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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 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 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.
... et al. 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...
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Journal Article
Published: 01 May 2020
Russ. Geol. Geophys. (2020) 61 (5-6): 495–501.
... at the international conference on large igneous provinces (LIP-19, September 2019, Tomsk) co-chaired by R. Ernst, V. Yarmoluk, and N. Dobretsov. New seismic tomography images of the D 2 layer ( Dobretsov, 2020 and references therein) reveal plumes that are rooted at the core-mantle boundary and have surface...
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Journal Article
Published: 01 May 2020
Russ. Geol. Geophys. (2020) 61 (5-6): 502–526.
.... Sobolev IGM, Siberian Branch of the RAS 2020 V.S. Sobolev IGM, Siberian Branch of the RAS Plate tectonics plume tectonics seismic tomography gravity field lower mantle core models of lower mantle plumes plume magmatism compression extension 1. General correlation between plate...
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Journal Article
Published: 01 March 2020
American Mineralogist (2020) 105 (3): 319–324.
... homogenization of the Earth's inner core and those of small terrestrial planets and large satellites. The obtained diffusion coefficients D were fitted to the equation D = D 0 exp[−( E * + PV *)/(R T )], where D 0 is a constant, E * is the activation energy, P is the pressure, V * is the activation volume, R...
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Journal Article
Journal: Geology
Published: 27 February 2020
Geology (2020) 48 (5): 473–477.
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Journal Article
Published: 15 January 2020
Seismological Research Letters (2020) 91 (3): 1377–1383.
... in the data collection process. Using Oldham’s data for the discovery of Earth’s core as a case study, we illustrate how a hierarchical Bayesian model selection methodology using leave‐one‐out cross validation can robustly and efficiently answer quantitative questions using even poor‐quality geophysical data...
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Journal Article
Published: 01 January 2020
American Mineralogist (2020) 105 (1): 28–34.
...Marie Edmonds; Benjamin Tutolo; Kayla Iacovino; Yves Moussallam Abstract Much of Earth's carbon resides in the “deep” realms of our planet: sediments, crust, mantle, and core. The interaction of these deep reservoirs of carbon with the surface reservoir (atmosphere and oceans) leads to a habitable...
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Journal Article
Published: 01 January 2020
American Mineralogist (2020) 105 (1): 22–27.
... manifestations on Earth's surface, yet they have played a critical role in the evolution of our planet. The metal-silicate partitioning reaction promoted carbon capture during Earth's accretion and may have sequestered substantial carbon in Earth's core. The freezing reaction involving iron-carbon liquid could...
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Journal Article
Published: 01 December 2019
American Mineralogist (2019) 104 (12): 1781–1787.
... be the most nitrogen-rich iron compound under core conditions. An iron carbonitride Fe 7 (C,N) 3 found as a mantle-derived diamond inclusion implies that β-Fe 7 N 3 and Fe 7 C 3 may form a continuous solid solution in the mantle deeper than 1000 km depth. Diamond formation may be related to the presence...
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Journal Article
Published: 01 December 2019
American Mineralogist (2019) 104 (12): 1857–1865.
... affinity of N and C: it increases in nitrogen but decreases in carbon. The reduction of C solubility in a Fe-rich melt containing nitrogen and sulfur may have had important consequences in the case of imperfect equilibration between the core and the mantle during their separation in the early Earth history...
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Journal Article
Published: 01 December 2019
American Mineralogist (2019) 104 (12): 1701–1731.
... 2019 High pressure deep Earth crystallography mineral physics The pressure in Earth ranges from atmospheric to 136 GPa at the core-mantle boundary, and further, to 360 GPa in the center of the Earth ( Dziewonski and Anderson 1981 ). These gravitationally generated pressures...
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Journal Article
Published: 01 November 2019
American Mineralogist (2019) 104 (11): 1663–1672.
... of crust and core materials, possibly derived from the same planetesimal parent body, and lacking an intervening mantle component. Mesosiderites have experienced an extremely slow cooling rate from ca. 550 °C, as recorded in the metal (0.25–0.5 °C/Ma). Here we present a detailed investigation of exsolution...
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Journal Article
Published: 01 November 2019
American Mineralogist (2019) 104 (11): 1603–1607.
... in the Fe-FeO system based on textural and chemical characterizations of recovered samples. Liquid-liquid immiscibility was observed up to 29 GPa. Oxygen concentration in eutectic liquid increased from >8 wt% O at 44 GPa to 13 wt% at 204 GPa and is extrapolated to be about 15 wt% at the inner core...
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