Topaz, a Potential Volatile-Carrier in Cold Subduction Zone: Constraint from Synchrotron X-ray Diffraction and Raman Spectroscopy at High Temperature and High Pressure
- Chinese Academy of Sciences (CAS), Guiyang (China); Univ. of Chinese Academy of Sciences, Beijing (China)
- Univ. of Hawaii at Manoa, Honolulu, HI (United States)
- Zhejiang Geological Prospecting Inst. of China Chemical Geology and Mine Bureau, Hangzhou (China)
- Chinese Academy of Sciences (CAS), Guiyang (China); Univ. of Chinese Academy of Sciences, Beijing (China); Guizhou Polytechnic of Construction, Guiyang (China)
- Chinese Academy of Sciences (CAS), Guiyang (China); Univ. of Chinese Academy of Sciences, Beijing (China); Bureau of Natural Resources and Planning of Yongzhou (China)
- Chinese Academy of Sciences (CAS), Guiyang (China)
- Univ. of Chinese Academy of Sciences, Beijing (China)
The equation of state and stability of topaz at high-pressure/high-temperature conditions have been investigated by in situ synchrotron X-ray diffraction (XRD) and Raman spectroscopy in this study. No phase transition occurs on topaz over the experimental pressure–temperature ($P-T$) range. The pressure–volume data were fitted by the third-order Birch–Murnaghan equation of state (EoS) with the zero-pressure unit–cell volume V0 = 343.86 (9) Å3, the zero-pressure bulk modulus K0 = 172 (3) GPa, and its pressure derivative K’0 = 1.3 (4), while the obtained K0 = 155 (2) GPa when fixed K’0 = 4. In the pressure range of 0–24.4 GPa, the vibration modes of in-plane bending OH-groups for topaz show non-linear changes with the increase in pressure, while the other vibration modes show linear changes. Moreover, the temperature–volume data were fitted by Fei’s thermal equation with the thermal expansion coefficient α300 = 1.9 (1) × 10–5 K–1 at 300 K. Finally, the $P-T$ stability of topaz was studied by a synchrotron-based single-crystal XRD at simultaneously high $P-T$ conditions up to ~10.9 GPa and 700 K, which shows that topaz may maintain a metastable state at depths above 370 km in the upper mantle along the coldest subducting slab geotherm. Thus, topaz may be a potential volatile-carrier in the cold subduction zone. It can carry hydrogen and fluorine elements into the deep upper mantle and further affect the geochemical behavior of the upper mantle.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- Chinese Academy of Sciences (CAS); National Natural Science Foundation of China (NSFC)
- OSTI ID:
- 1659305
- Journal Information:
- Minerals, Journal Name: Minerals Journal Issue: 9 Vol. 10; ISSN 2075-163X
- Publisher:
- MDPICopyright Statement
- Country of Publication:
- United States
- Language:
- ENGLISH
Similar Records
Isosymmetric pressure-induced bonding increase changes compression behavior of clinopyroxenes across jadeite-aegirine solid solution in subduction zones
Implications of Sound Velocities of Natural Topaz on the Seismic L–Discontinuity
Journal Article
·
Tue Nov 22 19:00:00 EST 2016
· Journal of Geophysical Research. Solid Earth
·
OSTI ID:1355027
Implications of Sound Velocities of Natural Topaz on the Seismic L–Discontinuity
Journal Article
·
Sun Jan 09 19:00:00 EST 2022
· Geophysical Research Letters
·
OSTI ID:1963553