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O depĆ³sito de areias feldspĆ”ticas de Casal do Frade (Arganil), Portugal
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Advisor(s)
Abstract(s)
Resumo: Apesar do feldspato ser um dos minerais mais abundantes na crosta
terrestre, apenas um pequeno nĆŗmero de depĆ³sitos Ć© apropriado para exploraĆ§Ć£o.
Portugal Ʃ deficitƔrio em feldspato, importando cerca de 40% do feldspato
consumido. Neste trabalho estudaram-se as areias feldspĆ”ticas de depĆ³sito
de Casal do Frade, freguesia de Pombeiro da Beira, concelho de Arganil. As
amostras estudadas apresentam pequena variabilidade granulomƩtrica e os
seguintes minerais leves: quartzo hialino, quartzo leitoso, feldspato e partĆculas mistas de quartzo e feldspato. O principal mineral argiloso Ć© a esmectite.
O teor de minerais densos(essencialmente turmalina e ilmenite) Ć© muito baixo
(0,037%). Quer o quartzo, quer o feldspato encontrados e analisados, nĆ£o
apresentam na sua grande maioria a presenƧa de Ć³xidos de ferro, o que faz
crer que tem qualidade suficiente para ser utilizado como uma areia quartzofeldspĆ”tica de qualidade para a indĆŗstria cerĆ¢mica e do vidro.
Areias, feldspato, quartzo, aplicaĆ§Ć£o cerĆ¢mica.
Abstract: Although feldspar is one of the most abundant minerals in the Earth's crust, and may occur in many geological environments, only a small number of deposits are suitable for exploitation. Quality feldspar resources are scarce in Portugal and about 40% of the consumed feldspar is imported. With the present work we intend to study the feldspathic sands of Casal do Frade deposit (Pombeiro da Beira, municipality of Arganil). The studied samples present small particle size variation with the following light minerals: quartz, feldspar and mixed particles of quartz and feldspar. The main clay mineral identified is smectite. The heavy mineral content is very small (0.037%) and the main dense minerals are tourmaline and ilmenite. Both the quartz and feldspar analyzed do not exhibit the presence of iron oxides, which suggests that it is of adequate quality to be used as a feldspar quartz sand for the ceramic and glass industries.
Abstract: Although feldspar is one of the most abundant minerals in the Earth's crust, and may occur in many geological environments, only a small number of deposits are suitable for exploitation. Quality feldspar resources are scarce in Portugal and about 40% of the consumed feldspar is imported. With the present work we intend to study the feldspathic sands of Casal do Frade deposit (Pombeiro da Beira, municipality of Arganil). The studied samples present small particle size variation with the following light minerals: quartz, feldspar and mixed particles of quartz and feldspar. The main clay mineral identified is smectite. The heavy mineral content is very small (0.037%) and the main dense minerals are tourmaline and ilmenite. Both the quartz and feldspar analyzed do not exhibit the presence of iron oxides, which suggests that it is of adequate quality to be used as a feldspar quartz sand for the ceramic and glass industries.
Description
Keywords
Areias Feldspato Quartzo AplicaĆ§Ć£o cerĆ¢mica Sand Feldspar Quartz Ceramic use
Citation
Antunes et al. 2020, āO depĆ³sito de areias feldspĆ”ticas de Casal do Frade (Arganil), Portugalā, ComunicaƧƵes GeolĆ³gicas, vol. 107, nĀŗ 1 (especial), pp. 69-71. https://doi.org/10.34637/seyp-p693
Publisher
LNEG - LaboratĆ³rio Nacional de Energia e Geologia