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Article Dans Une Revue Science Advances Année : 2022

Late delivery of exotic chromium to the crust of Mars by water-rich carbonaceous asteroids

Ke Zhu
Martin Schiller
Lu Pan
Nikitha Susan Saji
  • Fonction : Auteur
Kirsten Larsen
Elsa Amsellem
Courtney Rundhaug
Paolo Sossi
Ingo Leya
Martin Bizzarro
  • Fonction : Auteur

Résumé

The terrestrial planets endured a phase of bombardment following their accretion, but the nature of this late accreted material is debated, preventing a full understanding of the origin of inner solar system volatiles. We report the discovery of nucleosynthetic chromium isotope variability (μ 54 Cr) in Martian meteorites that represent mantle-derived magmas intruded in the Martian crust. The μ 54 Cr variability, ranging from −33.1 ± 5.4 to +6.8 ± 1.5 parts per million, correlates with magma chemistry such that samples having assimilated crustal material define a positive μ 54 Cr endmember. This compositional endmember represents the primordial crust modified by impacting outer solar system bodies of carbonaceous composition. Late delivery of this volatile-rich material to Mars provided an exotic water inventory corresponding to a global water layer >300 meters deep, in addition to the primordial water reservoir from mantle outgassing. This carbonaceous material may also have delivered a source of biologically relevant molecules to early Mars.
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Dates et versions

hal-03935961 , version 1 (19-01-2023)

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Ke Zhu, Martin Schiller, Lu Pan, Nikitha Susan Saji, Kirsten Larsen, et al.. Late delivery of exotic chromium to the crust of Mars by water-rich carbonaceous asteroids. Science Advances , 2022, 8 (46), pp.1-6. ⟨10.1126/sciadv.abp8415⟩. ⟨hal-03935961⟩
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