Инд. авторы:	Yuan L., Ohtani E., Ikuta D., Kamada S., Tsuchiya J., Naohisa H., Ohishi Y., Suzuki A.
Заглавие:	Chemical Reactions Between Fe and H2O up to Megabar Pressures and Implications for Water Storage in the Earth's Mantle and Core
Библ. ссылка:	Yuan L., Ohtani E., Ikuta D., Kamada S., Tsuchiya J., Naohisa H., Ohishi Y., Suzuki A. Chemical Reactions Between Fe and H2O up to Megabar Pressures and Implications for Water Storage in the Earth's Mantle and Core // Geophysical Research Letters. - 2018. - Vol.45. - Iss. 3. - P.1330-1338. - ISSN 0094-8276. - EISSN 1944-8007.
Идентиф-ры:	DOI: 10.1002/2017GL075720; РИНЦ: 35535152; SCOPUS: 2-s2.0-85041531981; WoS: 000426161800016;
Реферат:	eng: We investigated the phase relations of the Fe-H2O system at high pressures based on in situ X-ray diffraction experiments and first-principles calculations and demonstrate that FeHx and FeO are present at pressures less than similar to 78 GPa. A recently reported pyrite-structured FeO2 was identified in the Fe-H2O system at pressures greater than similar to 78 GPa after laser heating. The phase observed in this study has a unit cell volume 8%-11% larger than that of FeO2, produced in the Fe-O binary system reported previously, suggesting that hydrogen might be retained in a FeO2Hx crystal structure. Our observations indicate that H2O is likely introduced into the deep Earth through reaction between iron and water during the accretion and separation of the metallic core. Additionally, reaction between Fe and H2O would occur at the core-mantle boundary, given water released from hydrous subducting slabs that intersect with the metallic core. Accumulation of volatile-bearing iron compounds may provide new insights into the enigmatic seismic structures observed at the base of the lower mantle.
Ключевые слова:	FEOOH; STABILITY; HYDROGEN; IN-SITU; DEEP LOWER-MANTLE; EQUATION-OF-STATE; X-RAY-DIFFRACTION; PHASE DELTA-ALOOH; IRON HYDRIDE; GPA;
Издано:	2018
Физ. хар-ка:	с.1330-1338
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