Oued Chebeika 002: A new <scp>CI1</scp> meteorite linked to outer solar system bodies

Abstract CI1 chondrites are rare meteorites with high scientific value. In fact, they are the most chemically primitive meteorites and show evidence of intense parent‐body aqueous alteration. They also share strong similarities with samples from Ryugu and Bennu asteroids returned by the JAXA Hayabusa2 and NASA's OSIRIS‐REx missions. In this work, we present a detailed study of the Oued Chebeika 002 meteorite, a ~420 g CI1 chondrite found in Morocco in 2024. We describe its petrography, texture, and mineralogy, with a focus on clay mineralogy. We provide the bulk and mineral chemical composition, as well as the bulk oxygen, iron, and chromium isotopic compositions. Spectroscopic properties were studied by means of infrared and Raman spectroscopies. We also measured the density, grain density and magnetic properties. Our results confirm that Oued Chebeika 002 is a CI1 chondrite, with close similarities to the other five know CI1 chondrites, and samples from Ryugu and Bennu asteroids. Several lines of evidence indicate that Oued Chebeika 002 has suffered no significant terrestrial alteration. It is more pristine in that regard than Alais, Orgueil and Ivuna CI1 chondrites, and more similar to samples from asteroids Ryugu and Bennu. Subtle differences exist between Oued Chebeika 002 and other CI1 chondrites that cannot be accounted for by terrestrial alteration of the latter. For instance, olivine and calcite were not observed. It is also noteworthy that the magnetic mineral assemblage of Oued Chebeika 002 is significantly different from that of Alais, Ivuna and Orgueil, but undiscernible from that of Ryugu samples. Chromium and iron isotopic composition of Oued Chebeika 002 confirms that CI1 chondrites, like Ryugu samples, are distinct from meteorites belonging to the non‐carbonaceous and carbonaceous isotopic groups and may have originated from the same region where ice giant planets and Oort Cloud comets were formed.

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Publication Details

Journal
Meteoritics and Planetary Science
Published
2025-05-05
DOI
https://doi.org/10.1111/maps.14359
Citations
9
Primary Topic
Astro and Planetary Science
Type
article
Field-Weighted Citation Impact
10.39

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article

Oued Chebeika 002: A new CI1 meteorite linked to outer solar system bodies

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9 citations
Meteoritics and Planetary Science
Astro and Planetary Science
10.39
article

Oued Chebeika 002: A new CI1 meteorite linked to outer solar system bodies

M. Gounelle, Karina Silva García, Nicolas Dauphas, Vassilissa Vinogradoff, Peter Beck, Vladimir Vidal, Brett L. Clark, C. S. Harrison, Janusz Juraszek, Mathieu Roskosz, Tetsuya Yokoyama, P. Rochette, P. R. Heck, L. Bonal, J. Gattacceca, Olivier Poch, Sonia M. Tikoo-Schantz, Olivier Grauby, Debarun Mukherjee, Bertrand Devouard, Jean‐Christophe Viennet, Clara Maurel, Jean‐Alix Barrat, A. J. King, Daniel Borschneck, Pierre Vernazza, D. AuYang
article en
9 citations

Abstract

Abstract CI1 chondrites are rare meteorites with high scientific value. In fact, they are the most chemically primitive meteorites and show evidence of intense parent‐body aqueous alteration. They also share strong similarities with samples from Ryugu and Bennu asteroids returned by the JAXA Hayabusa2 and NASA's OSIRIS‐REx missions. In this work, we present a detailed study of the Oued Chebeika 002 meteorite, a ~420 g CI1 chondrite found in Morocco in 2024. We describe its petrography, texture, and mineralogy, with a focus on clay mineralogy. We provide the bulk and mineral chemical composition, as well as the bulk oxygen, iron, and chromium isotopic compositions. Spectroscopic properties were studied by means of infrared and Raman spectroscopies. We also measured the density, grain density and magnetic properties. Our results confirm that Oued Chebeika 002 is a CI1 chondrite, with close similarities to the other five know CI1 chondrites, and samples from Ryugu and Bennu asteroids. Several lines of evidence indicate that Oued Chebeika 002 has suffered no significant terrestrial alteration. It is more pristine in that regard than Alais, Orgueil and Ivuna CI1 chondrites, and more similar to samples from asteroids Ryugu and Bennu. Subtle differences exist between Oued Chebeika 002 and other CI1 chondrites that cannot be accounted for by terrestrial alteration of the latter. For instance, olivine and calcite were not observed. It is also noteworthy that the magnetic mineral assemblage of Oued Chebeika 002 is significantly different from that of Alais, Ivuna and Orgueil, but undiscernible from that of Ryugu samples. Chromium and iron isotopic composition of Oued Chebeika 002 confirms that CI1 chondrites, like Ryugu samples, are distinct from meteorites belonging to the non‐carbonaceous and carbonaceous isotopic groups and may have originated from the same region where ice giant planets and Oort Cloud comets were formed.

Meteoritics and Planetary ScienceVol. 60(7)
Centre National de la Recherche Scientifique (FR), Université de Bretagne Occidentale (FR), Institut Universitaire de France (FR), Aix-Marseille Université (FR), Field Museum of Natural History (US), Sorbonne Université (FR), University of Oxford (GB), University of Chicago (US), Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement (FR), Centre de Recherche et d’Enseignement de Géosciences de l’Environnement (FR), Normandie Université (FR), Institut de minéralogie, de physique des matériaux et de cosmochimie (FR), Centre Interdisciplinaire de Nanoscience de Marseille (FR), Laboratoire des Sciences de l'Environnement Marin (FR), Institut de Recherche pour le Développement (FR), Université de Rouen Normandie (FR), Institut National des Sciences Appliquées Rouen Normandie (FR), Université Grenoble Alpes (FR), Stanford University (US)
UK Research and Innovation, Agence Nationale de la Recherche, Centre National d’Etudes Spatiales
Life below water
Openalex Percentile: Top 2%
Astro and Planetary Science
10.39
DOIOpen Access PDFOpenAlex
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