Tipo
Artigos em Revista
Tipo de Documento
Artigo Completo
Título
Lithium-, Phosphorus-, and Fluorine-Rich Intrusions and the Phosphate Sequence at Segura (Portugal): A Comparison with Other Hyper-Differentiated Magmas
Participantes na publicação
Michel Cathelineau (Author)
Marie-Christine Boiron (Author)
Andreï Lecomte (Author)
Ivo Martins (Author)
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA
Ícaro Dias da Silva (Author)
Dep. Geologia
IDL
Antonio Mateus (Author)
Dep. Geologia
IDL
Resumo
Near the Segura pluton, hyper-differentiated magmas enriched in F, P, and Li migrated through shallowly dipping fractures, which were sub-perpendicular to the schistosity of the host Neoproterozoic to Lower Cambrian metasedimentary series, to form two swarms of low-plunging aplite–pegmatite dykes. The high enrichment factors for the fluxing elements (F, P, and Li) compared with peraluminous granites are of the order of 1.5 to 5 and are a consequence of the extraction of low-viscosity magma from the crystallising melt. With magmatic differentiation, increased P and Li activity yielded the crystallisation of the primary amblygonite–montebrasite series and Fe-Mn phosphates. The high activity of sodium during the formation of the albite–topaz assemblage in pegmatites led to the replacement of the primary phosphates by lacroixite. The influx of external, post-magmatic, and Ca-Sr-rich hydrothermal fluids replaced the initial Li-Na phosphates with phosphates of the goyazite–crandallite series and was followed by apatite formation. Dyke emplacement in metasediments took place nearby the main injection site of the muscovite granite, which plausibly occurred during a late major compression event.
Data de Submissão/Pedido
2024-01-25
Data de Aceitação
2024-03-04
Data de Publicação
2024-03-08
Instituição
UNIVERSIDADE DE LISBOA
Suporte
Minerals
Identificadores da Publicação
ISSN - 2075-163X
Editora
MDPI AG
Identificadores do Documento
DOI -
https://doi.org/10.3390/min14030287
URL -
http://dx.doi.org/10.3390/min14030287
Identificadores de Qualidade
SCIMAGO Q2 (2021) - 522 - Geology
SCIMAGO Q2 (2021) - 522 - Geotechnical Engineering and Engineering Geology
SCOPUS Q2 (2021) - 3.7 - Geology
SCOPUS Q2 (2021) - 3.7 - Geotechnical Engineering and Engineering Geology
Web Of Science Q2 (2020) - 2.644 - GEOCHEMISTRY & GEOPHYSICS - SCIE
Web Of Science Q2 (2020) - 2.644 - MINERALOGY - SCIE
Web Of Science Q2 (2020) - 2.644 - MINING & MINERAL PROCESSING - SCIE
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