DBPapers
10.5593/SGEM2014/B13/S4.106

CATHODOLUMINESCENCE APPLIED TO THE STUDY OF APATITES RELATED TO GOLD AND ANTIMONY DEPOSITS OF NORTHWESTERN PORTUGAL

H. Couto
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-09-4 / ISSN 1314-2704, June 19-25, 2014, Book 1, Vol. 3, 831-838 pp

ABSTRACT
The Cathodoluminescence (CL) has proved to be an important tool in geological research with a varied spectrum of applications (mineralogy, gemmology, mineral deposits, crustal processes, petrology, geochronology, structural geology, hydrogeology and environmental studies). CL studies are fundamental to correctly apply other current analytical methods as Scanning Electron Microprobe (SEM) and Electron Microprobe Analysis (EPMA). CL is particularly important in the study of the distribution of certain trace elements (e.g. rare earth elements) also contributing to the knowledge of mineral genesis. Apatite was one of the first minerals to be studied in CL and one of the most studied. This fact is related with the great willingness of this mineral to emit CL. Apatite is an ubiquitous mineral occurring in different environments and contain abundant rare earths elements, becoming favourable to the study of processes involving the genesis of rocks. CL, SEM and EPMA were applied to different samples of apatite of northwestern Portugal, giving continuity to previous studies. The analyzed samples were related with gold and antimony mineralizations of the Dúrico-Beirão mining district located in northwestern Portugal. Apatites from Cambrian and Lower Ordovician metasediments and from albitized felsic igneous rocks were studied by cathodoluminescence imaging and spectroscopy complemented with EPMA allowing the characterization of geochemical signatures of the different generations of apatite.

Keywords: apatite, cathodoluminescence, gold, metassediments, albitized felsic igneous rocks

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