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Calama 029 | |||||||||||||||||||||||||||||||||||||||
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Basic information | Name: Calama 029 This is an OFFICIAL meteorite name. Abbreviation: There is no official abbreviation for this meteorite. Observed fall: No Year found: 2017 Country: Chile Mass: 590 g | ||||||||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 99 approved meteorites classified as LL7. [show all] Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||||||||||||
Comments: | Approved 4 Jul 2019 | ||||||||||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 108:
Calama 029 22°24’355"S, 068°34’401"W Antofagasta, Chile Find: 2017 Oct 14 Classification: Ordinary chondrite (LL7) History: Meteorite (590 g) was found 14 October 2017 by the UrFU meteorite expedition-2017 in Chile (Pastukhovich A. Yu., Larionov M. Yu., Kruglikov N.A., Kolunin R.N.) near Calama. Petrography: Classification (S. Berzin and K. Dugushkina, RAS-UB). Petrographic observation of a polished thin section revealed a fine-grained recrystallized texture and one relict chondrule. The meteorite consists of olivine 65%, orthopyroxene 15%, clinopyroxene 5-7%, plagioclase 10%, chromite 2-3%, troilite 3-4%, Fe-Ni-metal <0.5%. Also contains accessory apatite and ilmenite. Olivine grains are 50-300 µm in size, however large olivine grains up to 800 µm are present. Such olivine grains contain plagioclase, troilite and metal inclusions. One relict barred olivine (BO) chondrule was found in thin section. This chondrule has recrystallized boundaries and contains orthopyroxene and clinopyroxene. This indicates intense recrystallizaton. Optical features (sharp extinction of olivine) indicate that the sample is very weakly or not shocked (S1). There is oxidation of metal and troilite, and incipient alteration of mafic silicates. Geochemistry: EDX analyses and electron microprobe analyses by S. Berzin, K. Dugushkina and I. Danilenko, RAS-UB, analyses Cu isotope composition by M. Chervyakovskaya, RAS-UB. The primary paragenesis includes olivine Fa31±1.5 (N=15), orthopyroxene En73±0.6Fs25±0.6Wo2±0.2 (N=12), plagioclase An20±0.7 (N=9), clinopyroxene En45±1.0Fs11±2.2Wo44±1.2 (N=9), chromite, ilmenite, chlor-apatite, troilite and FeNi-metal. Olivine contains MnO 0.4 wt.%. Plagioclase contains K2O 0.6-1.3 wt.%. The average composition of chromite (N=4): Cr2O3 53.39±0.43%, TiO2 3.77±0.08%, Al2O3 5.17±0.04%, FeO 33.30±0.35%, MgO 1.67±0.07%, MnO 0.43±0.07%, V2O3 0.71±0.03%, ZnO 0.33±0.07%. The average composition of FeNi-metal (N=5): Fe 49.4±1.5%, Ni 49.0±1.5 %, Co 1.99±0.16%. Classification: Ordinary chondrite (LL7). This meteorite has a small content of FeNi-metal (<0.5%) compared to most LL chondrites. Specimens: Main mass 580 g and 10 g cut-offs, plus a thin section, UrFU. | ||||||||||||||||||||||||||||||||||||||
Data from: MB108 Table 0 Line 0: |
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Institutions and collections |
UrFU: Ural Federal University, 620002, 19 Mira street, Ekaterinburg, Russia (institutional address; updated 14 Jan 2015) RAS-UB: Zavaritsky Institute of Geology and Geochemistry Russian Academy of Sciences, Ural Branch 15 Akademika Vonsovskogo str., Ekaterinburg, 620016, Russia (institutional address; updated 19 Apr 2018) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Photos: |
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Geography: |
Statistics: This is 1 of 3384 approved meteorites from Antofagasta, Chile (plus 12 unapproved names) (plus 1 impact crater) This is 1 of 3413 approved meteorites from Chile (plus 13 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||||||||||
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Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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