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Open AccessArticle

Density of NaAlSi2O6 Melt at High Pressure and Temperature Measured by In-Situ X-ray Microtomography

1
Department of Earth, Environmental, and Planetary Sciences, Case Western Reserve University, Cleveland, OH 44106, USA
2
Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen 518055, China
3
Center for Advanced Radiation Sources, The University of Chicago, Chicago, IL 60637, USA
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(2), 161; https://doi.org/10.3390/min10020161
Received: 17 January 2020 / Revised: 3 February 2020 / Accepted: 10 February 2020 / Published: 12 February 2020
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 10.8-5.3+1.9 GPa and its pressure derivative KT0' of 3.4-0.4+6.6. 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.
Keywords: density; jadeite melt; equation of state; high pressure; X-ray microtomography density; jadeite melt; equation of state; high pressure; X-ray microtomography
MDPI and ACS Style

Xu, M.; Jing, Z.; Van Orman, J.A.; Yu, T.; Wang, Y. Density of NaAlSi2O6 Melt at High Pressure and Temperature Measured by In-Situ X-ray Microtomography. Minerals 2020, 10, 161.

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