...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...

... 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...

... 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...

... 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...

... of America 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...

... 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...

... 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...

...Louise H. Kellogg; Harsha Lokavarapu; Donald L. Turcotte Abstract There are three major reservoirs for carbon in the Earth at the present time, the core, the mantle, and the continental crust. The carbon in the continental crust is mainly in carbonates (limestones, marbles, etc.). In this paper we...

... available to all readers online. Solubility behavior δ-AlOOH ε-FeOOH high pressures Physics and Chemistry of Earth's Deep Mantle and Core The oxyhydroxides goethite (α-FeOOH) and AlOOH are common hydrous minerals in the sediments. δ-AlOOH is a high-pressure polymorph of diaspore (α-AlOOH...

... to determine. During Earth's differentiation, carbon was partitioned into the core, mantle, crust, and atmosphere. Therefore, although carbon is omnipresent within the Earth system, scientists have yet to determine its distribution and relative abundances. This article addresses what we know of the processes...

...Feng Zhu; Jie Li; David Walker; Jiachao Liu; Xiaojing Lai; Dongzhou Zhang Abstract The Eckstrom-Adcock iron carbide, nominally Fe 7 C 3 , is a potential host of reduced carbon in Earth's mantle and a candidate component of the inner core. Non-stoichiometry in Fe 7 C 3 has been observed previously...

...Steven A. Hauck; Catherine L. Johnson NASA's MESSENGER spacecraft orbited Mercury from 2011 to 2015 and has provided new insights into the interior of the innermost planet. Mercury has a large metallic core ~2,000 km in radius covered by a thin layer of rock only ~420 km thick. Furthermore...

... lithophile, and volatile elements can become refractory. In this context, unexpected elements, such as Si, are extracted to the core, while others (S, C) concentrate in the silicate portion of the planet, eventually leading to an exotic surface mineralogy. In this article, experimental, theoretical...

...Bernard Charlier; Olivier Namur Unique physical and chemical characteristics of Mercury have been revealed by measurements from NASA's MESSENGER spacecraft. The closest planet to our Sun is made up of a large metallic core that is partially liquid, a thin mantle thought to be formed...

... exhibits complex behavior. Implications of these results to the lunar core and the Mercurian core are discussed. Our results imply that adding Si to a pure Fe lunar core would be invisible in terms of ν P , but exhibit a decreased ν S . Including Si in a sulfur-rich lunar core would display an increased ν...

... K at 15 GPa to 150 K at 40 GPa. The triple point, where the fcc, hcp, and liquid phases coexist in Fe-4wt% Si, is placed at 90–105 GPa and 3300–3600 K with the melting curve same as in Fe is assumed. This supports the idea that the hcp phase is stable at Earth's inner core conditions. The stable...

...-core components is crucial to understanding the formation, evolution, and dynamics of our planet. In the October 2018 issue of American Mineralogist , Lai et al. presented an experimental study on the thermoelastic properties of Fe 7 C 3 , a candidate component in the inner core, by single-crystal X...

...Seiji Kamada; Nanami Suzuki; Fumiya Maeda; Naohisa Hirao; Maki Hamada; Eiji Ohtani; Ryo Masuda; Takaya Mitsui; Yasuo Ohishi; Satoshi Nakano Abstract Planetary cores are composed mainly of Fe with minor elements such as Ni, Si, O, and S. The physical properties of Fe alloys depend...