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Experimental evidence for hydrogen incorporation into Earth's core

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Title: Experimental evidence for hydrogen incorporation into Earth's core
Authors: Tagawa, Shoh Browse this author
Sakamoto, Naoya Browse this author
Hirose, Kei Browse this author
Yokoo, Shunpei Browse this author
Hernlund, John Browse this author
Ohishi, Yasuo Browse this author
Yurimoto, Hisayoshi Browse this author →KAKEN DB
Issue Date: 11-May-2021
Publisher: Nature Research
Journal Title: Nature communications
Volume: 12
Issue: 1
Start Page: 2588
Publisher DOI: 10.1038/s41467-021-22035-0
Abstract: Hydrogen is one of the possible alloying elements in the Earth's core, but its siderophile (iron-loving) nature is debated. Here we experimentally examined the partitioning of hydrogen between molten iron and silicate melt at 30-60 gigapascals and 3100-4600 kelvin. We find that hydrogen has a metal/silicate partition coefficient D-H >= 29 and is therefore strongly siderophile at conditions of core formation. Unless water was delivered only in the final stage of accretion, core formation scenarios suggest that 0.3-0.6 wt% H was incorporated into the core, leaving a relatively small residual H2O concentration in silicates. This amount of H explains 30-60% of the density deficit and sound velocity excess of the outer core relative to pure iron. Our results also suggest that hydrogen may be an important constituent in the metallic cores of any terrestrial planet or moon having a mass in excess of similar to 10% of the Earth.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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