Cathodoluminescence (CL) spectroscopy: Distinction of generations of quartz based on its emission spectrum [Espetroscopia de catodoluminescência (CL): Distinção de gerações de quartzos com base no espetro de emissão]

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Santos, A (Author) Other; Couto, H (Author) FCUP; Sa, C (Author) Other

Journal

Title: Comunicações Geológicas

Vol. 101

Pages: 191-194

ISSN: 0873-948X

Publisher: LNEG - Laboratório Nacional de Energia e Geologia

Indexing

ISI Web of Knowledge

Scopus - 0 Citations

Scientific classification

FOS: Natural sciences

Other information

Authenticus ID: P-00G-4ZV

Abstract (EN): The lattice defects causing different CL emissions in quartz often reveal the specific physicochemical conditions of crystal growth, providing a signature of genetic conditions of mineral formation. The cathodoluminescence spectroscopy was applied to some samples of quartz from Durico-Beirão gold-antimony district, Panasqueira mine, Migmatitic Belt of the NW coast of Portugal, a sample of Porto's Granite and a quartz crystal from granitic pegmatite from Companheiro (Penalva do Castelo). The aim of this work was to distinguish quartz generations based on their Cathodoluminescence (CL) emission spectra and to demonstrate and control the operability of the spectrometer (SP2300i and a CCD Pixis 400B) coupled to the equipment HC3-LM belonging to the Center of Geology of the University of Porto. In general, hydrothermal quartz have three emission bands around 1.91, 2.5 and 2.8 eV. Igneous quartz presents more complex spectra with less prominent bands, which are difficult to identify by visual inspection. However four emission bands were determined around 1.8, 2.2, 2.5 and 2.8 eV by Gaussian modeling. Nevertheless the emission bands in igneous quartz were not exactly what was expected for this quartz type. It was possible to distinguish them from the hydrothermal quartz as these had their own CL emission spectra, with a particular behavior, a transient emission band around 2.5 eV. This accords to published data. © 2014 LNEG ¿ Laboratório Nacional de Geologia e Energia IP.

Language: English

Type (Professor's evaluation): Scientific