Early oxidation of the martian crust triggered by impacts
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Early oxidation of the martian crust triggered by impacts. / Deng, Zhengbin; Moynier, Frederic; Villeneuve, Johan; Jensen, Ninna K.; Liu, Deze; Cartigny, Pierre; Mikouchi, Takashi; Siebert, Julien; Agranier, Arnaud; Chaussidon, Marc; Bizzarro, Martin.
I: Science Advances, Bind 6, Nr. 44, 4941, 2020.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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T1 - Early oxidation of the martian crust triggered by impacts
AU - Deng, Zhengbin
AU - Moynier, Frederic
AU - Villeneuve, Johan
AU - Jensen, Ninna K.
AU - Liu, Deze
AU - Cartigny, Pierre
AU - Mikouchi, Takashi
AU - Siebert, Julien
AU - Agranier, Arnaud
AU - Chaussidon, Marc
AU - Bizzarro, Martin
PY - 2020
Y1 - 2020
N2 - 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.
AB - 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.
KW - TITANIUM ISOTOPE FRACTIONATION
KW - OXYGEN FUGACITY
KW - GALE CRATER
KW - MARS
KW - MELT
KW - METEORITE
KW - TEMPERATURE
KW - DIVERSITY
KW - CHEMISTRY
KW - HISTORY
U2 - 10.1126/sciadv.abc4941
DO - 10.1126/sciadv.abc4941
M3 - Journal article
C2 - 33127679
VL - 6
JO - Science advances
JF - Science advances
SN - 2375-2548
IS - 44
M1 - 4941
ER -
ID: 251636833