Distinction between magmatic and hydrothermal signatures in apatites from north Portugal: cathodoluminescence, SEM and electron microprobe study [Recherche de signatures magmatique et hydrothermale dans des apatites du nord du Portugal: etude par cathodoluminescence, microscopie electronique a balayage et microsonde electronique]

• Tipo: Artigo em Revista Científica Internacional
• Data: 1994

Autores

Blanc, P (Autor) Outra; Roger, G (Autor) Outra; Couto, H (Autor) FCUP; Helena Couto (Autor) FCUP

Revista

Título: BULLETIN DE LA SOCIETE GEOLOGIQUE DE FRANCE

ISSN: 0037-9409

Editora: SOC GEOL FRANCE

Indexação

ISI Web of Knowledge

Scopus - 7 Citações

Classificação Científica

CORDIS: Ciências Naturais

FOS: Ciências exactas e naturais

Outras Informações

ID Authenticus: P-00A-2P2

Abstract (EN): SEM, EPMA and CL were performed for the study of fluorapatite crystals from samples collected in northwestern Portugal: in syn- to late-tectonic Hercynian granites, in one Sn-bearing aplite-pegmatite vein, and in two Sb-Au bearing quartz veins. Two types of CL spectra are distinguished: 1) apatite with a strong yellow luminescence; 2) apatite with a weak pink-yellow to pale violet luminescence. EPMA reveal two different chemical signatures: apatites characterized by high grades in Mn (MnO ¿7.3%), Fe and Sr, and by the presence of La and Ce, corresponding to type 1 spectra; apatites with very low Mn and Fe concentrations, weak Sr-concentrations, higher Y and Si contents, and the presence of Nd, Sm and Gd. "Magmatic' signature is mainly characterized by high concentrations of Mn, Fe and Sr in apatite of type 1, and "hydrothermal' signature by high contents in Y and Si in apatite of type 2. There is an extended English abstract. -from English summary

Idioma: Inglês

Tipo (Avaliação Docente): Científica