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

Xu, Man; Jing, Zhi-Cheng; Orman, James A. Van; Yu, Tony; Wang, Yanbin

doi:10.3390/min10020161

Cited by 6 publications

(5 citation statements)

References 66 publications

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“…It is particularly challenging to experimentally measure the density of silicate melts at the pressures and temperatures of Earth's deep mantle (Sanloup, 2016; Sanloup et al., 2013; Thomas et al., 2012; Xu et al., 2020). In situ measurements using shock compression (e.g., Rigden et al., 1984), the sink‐float method in a multianvil press (e.g., Agee & Walker, 1988) and X‐ray absorption spectroscopy (e.g., Sakamaki et al., 2010) have mostly been limited to uppermost‐mantle conditions.…”

Section: Introductionmentioning

confidence: 99%

Buoyancy and Structure of Volatile‐Rich Silicate Melts

Solomatova

Caracas

2021

JGR Solid Earth

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The early Earth was marked by at least one global magma ocean. Melt buoyancy played a major role for its evolution. Here we model the composition of the magma ocean using a six-component pyrolite melt, to which we add volatiles in the form of carbon as molecular CO or CO 2 and hydrogen as molecular H 2 O or through substitution for magnesium. We compute the density relations from firstprinciples molecular dynamics simulations. We find that the addition of volatiles renders all the melts more buoyant compared to the reference volatile-free pyrolite. The effect is pressure dependent, largest at the surface, decreasing to about 20 GPa, and remaining roughly constant to 135 GPa. The increased buoyancy would have enhanced convection and turbulence, and thus promoted the chemical exchanges of the magma ocean with the early atmosphere. We determine the partial molar volume of both H 2 O and CO 2 throughout the magma ocean conditions. We find a pronounced dependence with temperature at low pressures, whereas at megabar pressures the partial molar volumes are independent of temperature. At all pressures, the polymerization of the silicate melt is strongly affected by the amount of oxygen added to the system while being only weakly affected by the specific type of volatile added.

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Section: Introductionmentioning

confidence: 99%

Buoyancy and Structure of Volatile‐Rich Silicate Melts

Solomatova

Caracas

2021

JGR Solid Earth

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“…Its density according [61] is 2300 kg/m 3 . Generally, such types of minerals possess density varies from 2200 kg/m 3 to 3005 kg/m 3 [62]. Additionally, sodium calcium sulphate hydrate (N-C-F-H, Na 0 .…”

Section: Xrd Studymentioning

confidence: 99%

Utilising Phosphogypsum and Biomass Fly Ash By-Products in Alkali-Activated Materials

Zhu,

Pranckevičienė,

Pundienė

et al. 2024

Sustainability

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Significant environmental issues are raised by the phosphogypsum (PG) waste that is being produced. In Lithuania, about 1,500,000 tons of PG waste is generated yearly, and about 300 Mt is generated yearly worldwide. A by-product of burning wood biomass in thermal power plants is biomass fly ash (BFA). By 2035, compared to 2008 levels, industrial biomass incineration for combined heat and power and, as a consequence, BFA, is expected to triple. This study revealed the possibility of using these difficult-to-utilise waste products, such as BFA and PG, in efficient alkali-activated materials (AAM). As the alkaline activator solution (AAS), less alkaline Na2CO3 solution and Na2SiO3 solution were used. The study compared the physical–mechanical properties of BFA-PG specimens mixed with water and the AAS. After 28 days of curing, the compressive strength of the BFA-PG-based, water-mixed samples increased from 3.02 to 6.38 MPa when the PG content was increased from 0 to 30 wt.%. In contrast, the compressive strength of the BFA-PG-based samples with AAS increased from 8.03 to 16.67 MPa when the PG content was increased from 0 to 30 wt.%. According to XRD analysis, gypsum crystallisation increased when the PG content in the BFA-PG-based samples with water increased. The presence of AAS in the BFA-PG-based samples significantly reduced gypsum crystallisation, but increased the crystallisation of the new phases kottenheimite and sodium aluminium silicate hydrate, which, due to the sodium ions’ participation in the reactions, created denser reaction products and improved the mechanical properties. The outcome of this investigation aids in producing sustainable AAM and applying high volume of hardly usable waste materials, such as BFA and PG.

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“…The experimental data associated with this paper are available in Table S1 of Supporting Information S1 and can also be found in Mendeley Data repository (Xu et al., 2024).…”

Section: Data Availability Statementmentioning

confidence: 99%

In Situ Determination of Thermoelastic Properties of Magnesite at High Pressure and Temperature With Implications to Seismic Detectability of Moderately Carbonated Lithologies in the Earth's Mantle

Xu,

Jing,

Van Orman

et al. 2024

JGR Solid Earth

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Subduction of carbonate‐bearing oceanic plates into Earth's interior recycles carbon from the surface to the deep mantle. The subducted carbonates can significantly affect mantle properties and dynamics. Magnesite is recognized as one of the major potential carbon hosts in the deep mantle because of its stability up to deep lower mantle conditions. However, despite many previous studies on the equation of state and elastic properties of magnesite, large discrepancies still exist for its elastic moduli and their pressure and temperature derivatives. Here we report in situ density and elastic wave velocity measurements on a natural magnesite at simultaneous high pressure‐temperature conditions up to ∼8 GPa–1073 K in a multi‐anvil apparatus using ultrasonic and synchrotron X‐ray techniques. Global fitting of the data set to finite strain equations yields KS0 = 114.0 ± 1.2 GPa, = 4.9 ± 0.3, = (−0.019 ± 0.002) GPa/K, G0 = 68.6 ± 0.4 GPa, G′ = 1.6 ± 0.1, and = (−0.018 ± 0.001) GPa/K. Compared to other major upper mantle and transition zone minerals, magnesite has intermediate VP, the lowest VS, and the lowest density. Thus, magnesite possesses higher VP/VS ratio than other mantle minerals in normal mantle regions, whereas this feature is less pronounced in subduction zone environments. Modeling of the velocity profiles of carbonated lithologies along different geotherms suggests that moderately‐enriched magnesite domains are unlikely to be detected seismically in the Earth's mantle.

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

Cited by 6 publications

References 66 publications

Buoyancy and Structure of Volatile‐Rich Silicate Melts

Buoyancy and Structure of Volatile‐Rich Silicate Melts

Utilising Phosphogypsum and Biomass Fly Ash By-Products in Alkali-Activated Materials

In Situ Determination of Thermoelastic Properties of Magnesite at High Pressure and Temperature With Implications to Seismic Detectability of Moderately Carbonated Lithologies in the Earth's Mantle

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