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Journal Article
Journal: Geology
Published: 24 July 2023
Geology (2023) 51 (10): 919–923.
... a rare chance to better understand early differentiation, late accretion, core-mantle interaction, and subsequent evolution of Earth’s mantle. We present new W isotope data for Archean komatiites and basalts from the Barberton (South Africa) and Suomussalmi (Finland) Greenstone Belts and Permian picrites...
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Journal Article
Published: 18 April 2023
The Seismic Record (2023) 3 (2): 96–104.
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Journal Article
Published: 01 April 2023
Russ. Geol. Geophys. (2023) 64 (4): 462–478.
..., they are represented by magnetized prisms. Such a model is valid due to the equivalence of current and magnetized objects. As there should be no real magnetization in the core, this property of a virtual prism to generate a magnetic field strength is referred to as virtual or effective magnetization (EM), which...
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Journal Article
Published: 03 October 2022
American Mineralogist (2022) 107 (10): 1878–1885.
... previous studies ( Tateno et al. 2019 ; Zurkowski et al. 2022 ). As C 37 Fe 2 S is observed to core-mantle boundary pressures and high temperatures, the C 37 Fe 2 S density profile through Earth’s outer core was determined by fitting the C 23 Fe 2 S equation of state (<120 GPa) and applying a 1.6...
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Journal Article
Published: 20 September 2022
Journal of the Geological Society (2023) 180 (1): jgs2022-022.
...Xiujuan Bao; Hanqing Zhao; Shihong Zhang; Xinlei Li; Wengang Tan; Chao Li; Huaichun Wu; Haiyan Li; Tianshui Yang Abstract Length of day (LOD) varies throughout Earth history, dictated in the long term by the retreat of the Moon and growth of Earth's core. Reconstruction of LOD in deep time has...
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Journal Article
Published: 01 July 2022
American Mineralogist (2022) 107 (7): 1249–1253.
..., C22 → C23 → C37, are similar to those of Fe 2 P, while they are not known in oxides and halogens that often adopt the C23 cotunnite-type structure. The newly found cotunnite-type Fe 2 S phase could be present in solid iron cores of planets, including Mars. * E-mail: kei@elsi.jp . Manuscript...
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Journal Article
Published: 01 July 2022
American Mineralogist (2022) 107 (7): 1254–1261.
...% at the melting temperature, a significantly larger value than that of pure Fe (~3%). Combined with the above EoS parameters and the thermal dependence reported in the literature, our data were extrapolated to the outer core conditions of the Earth. Assuming that S is the only light element and considering...
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Series: GSA Special Papers
Published: 03 May 2022
DOI: 10.1130/2021.2553(11)
EISBN: 9780813795539
...). (Top) Location of the study area (triangle) and teleseisms used (circles). White events provided P mantle phases, and green events provided PKiKP core phases. P phases from 21 regional events, not shown on the map, were also used. (Bottom) Vertical WSW (left)-to-ENE (right) section along...
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Series: GSA Special Papers
Published: 03 May 2022
DOI: 10.1130/2021.2553(12)
EISBN: 9780813795539
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Journal Article
Published: 01 April 2022
American Mineralogist (2022) 107 (4): 739–743.
... and temperatures. These results highlight the utility of applying single-crystal X-ray diffraction techniques to high P-T multigrain samples to explore the structural properties of iron-rich phases in Earth and planetary cores. While experimental and calculated results demonstrate that Fe 2 S is an important...
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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.
... permanent densification high 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...
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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
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 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
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.
... for understanding planetary interiors. To estimate the structure and composition 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...
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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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