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Provedor de dados:  ArchiMer
País:  France
Título:  Early oxidation of the martian crust triggered by impacts
Autores:  Deng, Zhengbin
Moynier, Frederic
Villeneuve, Johan
Jensen, Ninna K.
Liu, Deze
Cartigny, Pierre
Mikouchi, Takashi
Siebert, Julien
Agranier, Arnaud
Chaussidon, Marc
Bizzarro, Martin
Data:  2020-10
Ano:  2020
Resumo:  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 O-17-rich water reservoir. Such an early oxidation of the crust by impacts in the presence of water may have supplied greenhouse gas H-2 that caused an increase in surface temperature in a CO2-thick atmosphere.
Tipo:  Text
Idioma:  Inglês

Editor:  Amer Assoc Advancement Science
Formato:  application/pdf
Fonte:  Science Advances (2375-2548) (Amer Assoc Advancement Science), 2020-10 , Vol. 6 , N. 44 , P. eabc4941 (9p.)
Direitos:  info:eu-repo/semantics/openAccess

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