NORTHWEST AFRICA (NWA) 12563 and ungrouped C2 chondrites: Alteration styles and relationships to asteroids

Hewins, R. H.; Zanetta, Pierre-Marie; Zanda, B.; Guillou, C. Le; Gattacceca, J.; Sognzoni, C.; Pont, Sylvain; Piani, Laurette; Rigaudier, Thomas; Leroux, Hugues; Brunetto, R.; Maupin, R.; Djouadi, Z.; Bernard, Sylvain; Deldicque, Damien; Malarewicz, V.; Dionnet, Z.; Aléon-Toppani, A.; King, Ashley; Borondics, Ferenc

doi:10.1016/j.gca.2021.06.035

Cited by 10 publications

(11 citation statements)

References 154 publications

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“…12. Based on Hewins et al (2021), QUE 99038 and EET 83226 fall within the C2-ung2 cluster; however, their oxygen isotopic compositions overlap with those of CV3 and CO chondrites as well and the C2-ung2 subclassification seems unhelpful for differentiation purposes in our case. Tarda falls within the C2-ung1 chondrite range along with Tagish Lake, and their similarity is well supported with oxygen isotopic compositions.…”

Section: Comparison With Other Chondrite Groupsmentioning

confidence: 55%

“…Hewins et al. (2021) divided the ungrouped C2 chondrites into two clusters, C2‐ung1 and C2‐ung2, based on their oxygen isotope distributions. These clusters fall near the upper and lower end of the oxygen isotope distribution of CM chondrites, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…Bulk oxygen isotopic composition is one of the main criteria and often a useful indicator of meteorite classification, including carbonaceous chondrites, though some overlap between the groups does exist. Hewins et al (2021) divided the ungrouped C2 chondrites into two clusters, C2-ung1 and C2-ung2, based on their oxygen isotope distributions. These clusters fall near the upper and lower end of the oxygen isotope distribution of CM chondrites, respectively.…”

Section: Comparison With Other Chondrite Groupsmentioning

confidence: 99%

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Compositional and spectroscopic investigation of three ungrouped carbonaceous chondrites

Yeşiltaş

Kebukawa

Glotch

et al. 2022

Meteorit & Planetary Scien

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Ungrouped carbonaceous chondrites are not easily classified into one of the well‐established groups due to compositional/petrological differences and geochemical anomalies. Type 2 ungrouped carbonaceous chondrites represent a very small fraction of all carbonaceous chondrites. They can potentially represent different aspects of asteroids and their regolith material. By conducting a multitechnique investigation, we show that Queen Alexandra Range (QUE) 99038 and Elephant Moraine (EET) 83226 do not resemble type 2 carbonaceous chondrites. QUE 99038 exhibits coarse‐grained matrix, Fe‐rich rims on olivines, and an apparent lack of tochilinite, suggesting that QUE 99038 has been metamorphosed. Its polyaromatic organic matter structures closely resemble oxidized CV3 chondrites. EET 83226 exhibits a clastic texture with high porosity and shows similarities to CO3 chondrites. It consists of numerous large chondrules with fine‐grained rims that are often fragmented and discontinuous and set within matrix, suggesting a formation mechanism for the rims in a regolith environment. The kind of processes that can result in such chemical compositions as in QUE 99038 and EET 83226 is currently not fully known and clearly presents a conundrum. Tarda is a highly friable carbonaceous chondrite with close resemblance to Tagish Lake (ungrouped C2 chondrite). It comprises different types of chondrules (some with Fe‐rich rims), framboid magnetite, sulfides, carbonates, and phyllosilicate‐ and carbon‐rich matrix, and is consistent with being an ungrouped C2 chondrite.

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Section: Comparison With Other Chondrite Groupsmentioning

confidence: 55%

Section: Discussionmentioning

confidence: 99%

Section: Comparison With Other Chondrite Groupsmentioning

confidence: 99%

See 1 more Smart Citation

Compositional and spectroscopic investigation of three ungrouped carbonaceous chondrites

Yeşiltaş

Kebukawa

Glotch

et al. 2022

Meteorit & Planetary Scien

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“…While being described as a CM1/2, Kolang occupies its own quadrant, with little similarities to Aguas Zarcas and Mukundpura. Tarda and Orgueil share the same quadrant, emphasising that Tarda differs from the CM2 subtype (Hewins et al, 2021). By rastering the ionisation laser on the solid sample between each scan, FTICR should probe the sample's spatial heterogeneity.…”

Section: Resultsmentioning

confidence: 99%

Diversity of chondritic organic matter probed by ultra-high resolution mass spectrometry

Laurent¹,

Maillard²,

Afonso³

et al. 2022

Geochem. Persp. Let.

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Primitive carbonaceous chondrites exhibit an unparalleled diversity in terms of their organic content, in addition to a variable degree of hydrothermal alteration. Whether this diversity results from the circulation of fluids or from a multiplicity of precursors remains an open question of prime interest to understand the formation of carbonaceous asteroids. We applied laser desorption ionization Fourier transform ion cyclotron resonance mass spectrometry (LDI-FTICR-MS) on the macromolecular carbon of recent CM carbonaceous chondrite falls, as well as Orgueil (CI) and Tarda (C2). We probed the diversity of molecular fragments released under low power laser beam. The abundance of the chemical families is correlated to the extent of aqueous alteration, which promotes a structural aromatisation. The weakly altered Paris has retained the largest chemical heterogeneity, whilst it is lost in more altered chondrites. Orgueil and Tarda insoluble organic matter share similarities; this is consistent with Tarda and Orgueil originating from the outer belt region. Applied to returned asteroidal samples, FTICR-MS may help unravelling the origin and evolution of organic compounds during the early stages of the solar system.

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“…We thus submit that Bells should be reclassified as a CR2-an. We note that Bells was one of the magnetite-rich, 16 Opoor ungrouped CCs that Hewins et al (2021) called "C2-ung1." It is then conceivable that at least some of these particular meteorites will turn out to be CR-an as well.…”

Section: Reclassifying Bells As Cr2-anmentioning

confidence: 95%

From whom Bells tolls: Reclassifying Bells among CR chondrites and implications for the formation conditions of CR parent bodies

Marrocchi

Jacquet

Neukampf

et al. 2022

Meteorit & Planetary Scien

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The ungrouped carbonaceous chondrite (CC) Bells has long been considered petrographically similar to CM chondrites based on its matrix abundance and degree of aqueous alteration, but also shows significant isotopic affinities to CR chondrites. Its taxonomic status is thus important for clarifying the relationship of the CRHB (formerly "CR") clan with other CCs. In this study, we measured the oxygen isotopic compositions of olivines in type I chondrules and isolated olivine grains in Bells. Bells olivines mostly have Δ 17 O > À4&, similar to CR chondrites but unlike other CCs that are rich in refractory inclusions, in which chondrules are generally richer in 16 O. Therefore, Bells is a CR chondrite (albeit an anomalous one), most similar to the rare, matrix-rich CRs like Al Rais. These chondrites (i) may not necessarily derive from the same primary parent body as mainstream CRs, (ii) bear witness to significant variations of the matrix/chondrule ratio within the CRHB clan, and (iii) may be a good analog for samples retrieved by the space mission OSIRIS-REx.

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NORTHWEST AFRICA (NWA) 12563 and ungrouped C2 chondrites: Alteration styles and relationships to asteroids

Cited by 10 publications

References 154 publications

Compositional and spectroscopic investigation of three ungrouped carbonaceous chondrites

Compositional and spectroscopic investigation of three ungrouped carbonaceous chondrites

Diversity of chondritic organic matter probed by ultra-high resolution mass spectrometry

From whom Bells tolls: Reclassifying Bells among CR chondrites and implications for the formation conditions of CR parent bodies

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