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Journal Article
Published: 01 March 2022
American Mineralogist (2022) 107 (3): 421–431.
... to the extrapolation of room temperature nuclear resonant inelastic X-ray scattering data. Our study suggests that anharmonicity may be more prevalent in Fe metal than in lower mantle minerals at 2800 K and 50 GPa, a relevant condition for the core formation, and the silicate mantle may be isotopically heavy in iron...
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Journal Article
Published: 01 March 2022
American Mineralogist (2022) 107 (3): 325–335.
... pressure X-ray diffraction neutron diffraction Physics and Chemistry of Earth’s Deep Mantle and Core It is well known that the physicochemical properties of magmas, such as density, viscosity, and elastic moduli, are sensitive to their atomic structures (e.g., Sakamaki 2018 ). Thus...
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Journal Article
Published: 01 February 2022
American Mineralogist (2022) 107 (2): 248–256.
... these results with recently reported experimental values. Finally, our calculations under the conditions of the Earth’s inner core allow us to estimate a S content of 2.7 wt% S, assuming the only components of the inner core are Fe and Fe 3 S, a linear variation of elastic properties between end-members Fe...
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Journal Article
Published: 01 December 2021
American Mineralogist (2021) 106 (12): 1950–1956.
...Anna M. Rebaza; Esther S. Posner; Marcel Thielmann; David C. Rubie; Gerd Steinle-Neumann Abstract The transport properties of liquid iron alloys at high pressure ( P ) and temperature ( T ) are essential for understanding the formation, composition, and evolution of planetary cores. Light alloying...
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Journal Article
Journal: Elements
Published: 01 December 2021
Elements (2021) 17 (6): 407–412.
... to that between different planetary bodies. Isotopic signatures arising from primordial events, namely, evaporation/condensation, core formation and melting/crystallization, may be progressively diluted, modified, and redistributed over time by global recycling processes such as plate tectonics. Here, we assess...
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Journal Article
Published: 01 November 2021
American Mineralogist (2021) 106 (11): 1744–1750.
...Siheng Wang; Nao Cai; Xintong Qi; Sibo Chen; Baosheng Li Abstract Sound velocities of iron and iron-based alloys at high pressure and high temperature are crucial for understanding the composition and structure of Earth’s and other telluric planetary cores. In this study, we performed ultrasonic...
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Journal Article
Published: 22 September 2021
Seismological Research Letters (2022) 93 (1): 376–385.
...Yulin Chen; Sidao Ni; Baolong Zhang Abstract The core mantle boundary (CMB) features the most dramatic contrast in the physical properties within the Earth and plays a fundamental role in the understanding of the dynamic evolution of the Earth’s interior. Seismic core phases such as PKKP sample...
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Journal Article
Published: 01 August 2021
American Mineralogist (2021) 106 (8): 1349–1359.
..., Fe 3 C, Fe 7 C 3 , and liquid are stable, which places constraints on the liquidus temperature of the outer core, namely inner core crystallization temperature, as the inner core would be comprised by the liquidus phase. Two possible P-T locations for the invariant point were predicted from existing...
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Journal Article
Published: 01 July 2021
American Mineralogist (2021) 106 (7): 1077–1082.
... of a planetary core, the equation of state (EoS) of Fe alloys provides indispensable information, along with planetary exploration data. The density of Fe alloys at ambient pressure is one of the most fundamental characteristics used to describe the EoS, as well as its elastic properties (bulk modulus, K , its...
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Journal Article
Published: 01 July 2021
American Mineralogist (2021) 106 (7): 1097–1104.
...Vadim S. Efimchenko; Nicolay V. Barkovskii; Vladimir K. Fedotov; Konstantin P. Meletov; Artem V. Prokoshin Abstract Hydrogen-induced decomposition of fayalite (Fe 2 SiO 4 ) at high pressure is of considerable interest for a better understanding of the chemical processes occurring in the cores...
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Journal Article
Published: 01 January 2021
Russ. Geol. Geophys. (2021) 62 (1): 25–43.
... were driven by subduction processes, whereby the crust became recycled in the mantle and the double layer (D”) formed at the core–mantle boundary. The events of the 3–2 Ga interval created prerequisites for redox changes on the surface and release of free oxygen into the atmosphere. In terms of global...
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Journal Article
Published: 01 January 2021
Russ. Geol. Geophys. (2021) 62 (1): 6–24.
... reversals, can be among the main indicators of the evolution of the geodynamo – the heat mechanism controlling the entire series of global tectonic processes. The frequency of reversals is determined by the intensity of mantle plumes that cause the cooling of the core, increase the convection rate...
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Journal Article
Published: 01 December 2020
American Mineralogist (2020) 105 (12): 1769–1777.
... ) that may transport water (OH – ) deep into the Earth's lower mantle. Additionally, the pyrite-type polymorph (space group Pa 3 of FeOOH), and its potential dehydration have been linked to phenomena as diverse as the introduction of hydrogen into the outer core ( Nishi et al. 2017 ), the formation...
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Journal Article
Published: 01 December 2020
Russ. Geol. Geophys. (2020) 61 (12): 1345–1353.
...N.E. Sagatov; P.N. Gavryushkin; I.V. Medrish; T.M. Inerbaev; K.D. Litasov Abstract —Based on first-principle calculations in the framework of the density functional theory and structure prediction algorithms, we have determined iron carbide phases stable at the Earth’s core pressures...
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Journal Article
Published: 01 November 2020
American Mineralogist (2020) 105 (11): 1752–1755.
... to be stable, at least to 83 GPa at high temperature. The Birch-Murnaghan equation of state for C37 Fe 2 P was also obtained from pressure-volume data, suggesting that phosphorous contributes to 17% of the observed density deficit of the Earth's outer core when it includes the maximum 1.8 wt% P as observed...
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Journal Article
Published: 01 September 2020
American Mineralogist (2020) 105 (9): 1349–1354.
...Jie Fu; Lingzhi Cao; Xiangmei Duan; Anatoly B. Belonoshko Abstract Pressure-temperature-volume ( P-T-V ) data on liquid iron-sulfur (Fe-S) alloys at the Earth's outer core conditions (~136 to 330 GPa, ~4000 to 7000 K) have been obtained by first-principles molecular dynamics simulations. We...
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Journal Article
Published: 01 July 2020
American Mineralogist (2020) 105 (7): 1069–1077.
... and upper bounds of thermal conductivity were calculated. For all Ni-bearing alloys, thermal conductivity estimates range between ~12 and 20 W/(m⋅K) over the considered pressure and temperature ranges. Adiabatic heat fluxes were computed for both Ganymede's core and the Lunar core, and heat flux values...
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Journal Article
Published: 01 June 2020
American Mineralogist (2020) 105 (6): 917–921.
... structure at the P-T conditions of the Earth's core, rather than in the double-hexagonal close packed (dhcp) structure as previously reported. We compared the experimentally determined unit-cell volumes of FeH with those from ab initio calculations. Additionally, we observed a change in compressibility...
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Journal Article
Journal: Elements
Published: 01 June 2020
Elements (2020) 16 (3): 161–166.
...; later larger bodies had formed cores and mantles with distinct properties. In addition, there may have been an overall trend of early reduced and later oxidized material accreting to form the Earth. This paper provides an overview—based on natural materials in our Earthbound sample collections...
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Journal Article
Journal: Elements
Published: 01 June 2020
Elements (2020) 16 (3): 167–172.
.... 2020 this issue) led to oxygen redistribution, resulting in a stratification of oxidation state by sinking of reduced iron (Fe 0 ) metal into the core and bonding of O 2− to mantle silicates, followed by outgassing of H 2 O-vapor, CO 2 , and CO into the atmosphere ( F ig . 1 ). The Earth’s early...
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