Tardi-magmatic precipitation of Martian Fe/Mg-rich clay minerals via igneous differentiation - Université de Lille Accéder directement au contenu
Article Dans Une Revue Geochemical Perspectives Letters Année : 2020

Tardi-magmatic precipitation of Martian Fe/Mg-rich clay minerals via igneous differentiation

Résumé

Mars is seen as a basalt covered world that has been extensively altered through hydrothermal or near surface water-rock interactions. As a result, all the Fe/Mg-rich clay minerals detected from orbit so far have been interpreted as secondary, i.e. as products of aqueous alteration of pre-existing silicates by (sub)surface water. Based on the fine scale petrographic study of the evolved mesostasis of the Nakhla meteorite, we report here the presence of primary Fe/Mg-rich clay minerals that directly precipitated from a water-rich fluid exsolved from the Cl-rich parental melt of nakhlites during igneous differentiation. Such a tardi-magmatic precipitation of clay minerals requires much lower amounts of water compared to production via aqueous alteration. Although primary Fe/Mg-rich clay minerals are minor phases in Nakhla, the contribution of such a process to Martian clay formation may have been quite significant during the Noachian given that Noachian magmas were richer in H2O. In any case, the present discovery justifies a re-evaluation of the exact origin of the clay minerals detected on Mars so far, with potential consequences for our vision of the early magmatic and climatic histories of Mars.
Fichier principal
Vignette du fichier
GPL2023_SI.pdf (3.79 Mo) Télécharger le fichier
Origine Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-02927306 , version 2 (01-09-2020)
hal-02927306 , version 1 (24-11-2020)

Licence

Identifiants

Citer

J.-C. Viennet, S. Bernard, Corentin Le Guillou, V. Sautter, P. Schmitt-Kopplin, et al.. Tardi-magmatic precipitation of Martian Fe/Mg-rich clay minerals via igneous differentiation. Geochemical Perspectives Letters, 2020, pp.47-52. ⟨10.7185/geochemlet.2023⟩. ⟨hal-02927306v2⟩
153 Consultations
159 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More