Stratiform Sb and Au mineralizations in the Hercynian Dúrico-Beirã area (North Portugal)

Couto, Helena; Borges, Frederico Sondré

doi:10.1007/3-540-27946-6_25

Cited by 5 publications

(6 citation statements)

References 2 publications

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“…The elements with affinities to sulfur are Fe, As and Sb, which may result from the presence of pyrite and chalcopyrite, whereas Sb may be due to the presence of antimony mineralization recognized in this area and described as pre-concentrated in the breccia from TSU A1 (see Figure 2) as referred by Couto [81]. Therefore, and observing the dendrogram corresponding to this unit (Figure 16), it is once again distinguishable two main groups, one corresponding to the organic affinities, which also coincide with the affinities for sulfur, while the other corresponds to the elements of inorganic affinities, coinciding with the affinities of aluminosilicates, where the REE are included.…”

Section: Geochemical Affinities Of the Trace Elementsmentioning

confidence: 92%

Effects of Magmatic Fluids in Coals of São Pedro da Cova Coalfield, Douro Carboniferous Basin, Portugal: Insights from Inorganic Geochemistry

et al. 2022

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The Douro Carboniferous Basin (DCB), aged from Gzhelian, is an important coal-bearing basin occurring in Northern Portugal. While the coals and the sedimentary sequence of the DCB have been deeply studied, the inorganic geochemical data are scarce. This study intends to provide major and trace element contents and discuss their modes of occurrence and origins using a set of twenty-four coal samples from the São Pedro da Cova Coalfield taken from different sectors/outcrops. Thus, an integrated approach using petrographic, geochemical, both organic and inorganic, and mineralogical data was used to achieve these purposes. The main results demonstrated that these coals are anthracite A and vitrinite is the main organic component. Most of the elements have inorganic affinities and are associated with aluminosilicates, while the other elements have affinities with sulfides. Illite and muscovite are the main phyllosilicates occurring in these coals and pyrite is the most common sulfide. However, cinnabar, together with phosphates (fluorapatite, monazite, xenotime and gorceixite), were also identified. The enrichment of most elements as well as a heterogenous rare earth elements (REE) distribution pattern in the tectono-sedimentary unit (TSU) samples are related to magmatic fluids. On the other hand, on the Eastern Outcrop (EO), a tectonic slice, the subparallel trend of the REE distribution patterns, and a depletion of all the elements are related to the sedimentary contribution. The occurrence of cinnabar and gorceixite epigenetic mineralizations is interpreted as the action of a porphyry intrusion identified in this area of the DCB, between the TSU B1 and TSU D1.

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Section: Geochemical Affinities Of the Trace Elementsmentioning

confidence: 92%

Effects of Magmatic Fluids in Coals of São Pedro da Cova Coalfield, Douro Carboniferous Basin, Portugal: Insights from Inorganic Geochemistry

et al. 2022

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“…The Au and Ag contents of pyrite are up to 0.11 and 0.04 wt.%, respectively. Couto and Sodré Borges, 2005). Geological map of the Terramonte area (modified from Marsella, 1966).…”

Section: Mineralogical and Chemical Characteristics Of Ore Minerals Omentioning

confidence: 99%

“…In the Terramonte area, the SGC is represented by two lithological associations that belong to a thick flyschoïd sequence (Medeiros, 1964;Marsella, 1966;Thadeu, 1977;Couto and Sodré Borges, 2005) (Fig. 2b).…”

Section: Introductionmentioning

confidence: 99%

Metallogenesis at the Terramonte Pb–Zn–Ag quartz vein, Portugal: Geological, mineralogical and geochemical evidences

Neiva

Moura

Carvalho

2015

Ore Geology Reviews

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“…The exploitation of Sb hit its peak in the 19 th century, but in the first years of the 20 th century, the competition with the Asiatic Countries led to the closure of the Portuguese Sb mines. During the Second World War, there was an increase in mining activity, and since the 1960s some prospecting campaigns and reconnaissance studies were executed [17]. Nowadays the mining structures are abandoned (Figure 2) and many waste piles and tailings remain in the zone.…”

Section: Study Areamentioning

confidence: 99%

Convolutional Neural Networks Applied to Antimony Quantification via Reflectance Spectroscopy Using Soils from Northern Portugal: Opportunities and Challenges

Carvalho,

Cardoso-Fernandes,

Lima

et al. 2024

Preprint

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Antimony (Sb) has gained significance as a critical raw material (CRM) within the European Union (EU) due to its strategic importance in various industrial sectors, particularly in the textile industry for flame retardants and as a component of Sb-based semiconductor materials. Moreover, Sb is emerging as a potential alternative for anodes used in lithium-ion batteries, a key element in the Energy transition. This study focused on exploring the feasibility of identifying and quantifying Sb mineralizations through the spectral signature of soils using reflectance spectroscopy, a non-invasive remote sensing technique, and by employing deep learning algorithms such as Convolutional Neural Networks (CNNs). Common signal preprocessing techniques were applied to the spectral data, and the soils were analyzed by Inductively Coupled Plasma Mass Spectrometry (ICP-MS). Despite achieving high R-squared values, the study faces a significant challenge of generalization of the model to new data. Despite the limitations, this study provides valuable insights into potential strategies for future research in this field.

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Stratiform Sb and Au mineralizations in the Hercynian Dúrico-Beirã area (North Portugal)

Cited by 5 publications

References 2 publications

Effects of Magmatic Fluids in Coals of São Pedro da Cova Coalfield, Douro Carboniferous Basin, Portugal: Insights from Inorganic Geochemistry

Effects of Magmatic Fluids in Coals of São Pedro da Cova Coalfield, Douro Carboniferous Basin, Portugal: Insights from Inorganic Geochemistry

Metallogenesis at the Terramonte Pb–Zn–Ag quartz vein, Portugal: Geological, mineralogical and geochemical evidences

Convolutional Neural Networks Applied to Antimony Quantification via Reflectance Spectroscopy Using Soils from Northern Portugal: Opportunities and Challenges

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