Quartz eyes from the two porphyry deposits Rio Blanco (Chile) and Climax (USA) were studied by hyperspectral cathodoluminescence (CL) mapping, electron probe microanalysis (EPMA), and Fourier transform infra-red (FTIR) microspectroscopy. Deconvolution of the CL spectra revealed three peaks responsible for the total CL emission at energies of 1.93 eV, 2.05 eV and 2.72 eV. The first two peaks are assigned to non-bridging oxygen hole centres and oxygen vacancies, respectively. The 2.72 eV peak is attributed to the alkali compensated paramagnetic [TiO4/M+] centre with M being Li+ or Na+. Its emission intensity shows a linear correlation with the Ti concentration determined in EPMA point measurements. In addition, a negative correlation between the 1.93 eV emission and the Al concentration is observed by CL-EPMA and confirmed by FTIR.

Item Type:	Conference Edited
Keywords:	Cathodoluminescence, Quartz
Research Division:	Chemical Sciences
Research Group:	Physical Chemistry (incl. Structural)
Research Field:	Structural Chemistry and Spectroscopy
Objective Division:	Expanding Knowledge
Objective Group:	Expanding Knowledge
Objective Field:	Expanding Knowledge in the Earth Sciences
Author:	Goemann, K (Dr Karsten Goemann)
Author:	Vasyukova, O (Miss Olga Vasyukova)
Author:	Kamenetsky, VS (Professor Vadim Kamenetsky)
ID Code:	78377
Year Published:	2012
Deposited By:	Central Science Laboratory
Deposited On:	2012-06-25
Last Modified:	2012-06-25
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