Data/hora: 02/06/2024 17:12:03

Provedor de dados: 	5	
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 (&gt;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	
Identificador: 	https://archimer.ifremer.fr/doc/00686/79855/82697.pdf

https://archimer.ifremer.fr/doc/00686/79855/82698.pdf

https://archimer.ifremer.fr/doc/00686/79855/82699.xlsx

https://archimer.ifremer.fr/doc/00686/79855/82700.xlsx

https://archimer.ifremer.fr/doc/00686/79855/82701.xlsx

https://archimer.ifremer.fr/doc/00686/79855/82702.xlsx

https://archimer.ifremer.fr/doc/00686/79855/82703.xlsx

DOI:10.1126/sciadv.abc4941

https://archimer.ifremer.fr/doc/00686/79855/	
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.)	
Fonte: 	info:eu-repo/semantics/openAccess

restricted use