 <\/p>\n

10. Primeiros dados geoqu\u00edmicos das lignites de uma nova ocorr\u00eancia no Bilene, <\/span>Gaza, Mo\u00e7ambique<\/span><\/strong><\/p>\n

Deolinda Flores, Isabel Su\u00e1rez-Ruiz, N. Nhamutole, D. Milisse, R. Ara\u00fajo<\/span><\/p>\n

Link<\/span><\/a><\/p>\n

Resumo: As camadas de lignite do Pleistoc\u00e9nico que afloram a sul do Bilene constituem um <\/span>dep\u00f3sito lagunar associado a um sistema de lagos costeiros com grandes dunas m\u00f3veis. O <\/span>estudo geoqu\u00edmico de cinco amostras destas lignites \u00e9 apresentado neste trabalho. As lignites <\/span>apresentam rendimentos em cinzas elevados, sendo por isso consideradas rochas carbonosas, <\/span>e teores em mat\u00e9rias vol\u00e1teis, C, H, N e O s\u00e3o considerados normais para lignites. O teor em <\/span>enxofre total (St) \u00e9 baixo. As raz\u00f5es at\u00f3micas H\/C e O\/C confirmam o grau de evolu\u00e7\u00e3o da <\/span>mat\u00e9ria org\u00e2nica. A composi\u00e7\u00e3o em elementos maiores corrobora a composi\u00e7\u00e3o mineral\u00f3gica <\/span>identificada numa das amostras estudas. O CaO e o St est\u00e3o associados \u00e0 mat\u00e9ria org\u00e2nica, <\/span>ocorrendo o Ca associado aos humatos. A maioria dos elementos tra\u00e7o apresentam afinidade <\/span>interm\u00e9dia. O Zr e o Hf encontram-se ligeiramente a significativamente enriquecidos e est\u00e3o <\/span>associados ao zirc\u00e3o. Nestas amostras o As evidencia afinidade org\u00e2nica. O Rb apresenta <\/span>afinidade inorg\u00e2nica ocorrendo em silicatos.<\/span><\/p>\n

Palavras-chave: Bilene, Mo\u00e7ambique, lignite, geoqu\u00edmica org\u00e2nica, geoqu\u00edmica inorg\u00e2nica.<\/span><\/p>\n

 <\/p>\n

11. Estudo geoqu\u00edmico dos coques naturais da Bacia de Pe\u00f1arroya-Belmez-Espiel <\/span>(Espanha)<\/span><\/strong><\/p>\n

Helena Moura, M. M. Marques, I. Suar\u00e9z-Ruiz, J. Ribeiro, P. P. Cunha, Deolinda Flores<\/span><\/p>\n

Link<\/span><\/a><\/p>\n

Resumo: Os coques naturais que ocorrem no sector leste do Depocentro I da Bacia de <\/span>Pe\u00f1arroya Belmez-Espiel resultaram de metamorfismo de contacto induzido nos carv\u00f5es <\/span>aquando da implanta\u00e7\u00e3o de uma soleira doler\u00edtica paralelamente \u00e0 estratifica\u00e7\u00e3o. Neste <\/span>trabalho apresentam-se dados petrogr\u00e1ficos e geoqu\u00edmicos de tr\u00eas amostras de coques. As <\/span>part\u00edculas org\u00e2nicas apresentam poros de desvolatiliza\u00e7\u00e3o circulares ou el\u00edpticos, textura <\/span>isotr\u00f3pica e, ocasionalmente, textura anisotr\u00f3pica incipiente ou mosaico fino, indicando que a <\/span>reflect\u00e2ncia da vitrinite era de 0,70% a 0,85% aquando do aquecimento. A reflect\u00e2ncia m\u00e1xima <\/span>das part\u00edculas de coque permite inferir uma paleotemperatura para a soleira &gt; 390 \u00baC. Por sua <\/span>vez, o alinhamento e dobramento dos poros sugerem que a implanta\u00e7\u00e3o da soleira doler\u00edtica <\/span>foi simult\u00e2nea ao dobramento da sucess\u00e3o sedimentar. O rendimento em cinzas \u00e9 vari\u00e1vel, o <\/span>teor em C elevado e o St muito baixo. O enriquecimento em Hg parece estar associado \u00e0 <\/span>circula\u00e7\u00e3o dos fluidos magm\u00e1ticos e, ainda, a processos secund\u00e1rios.<\/span><\/p>\n

Palavras-chave: Bacia de Pe\u00f1arroya-Belmez-Espiel, coque natural, aspectos petrogr\u00e1ficos, <\/span>composi\u00e7\u00e3o geoqu\u00edmica, merc\u00fario.<\/span><\/p>\n

 <\/p>\n

12. Caracteriza\u00e7\u00e3o hidrogeoqu\u00edmica de efluentes da mina de carv\u00e3o de S\u00e3o Pedro da <\/span>Cova (Gondomar)<\/span><\/strong><\/p>\n

Jo\u00e3o Rocha, Patr\u00edcia Santos, Joana Ribeiro, Jorge Espinha Marques, C.Mansilha, Deolinda Flores<\/span><\/p>\n

Link<\/span><\/a><\/p>\n

Resumo: A mina de S\u00e3o Pedro da Cova, localizada no Norte de Portugal, \u00e9 uma mina de carv\u00e3o <\/span>abandonada cujos efluentes s\u00e3o drenados atrav\u00e9s de duas galerias. Este estudo tem como <\/span>objetivo a caracteriza\u00e7\u00e3o hidrogeoqu\u00edmica destes efluentes e da linha de \u00e1gua para a qual s\u00e3o <\/span>drenados, atrav\u00e9s da an\u00e1lise de \u00e1guas com e sem influ\u00eancia da drenagem mineira. As \u00e1guas <\/span>foram analisadas in situ, atrav\u00e9s da medi\u00e7\u00e3o do pH, condutividade el\u00e9trica e temperatura, e no <\/span>laborat\u00f3rio, atrav\u00e9s da determina\u00e7\u00e3o da concentra\u00e7\u00e3o de i\u00f5es maiores e de metais pesados. <\/span>Os resultados indicam que as \u00e1guas de drenagem mineira apresentam pH neutro ou <\/span>aproximadamente neutro, condutividade el\u00e9trica alta, bem como elevada concentra\u00e7\u00e3o em <\/span>algus metais, com destaque para Fe e Mn. As \u00e1guas de drenagem mineira apresentam f\u00e1cies <\/span>SO4-Mg. A concentra\u00e7\u00e3o de metais e a f\u00e1cies hidrogeoqu\u00edmica destas \u00e1guas confirmam a <\/span>contamina\u00e7\u00e3o de origem mineira nestas \u00e1guas.<\/span><\/p>\n

Palavras-chave: Explora\u00e7\u00e3o de carv\u00e3o, drenagem mineira, metais pesados, f\u00e1cies <\/span>hidrogeoqu\u00edmica.<\/span><\/p>\n

 <\/p>\n

13. Caracteriza\u00e7\u00e3o da contamina\u00e7\u00e3o dos solos da envolvente da escombreira da <\/span>antiga mina de carv\u00e3o de S\u00e3o Pedro da Cova<\/span><\/strong>
\nPatr\u00edcia Santos, Jorge Espinha Marques, Joana Ribeiro, Jo\u00e3o Rocha, Deolinda Flores<\/span><\/p>\n

Link<\/span><\/a><\/p>\n

Resumo: A mina de carv\u00e3o de S\u00e3o Pedro da Cova laborou entre 1795 e 1972, tendo produzido <\/span>como parte do seu passivo ambiental uma escombreira com cerca de 28 000 m2 , que tem <\/span>sofrido fen\u00f3menos de autocombust\u00e3o de modo continuado desde 2005. Com vista \u00e0 <\/span>caracteriza\u00e7\u00e3o da contamina\u00e7\u00e3o dos solos nas imedia\u00e7\u00f5es da escombreira, foram recolhidas 50 <\/span>amostras de solo, tendo-se procedido a an\u00e1lises geoqu\u00edmicas multielementares por ICP-MS e <\/span>posterior compara\u00e7\u00e3o com os valores de refer\u00eancia para solos sugeridos pela Ag\u00eancia <\/span>Portuguesa do Ambiente. Verificou-se que os solos pr\u00f3ximos da escombreira, em grande <\/span>percentagem superam os valores limite previstos para alguns elementos, de destacar o Sb, Ba, <\/span>U, As, V, Be, Cr, Mo, Pb e Se, quer a montante, quer a jusante da escombreira, indicando uma <\/span>forte contamina\u00e7\u00e3o antropog\u00e9nica, possivelmente potenciada pela dissemina\u00e7\u00e3o de <\/span>contaminantes a partir da escombreira de carv\u00e3o adjacente, quer por lixivia\u00e7\u00e3o, quer por via <\/span>a\u00e9rea.<\/span>
\nPalavras-chave: Solo, contamina\u00e7\u00e3o, escombreira, carv\u00e3o.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

O XII Congresso Ib\u00e9rico de Geoqu\u00edmica e a XX Semana de Geoqu\u00edmica (XII CIG | XX SG), decorreu em \u00c9vora, em setembro de 2019, com organiza\u00e7\u00e3o conjunta do Departamento de Geoci\u00eancias da Universidade de \u00c9vora, do Instituto de Ci\u00eancias da Terra e do Laborat\u00f3rio HERCULES. No seguimento do XII CIG | XX SG (2019), foi […]<\/p>\n","protected":false},"author":3,"featured_media":2549,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15,1],"tags":[],"_links":{"self":[{"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/posts\/2545"}],"collection":[{"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/comments?post=2545"}],"version-history":[{"count":2,"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/posts\/2545\/revisions"}],"predecessor-version":[{"id":2550,"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/posts\/2545\/revisions\/2550"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/media\/2549"}],"wp:attachment":[{"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/media?parent=2545"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/categories?post=2545"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.icterra.pt\/legacy\/index.php\/wp-json\/wp\/v2\/tags?post=2545"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}