Titre du document / Document title

Iron hydride formed by the reaction of iron, silicate, and water: implications for the light element of the earth's core

Auteur(s) / Author(s)

YAGI T. ; HISHINUMA T. ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

Univ. Tokyo, inst. solid state physics, Minato-ku, Tokyo 106, JAPON

Résumé / Abstract

In situ high pressure-temperature X-ray observations were made on the system of iron, silicate mineral, and water up to 4.9 GPa and 1350 °C using a cubic-anvil high pressure apparatus and synchrotron radiation. Above a pressure of 2.8 GPa at temperatures above 550 °C, iron reacts with water to form iron hydride and iron oxide. The chemical composition of the iron hydride formed is estimated to be FeH_0.3-FeH_0.4. This result implies that if water was contained together with iron and silicates at sufficient depth within the primordial Earth, iron should have transformed into iron hydride. The density of iron hydride thus formed can explain a large portion of the density deficit of the Earth's core. These results show that hydrogen is likely a component of the Earth's core.

Revue / Journal Title

Geophysical research letters   ISSN 0094-8276   CODEN GPRLAJ 

Source / Source

1995, vol. 22, n^o14, pp. 1933-1936 (23 ref.)

Langue / Language

Anglais

Editeur / Publisher

American Geophysical Union, Washington, DC, ETATS-UNIS  (1974) (Revue)

Mots-clés anglais / English Keywords

core ; interior ; X-rays ; iron minerals ; high pressure ; high temperature ; temperature ; iron oxides ; chemical composition ; water ; silicates ; depth ; iron ; X ray observation ; Chemical composition ; Mineral water ;

Mots-clés français / French Keywords

Noyau terrestre ; Constitution interne ; Rayon X ; Minéral fer ; Haute pression ; Haute température ; Température ; Oxyde fer ; Analyse chimique ; Eau ; Silicate ; Profondeur ; Fer ; Observation RX ; Composition chimique ; Eau minéralisée ;

Mots-clés espagnols / Spanish Keywords

Núcleo terrestre ; Constitución del globo ; Rayos X ; Mineral hierro ; Alta presión ; Alta temperatura ; Temperatura ; Óxido de hierro ; Análisis químico ; Agua ; Silicato ; Profundidad ; Hierro ; Observación RX ; Composición química ; Agua mineral ;

Localisation / Location

INIST-CNRS, Cote INIST : 16687, 35400005359519.0240