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]

• Type: Article in International Scientific Journal
• Date: 1994

Authors

Blanc, P (Author) Other; Roger, G (Author) Other; Couto, H (Author) FCUP; Helena Couto (Author) FCUP

Journal

Title: BULLETIN DE LA SOCIETE GEOLOGIQUE DE FRANCE

ISSN: 0037-9409

Publisher: SOC GEOL FRANCE

Indexing

ISI Web of Knowledge

Scopus - 7 Citations

Scientific classification

CORDIS: Natural sciences

FOS: Natural sciences

Other information

Authenticus ID: 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

Language: English

Type (Professor's evaluation): Scientific