DI-UMONS : Dépôt institutionnel de l’université de Mons

Recherche transversale
Rechercher
(titres de publication, de périodique et noms de colloque inclus)
2014-10-30 - Colloque/Présentation - poster - Anglais - 1 page(s)

Baele Jean-Marc , "Application of cathodoluminescence total and spectral imaging to ore geology" in 24th Earth Sciences Meeting, 27-31 October, Pau, France, 2014

  • Codes CREF : Géologie et minéralogie (DI1410), Sédimentologie (DI1415), Stratigraphie (DI1414)
  • Unités de recherche UMONS : Géologie fondamentale et appliquée (F401)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)

Abstract(s) :

(Anglais) Cathodoluminescence (CL) is a powerful technique for studying ores and associated rocks in combination with classical techniques. This contribution illustrates the use of CL in ore geology through a few case studies. Total CL imaging is efficient in revealing minerals that may difficult to observe in thin-sections such as fluorite, apatite, monazite and xenotime, especially in fine-grained rocks. The CL color and emission peaks allow to evaluate the characteristics of these minerals in terms of trace-elements composition in diverse ore categories such as shales (diagenetic), oolithic ironstones, carbonatites and fenites, sedimentary exhalative, placers). In addition, irradiation haloes induced in quartz are useful to quickly detect rare earth phosphates and uraniferous apatite in quartz-bearing rocks. Spectral imaging of rare earth element activating the CL in these minerals provide further discrimination capability. Other field applications of CL lie in the investigation of quartz and feldspar, which exhibits different emission color in various geological environment and may serve as indicators for these environments. A lot of work, though, is still needed to validate and refine them.