Northwest Africa 8418: The first CV4 chondrite

Northwest Africa 8418: The first CV4 chondrite

Northwest Africa (NWA) 8418 is an unusual chondrite whose properties do not exactly match those of any other known chondrite. It has similarities to the CV (Vigarano group), CK (Karoonda group), and CL (Loongana group) chondrites, but its abundance of large calcium‐aluminum‐rich inclusions (CAIs) an...

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Veröffentlicht in:Meteoritics & planetary science 2023-01, Vol.58 (1), p.135-157
Hauptverfasser: MacPherson, G. J., Nagashima, K., Krot, A. N., Kuehner, S. M., Irving, A. J., Ziegler, K., Mallozzi, L., Corrigan, C., Pitt, D.
Format: Artikel
Sprache:eng
Schlagworte:
Aluminum
Calcium-aluminum-rich inclusions
Chondrites
Kamacite
Magnesium
Monticellite
Nickel ores
Olivine
Pentlandite
Plagioclase
Sodalite
Troilite
Wollastonite
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Zusammenfassung:Northwest Africa (NWA) 8418 is an unusual chondrite whose properties do not exactly match those of any other known chondrite. It has similarities to the CV (Vigarano group), CK (Karoonda group), and CL (Loongana group) chondrites, but its abundance of large calcium‐aluminum‐rich inclusions (CAIs) and the low NiO content (600 °C. NWA 8418 contains kamacite, taenite, and troilite, and lacks magnetite and pentlandite. We propose that NWA 8418 be reclassified as a reduced CV4 chondrite, which makes it the first CV chondrite of petrologic type 4.
ISSN:1086-9379
1945-5100
DOI:10.1111/maps.13943