Early oxidation of the martian crust triggered by impacts

Type Article
Date 2020-10
Language English
Author(s) Deng ZhengbinORCID1, 3, Moynier Frederic1, Villeneuve Johan2, Jensen Ninna K.3, Liu Deze1, Cartigny Pierre1, Mikouchi TakashiORCID4, Siebert JulienORCID1, Agranier Arnaud5, 6, Chaussidon Marc1, Bizzarro MartinORCID1, 3
Affiliation(s) 1 : Univ Paris, Inst Phys Globe Paris, CNRS, F-75005 Paris, France.
2 : Univ Lorraine, CRPG UMR 7350, CNRS, F-7358 Vandoeuvre Les Nancy, France.
3 : Univ Copenhagen, Ctr Star & Planet Format, Globe Inst, Copenhagen, Denmark.
4 : Univ Tokyo, Univ Museum, Tokyo, Japan.
5 : Univ Bretagne Occident, Lab Geosci Ocean, UMR CNRS 6538, Plouzane, France.
6 : Inst Univ Europe Mer, Plouzane, France.
Source Science Advances (2375-2548) (Amer Assoc Advancement Science), 2020-10 , Vol. 6 , N. 44 , P. eabc4941 (9p.)
DOI 10.1126/sciadv.abc4941
WOS© Times Cited 17

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.

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Publisher's official version 9 270 KB Open access
Supplementary Text Figs. S1 to S14 References 28 20 MB Open access
Data file S1 1 MB Open access
Data file S2 52 KB Open access
Data file S3 1 MB Open access
Data file S4 1 MB Open access
Data file S5 46 KB Open access
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Deng Zhengbin, Moynier Frederic, Villeneuve Johan, Jensen Ninna K., Liu Deze, Cartigny Pierre, Mikouchi Takashi, Siebert Julien, Agranier Arnaud, Chaussidon Marc, Bizzarro Martin (2020). Early oxidation of the martian crust triggered by impacts. Science Advances, 6(44), eabc4941 (9p.). Publisher's official version : https://doi.org/10.1126/sciadv.abc4941 , Open Access version : https://archimer.ifremer.fr/doc/00686/79855/