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Tardi-magmatic precipitation of Martian Fe/Mg-rich clay minerals via igneous differentiation.
Geochem. Perspect. Lett. 14, 47-52 (2020)
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-magma tic 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 day minerals detected on Mars so far, with potential consequences for our vision of the early magmatic and climatic histories of Mars.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
In-situ; Mars; Origin; Rocks; Constraints; Chlorine; Nakhlite; Crust; Meteorites; Evolution
ISSN (print) / ISBN
2410-339X
e-ISSN
2410-3403
Journal
Geochemical perspectives letters
Quellenangaben
Volume: 14,
Pages: 47-52
Publisher
European Assoc Geochemistry
Publishing Place
Paris
Non-patent literature
Publications
Institute(s)
Research Unit BioGeoChemistry and Analytics (BGC)