Joaquim Simão, Bravo Mendoza, Madalena Ribeiro,
Key-words: Geochemical mapping; Monchique; Geochimical sampling; representativity When approaching a geochemical project a few problems of methodology have to be considered, among them the exploration grid that as to obey to representativity/rentability criteria. This preliminary study permitted to save near 27% on the sampling comparing with the net initially envisaged. Some criteria considered in the elaboration of the grade variation maps and the distribution of two elements in the area already ...
Tópico(s): Geochemistry and Geologic Mapping
1999 - | Ciências da Terra - Earth Sciences Journal
Sofia Barbosa, António Dias, Diogo Durão, José Grilo, Gonçalo Baptista, Jonhsman Cagiza, Sofia Pessanha, Joaquim Simão, José António de Almeida,
In this case study, 2D micro energy dispersive X-ray fluorescence (µ-EDXRF) surveys were performed in the nepheline syenite (NS) of “Serra de Monchique” located in the southwest region of Portugal (Algarve, Iberian Peninsula). The results allow the identification in the mineral matrix of certain elements classified as critical raw materials (CRMs). Due to substitution effects, some scarce transition elements, such as Zn and Ni, are present and camouflaged in alkali silicate minerals, while others, such ...
Tópico(s): Geochemistry and Geologic Mapping
2022 - Multidisciplinary Digital Publishing Institute | Minerals
Marta Neres, Pedro Terrinha, Susana Custódio, Sónia Silva, Joaquim Luís, J. M. Miranda,
... enigmatic NNW-SSE trending alignment of Sintra-Sines-Monchique plutons, whose significance remains to be fully understood.
Tópico(s): Geological and Geochemical Analysis
2018 - Elsevier BV | Tectonophysics
Joaquim Simão, Cristina Carvalho, Zenaide Silva, António Moura,
... Monforte, Gabro de Odivelas e Sienito Nefelínico de Monchique. Calculou-se a percentagem de decréscimo das propriedades ...
Tópico(s): Building materials and conservation
2010 - | Geotecnia