Low hydrogen contents in the cores of terrestrial planets - Laboratoire Magmas et Volcans Accéder directement au contenu
Article Dans Une Revue Science Advances Année : 2018

Low hydrogen contents in the cores of terrestrial planets

Résumé

Hydrogen has been thought to be an important light element in Earth's core due to possible siderophile behavior during core-mantle segregation. We reproduced planetary differentiation conditions using hydrogen contents of 450 to 1500 parts per million (ppm) in the silicate phase, pressures of 5 to 20 GPa, oxygen fugacity varying within IW-3.7 and IW-0.2 (0.2 to 3.7 log units lower than iron-wüstite buffer), and Fe alloys typical of planetary cores. We report hydrogen metal-silicate partition coefficients of ~2 × 10$^{−1}$ , up to two orders of magnitude lower than reported previously , and indicative of lithophile behavior. Our results imply H contents of ~60 ppm in the Earth and Martian cores. A simple water budget suggests that 90% of the water initially present in planetary building blocks was lost during planetary accretion. The retained water segregated preferentially into planetary mantles.
Fichier principal
Vignette du fichier
e1701876.full.pdf (610.54 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

cea-01736955 , version 1 (19-03-2018)

Licence

Paternité - Pas d'utilisation commerciale

Identifiants

Citer

Vincent Clesi, Mohamed Ali M.A. Bouhifd, Nathalie Bolfan-Casanova, Geeth Manthilake, Federica Schiavi, et al.. Low hydrogen contents in the cores of terrestrial planets. Science Advances , 2018, 4 (3), pp.e1701876. ⟨10.1126/sciadv.1701876⟩. ⟨cea-01736955⟩
1149 Consultations
99 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More