Petrological traverse of the olivine cumulate Séítah formation at Jezero crater, Mars : A perspective from SuperCam onboard Perseverance - Archive ouverte HAL Access content directly
Journal Articles Journal of Geophysical Research. Planets Year : 2023

Petrological traverse of the olivine cumulate Séítah formation at Jezero crater, Mars : A perspective from SuperCam onboard Perseverance

1 IMPMC - Institut de minéralogie, de physique des matériaux et de cosmochimie
2 IRAP - Institut de recherche en astrophysique et planétologie
3 Department of Geoscience [Las Vegas]
4 Department of Earth and Planetary Sciences [Knoxville]
5 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics
6 CELIA - Centre d'Etudes Lasers Intenses et Applications
7 JPL - Jet Propulsion Laboratory
8 IAS - Institut d'astrophysique spatiale
9 LGL-TPE - Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement
10 APL - Johns Hopkins University Applied Physics Laboratory [Laurel, MD]
11 LPG-ANGERS - Laboratoire de Planétologie et Géosciences - Angers
12 Department of Analytical Chemistry [Malaga]
13 Astrogeology Science Center [Flagstaff]
14 Department of Analytical Chemistry [Leioa]
15 Department of Earth Science and Engineering [Imperial College London]
16 IMPMC_ROCKS - Research On Carbon-rich Key Samples [IMPMC]
17 EAPS - Department of Earth, Atmospheric and Planetary Sciences [MIT, Cambridge]
18 Plancius Research LLC
19 LANL - Los Alamos National Laboratory
20 University of Winnipeg
21 LESIA - Laboratoire Energie Signal Images et Automatique [Univ Ngaoundéré]
23 LPG - Laboratoire de Planétologie et Géosciences [UMR_C 6112]
24 UVa - Universidad de Valladolid [Valladolid]
25 JSC - NASA Johnson Space Center
26 Department of Geosciences [Stony Brook]
27 HIGP - Hawaii Institute of Geophysics and Planetology
28 DLR Institute of Optical Sensor Systems
29 EAPS - Department of Earth, Atmospheric, and Planetary Sciences [West Lafayette]
A. Udry
Y. Liu
  • Function : Author
R. Anderson
G. Arana
Sylvain Bernard
A.J. Brown
K. Castro
B. Chide
S. Clegg
E. Cloutis
G. Lopez-Reyes
S. Mclennan
J.A. Manrique
Franck Montmessin
J. Núñez
S. Schröder
J.I. Simon
M. Veneranda
P.A. Willis


Séítah is the stratigraphically lowest formation visited by Perseverance in the Jezero crater floor. We present the data obtained by SuperCam: texture by imagery, chemistry by LIBS, and mineralogy by VISIR and Raman spectroscopy. The Séítah formation consists of igneous, weakly altered, rocks dominated by millimeter-size grains of olivine with the presence of low-Ca and high-Ca pyroxenes, and other primary minerals (e.g., plagioclase, Cr-Fe-Ti oxides, phosphates). Along a ∼140 m long section in Séítah, SuperCam analyses showed evidence of geochemical and mineralogical variations, from the contact with the overlying Máaz formation, going deeper in the formation. Bulk rock and olivine Mg#, grain size, olivine content increase gradually further from the contact. Along the section, olivine Mg# are not in equilibrium with the bulk rock Mg#, indicating local olivine accumulation. These observations are consistent with Séítah being the deep ultramafic member of a cumulate series derived from the fractional crystallization and slow cooling of the parent magma at depth. Possible magmatic processes and exhumation mechanisms of Séítah are discussed. Séítah rocks show some affinity with some rocks at Gusev crater, and with some martian meteorites suggesting that such rocks are not rare on the surface of Mars. Séítah is part of the Nili Fossae regional olivine-carbonate unit observed from orbit. Future exploration of Perseverance on the rim and outside of the crater will help determine if the observations from the crater floor can be extrapolated to the whole unit, or if this unit is composed of distinct sub-units with various origins.
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insu-04116300 , version 1 (01-11-2023)



O. Beyssac, O. Forni, A. Cousin, A. Udry, L.C. Kah, et al.. Petrological traverse of the olivine cumulate Séítah formation at Jezero crater, Mars : A perspective from SuperCam onboard Perseverance. Journal of Geophysical Research. Planets, 2023, The MARS Perseverance Rover Jezero Crater Floor Campaign, 128 (7), pp.e2022JE007638. ⟨10.1029/2022JE007638⟩. ⟨insu-04116300⟩
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