Density of NaAlSi2O6 Melt at High Pressure and Temperature Measured by In-Situ X-ray Microtomography
- Case Western Reserve Univ., Cleveland, OH (United States)
- Southern Univ. of Science and Technology, Shenzhen (China)
- Univ. of Chicago, IL (United States)
In this study, the volumetric compression of jadeite (NaAlSi2O6) melt at high pressures was determined by three-dimensional volume imaging using the synchrotron-based X-ray microtomography technique in a rotation-anvil device. Combined with the sample mass, measured using a high-precision analytical balance prior to the high-pressure experiment, the density of jadeite melt was obtained at high pressures and high temperatures up to 4.8 GPa and 1955 K. The density data were fitted to a third-order Birch-Murnaghan equation of state, resulting in a best-fit isothermal bulk modulus KT0 of $10.8$ $$^{+1.9}_{–5.3}$$ GPa and its pressure derivative K'T0 of $3.4$ $$^{+6.6}_{–0.4}$$. Comparison with data for silicate melts of various compositions from the literature shows that alkali-rich, polymerized melts are generally more compressible than alkali-poor, depolymerized ones. The high compressibility of jadeite melt at high pressures implies that polymerized sodium aluminosilicate melts, if generated by low-degree partial melting of mantle peridotite at ~250–400 km depth in the deep upper mantle, are likely denser than surrounding mantle materials, and thus gravitationally stable.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- National Natural Science Foundation of China; National Science Foundation; USDOE Office of Science (SC)
- Grant/Contract Number:
- AC02-06CH11357; FG02-94ER14466
- OSTI ID:
- 1604212
- Journal Information:
- Minerals, Journal Name: Minerals Journal Issue: 2 Vol. 10; ISSN MBSIBI; ISSN 2075-163X
- Publisher:
- MDPICopyright Statement
- Country of Publication:
- United States
- Language:
- ENGLISH
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