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RAS Earth ScienceГеохимия Geochemistry International

  • ISSN (Print) 0016-7525
  • ISSN (Online) 3034-4956

METAL-RICH UNGROUPED CHONDRITE NORTHWEST AFRICA 13202

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PII
S3034495625090019-1
DOI
10.7868/S3034495625090019
Publication type
Article
Status
Published
Authors
M.A. Ivanova
  • Affiliation: Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences
K.M. Ryazantsev
  • Affiliation: Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences
S.N. Teplyakova
  • Affiliation: Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences
D.A. Sadilenko
  • Affiliation: Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences
Volume/ Edition
Volume 70 / Issue number 9
Pages
677-691
Abstract
A meteorite of a new type, NWA 13202, was revealed for the first time in the collection of the Russian Academy of Sciences. It belongs to metal-rich ungrouped chondrites and is paired with chondrites NWA 12379/12273. These chondrites contain on average ~70 vol. % Fe, Ni metal, and ~20 vol. % of chondrules and silicate inclusions imbedded in metal. Similar to other known metal-rich chondrites (G, CH, CBa, and CBb), there is no fine-grained silicate matrix in NWA 13202. Chondrules are represented mainly by porphyritic olivine-pyroxene, olivine and pyroxene types (POP, OP and PP); non-porphyritic chondrules (BO, SO, CC, RC, GC) are rare. Olivine has an L-chondrite chemical composition, Fa25.9 ± 3.5 mol. %, and low-Ca-pyroxene is Fs17.2 ± 5.7 mol. %, which resembles more closely H chondrites. According to the olivine composition heterogeneity, the meteorite corresponds to chondrites of the 3–4 petrological type. Accessory minerals are phosphates and chromite. The metal includes low-Ni kamacite and high-Ni taenite and tetrataenite, and the only sulfide is troilite. The oxygen isotopic composition of chondrule silicates of these ungrouped chondrites confirms their affinities to the oxygen isotope reservoir of LL chondrites (Jansen et al., 2019). The metal experienced partial melting and its formation age is ~2.4 Ma after the formation of CaAl – inclusions (Liu et al., 2023). The studied chondrites were probably formed as a result of a catastrophic collision of metallic and chondritic bodies. The intensity and conditions during this event were not sufficient to form chondrules with chondrules of a quenched structure such as CC and SO types. After the reaccretion of a new parent body of the metal-rich ungrouped chondrite, the material of NWA 13202 and NWA 12379/12273 was affected by aqueous alteration and metamorphism at a temperature of ~600°C, which produced phosphates and rims of Fe-rich olivine around low-Ca pyroxene.
Keywords
богатые металлом хондриты порфировые и непорфировые хондры катастрофическое ударное событие реаккреция водные преобразования флюид и термальный метаморфизм на родительском астероиде
Date of publication
07.03.2025
Year of publication
2025
Number of purchasers
0
Views
24

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