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Relation between cathodoluminescence and trace-element distribution of magmatic topaz from the Ary-Bulak massif, Russia

Citation

Agangi, A and Gucsik, A and Nishido, H and Ninagawa, K and Kamenetsky, VS, Relation between cathodoluminescence and trace-element distribution of magmatic topaz from the Ary-Bulak massif, Russia, Mineralogical Magazine, 80, (5) pp. 881-899. ISSN 0026-461X (2016) [Refereed Article]

Copyright Statement

Copyright 2016 The Mineralogical Society

DOI: doi:10.1180/minmag.2016.080.023

Abstract

In order to define the cathodoluminescence (CL) properties of magmatic topaz and its relation with trace-element composition, we studied topaz phenocrysts from the Ary-Bulak ongonite massif, Russia using a wide array of analytical techniques. Scanning electron microscopy CL panchromatic images reveal strong variations, which define micrometre-scale euhedral growth textures. Several truncations of these growth textures occur in single grains implying multiple growth and resorption events. The CL spectra of both CL-bright and -dark domains have a major peak in the near-ultraviolet centred at 393 nm. Cathodoluminescence images taken after several minutes of electron bombardment show decreasing emission intensity. Electron microprobe analyses indicate high F concentrations (average OH/(OH + F) = 0.04 calculated by difference, 100 wt.% – total from electron probe microanalyses), consistent with what has been found previously in topaz-bearing granites, and the OH stretching vibration (∼3653 cm−1) was detected in Raman spectra. Laser ablation inductively-coupled plasma mass spectrometry traverses performed across the CL textures detected trace elements at ppm to thousands of ppm levels, including: Fe, Mn, Li, Be, B, P, Nb, Ta, W, Ti, Ga, light rare-earth elements, Th and U. Lithium, W, Nb and Ta appear to be correlated with CL intensity, suggesting a role for some of these elements in the activation of CL in topaz. In contrast, no clear correlation was found between CL intensity and F contents, despite the fact that the replacement of OH for F is known to affect the cell parameters of topaz.

Item Details

Item Type:Refereed Article
Keywords:topaz, fluorine, lithium, ongonite, cathodoluminescence, Raman, rare metals
Research Division:Earth Sciences
Research Group:Geology
Research Field:Mineralogy and Crystallography
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Other Mineral Resources (excl. Energy Resources)
Objective Field:Mineral Resources (excl. Energy Resources) not elsewhere classified
Author:Kamenetsky, VS (Professor Vadim Kamenetsky)
ID Code:114513
Year Published:2016
Web of Science® Times Cited:1
Deposited By:Earth Sciences
Deposited On:2017-02-17
Last Modified:2017-05-16
Downloads:0

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