Northwest Africa 5958: A weakly altered CM-related ungrouped chondrite, not a CI3 - Archive ouverte HAL
Article Dans Une Revue Meteoritics and Planetary Science Année : 2016

Northwest Africa 5958: A weakly altered CM-related ungrouped chondrite, not a CI3

Emmanuel Jacquet
Jean-Alix J-A Barrat
Pierre Beck
Florent Caste
  • Fonction : Auteur
Matthieu Gounelle

Résumé

Northwest Africa (NWA) 5958 is a carbonaceous chondrite found in Morocco in 2009. Preliminary chemical and isotopic data leading to its initial classification as C3.0 ungrouped have prompted us to conduct a multitechnique study of this meteorite and present a general description here. The petrography and chemistry of NWA 5958 is most similar to a CM chondrite, with a low degree of aqueous alteration, apparently under oxidizing conditions, and evidence of a second, limited alteration episode manifested by alteration fronts. The oxygen isotopic composition, with Delta ` O-17 = -4.3 parts per thousand, is more O-16-rich than all CM chondrites, indicating, along with other compositional arguments, a separate parent body of origin. We suggest that NWA 5958 be reclassified as an ungrouped carbonaceous chondrite related to the CM group.
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Dates et versions

hal-01765480 , version 1 (06-01-2025)

Identifiants

Citer

Emmanuel Jacquet, Jean-Alix J-A Barrat, Pierre Beck, Florent Caste, Jérôme Gattacceca, et al.. Northwest Africa 5958: A weakly altered CM-related ungrouped chondrite, not a CI3. Meteoritics and Planetary Science, 2016, 51 (5), pp.851-869. ⟨10.1111/maps.12628⟩. ⟨hal-01765480⟩
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