Single crystal elasticity of natural topaz at high-temperatures
Journal Article
·
· Scientific Reports
- Florida State Univ., Tallahassee, FL (United States). Dept. of Earth, Ocean and Atmospheric Sciences, Earth Materials Lab.; DOE/OSTI
- Florida State Univ., Tallahassee, FL (United States). Dept. of Earth, Ocean and Atmospheric Sciences, Earth Materials Lab.
- German Research Center for Geosciences (GFZ), Potsdam (Germany)
- Univ. Clermont Auvergene (France). Lab. Magmas et Volcans
- Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
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:
- European Regional Development Fund (ERDF); National Science Foundation (NSF); State of Florida; USDOE Office of Science (SC); Young Scholars Program
- Grant/Contract Number:
- 89233218CNA000001
- OSTI ID:
- 1624370
- Journal Information:
- Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 8; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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