Early oxidation of the martian crust triggered by impacts - Université Paris Cité Accéder directement au contenu
Article Dans Une Revue Science Advances Année : 2020

Early oxidation of the martian crust triggered by impacts

Résumé

Despite the abundant geomorphological evidence for surface liquid water on Mars during the Noachian epoch (>3.7 billion years ago), attaining a warm climate to sustain liquid water on Mars at the period of the faint young Sun is a long-standing question. Here, we show that melts of ancient mafic clasts from a martian regolith meteorite, NWA 7533, experienced substantial Fe-Ti oxide fractionation. This implies early, impact-induced, oxidation events that increased by five to six orders of magnitude the oxygen fugacity of impact melts from remelting of the crust. Oxygen isotopic compositions of sequentially crystallized phases from the clasts show that progressive oxidation was due to interaction with an 17O-rich water reservoir. Such an early oxidation of the crust by impacts in the presence of water may have supplied greenhouse gas H2 that caused an increase in surface temperature in a CO2-thick atmosphere.

Domaines

Géochimie
Fichier principal
Vignette du fichier
sciadv.abc4941.pdf (225.82 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03840869 , version 1 (07-11-2022)

Licence

Paternité - Pas d'utilisation commerciale

Identifiants

Citer

Zhengbin Deng, Frédéric Moynier, Johan Villeneuve, Ninna Jensen, Deze Liu, et al.. Early oxidation of the martian crust triggered by impacts. Science Advances , 2020, 6 (44), pp.119791. ⟨10.1126/sciadv.abc4941⟩. ⟨hal-03840869⟩
27 Consultations
17 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More