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Title: Single crystal elasticity of natural topaz at high-temperatures

Journal Article · · Scientific Reports
ORCiD logo [1];  [1];  [1];  [2];  [3]; ORCiD logo [4];  [1];  [1]
  1. Florida State Univ., Tallahassee, FL (United States). Dept. of Earth, Ocean and Atmospheric Sciences, Earth Materials Lab.
  2. German Research Center for Geosciences (GFZ), Potsdam (Germany)
  3. Univ. Clermont Auvergene (France). Lab. Magmas et Volcans
  4. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
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Topaz is an aluminosilicate mineral phase stable in the hydrothermally altered pegmatitic rocks and also in subducted sedimentary lithologies. In nature, topaz often exhibits solid solution between fluorine and hydrous end members. We investigated elasticity of naturally occurring single crystal topaz (Al2SiO4F1.42(OH)0.58) using Resonant Ultrasound Spectroscopy. We also explored the temperature dependence of the full elastic constant tensor. We find that among the various minerals stable in the Al2O3-SiO2-H2O ternary system, topaz exhibits moderate elastic anisotropy. As a function of temperature, the sound velocity of topaz decreases with \(\frac{{\boldsymbol{d}}{{\boldsymbol{V}}}_{{\boldsymbol{P}}}}{{\boldsymbol{d}}{\boldsymbol{T}}}\) and \(\frac{{\boldsymbol{d}}{{\boldsymbol{V}}}_{{\boldsymbol{S}}}}{{\boldsymbol{d}}{\boldsymbol{T}}}\) being –3.10 and –2.30 × 10–4 km/s/K. The elasticity and sound velocity of topaz also vary as a function of OH and F content. The effect of composition (\({{\boldsymbol{x}}}_{{\boldsymbol{O}}{\boldsymbol{H}}}\)) on the velocity is equally important as that of the effect of temperature. We also note that the Debye temperature (\({{\boldsymbol{\Theta }}}_{{\boldsymbol{D}}}\)) of topaz at room temperature condition is 910 K and decreases at higher temperature. The Debye temperature shows positive correlation with density of the mineral phases in the Al2O3-SiO2-H2O ternary system.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF); Young Scholars Program; State of Florida; European Regional Development Fund (ERDF)
Grant/Contract Number:
89233218CNA000001; EAR-1634422
OSTI ID:
1624370
Journal Information:
Scientific Reports, Vol. 8, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

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