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

Journal Article · · Minerals
DOI:https://doi.org/10.3390/min10020161· OSTI ID:1604212

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 Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF); National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
AC02-06CH11357; EAR-1619964; 1620548; 41974098; EAR-1634415; FG02-94ER14466
OSTI ID:
1604212
Journal Information:
Minerals, Vol. 10, Issue 2; ISSN 2075-163X
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

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