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

    247538.pdf (733.8Kb)
    Access Status
    Open access
    Authors
    Agangi, Andrea
    Gucsik, A.
    Nishido, H.
    Ninagawa, K.
    Kamenetsky, V.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Agangi, A. and Gucsik, A. and Nishido, H. and Ninagawa, K. and Kamenetsky, V. 2016. Relation between cathodoluminescence and trace-element distribution of magmatic topaz from the Ary-Bulak massif, Russia. Mineralogical Magazine. 80 (5): pp. 881-899.
    Source Title
    Mineralogical Magazine
    DOI
    10.1180/minmag.2016.080.023
    ISSN
    1471-8022
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/9054
    Collection
    • Curtin Research Publications
    Abstract

    In order to define the cathodoluminescence (CL) properties of magmatic topaz and its relation with traceelement 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 CLbright 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.

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