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| Calama 078 | |||||||||||||||||||||||||||||||||||||||
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| Basic information | Name: Calama 078 This is an OFFICIAL meteorite name. Abbreviation: There is no official abbreviation for this meteorite. Observed fall: No Year found: 2017 Country: Chile Mass:  1686 g | ||||||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 3179 approved meteorites (plus 1 unapproved name) classified as LL5. [show all] Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||||||||||||
| Comments: | Approved 31 Jan 2020 | ||||||||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 109:
Calama 078 22°22.855’S, 68°35.996’W Antofagasta, Chile Find: 2018 Oct 14 Classification: Ordinary chondrite (LL5) History: One fragment of meteorite (1686.00 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 Chiu-Chiu. Physical characteristics: Total mass is 1686.00 g. The meteorite has roughly rounded shape. Exterior of the stone is desert polished. The surface and interior of the meteorite is light to dark brown in color due to Fe-hydroxides. No fusion crust was observed. Petrography: Classification (K. Dugushkina, RAS-UB). The meteorite consists mostly of a fine-grained inequigranular recrystallized matrix and chondrules (25%). Chondrite consists of olivine 60%, orthopyroxene 20%, clinopyroxene 5-7%, plagioclase 5-7%, chromite 1-2%, troilite 2-3%, Fe-Ni-metal <2%. Also chondrite contains accessory apatite and ilmenite. Predominant porphyritic olivine (PO) and porphyritic olivine-pyroxene (POP) chondrules. Chondrules have vague boundaries. Petrographic type is 5. Chromite-plagioclase assemblages are found in chondrite recrystallized matrix. The assemblages range in size from 10-1000 µm and consist of 0.2-30-µm-size rounded, euhedral, subhedral and anhedral chromite grains surrounded by plagioclase or glass of plagioclase composition. There are grid of thin metal-troilite shock veins in fractures in olivine, pyroxene and plagioclase. Plagioclase is not melted. Shock stage is S2. Moderate oxidation of metal, about 20-60% being affected, alteration of mafic silicates is beginning. Metal and troilite is almost completely oxidized in the grid of thin shock veins. Weathering grade is W2-3. Geochemistry: EDX analyses by K. Dugushkina, RAS-UB. The chondrite paragenesis includes olivine Fa27±0.5 (N=17), orthopyroxene En77±0.3Fs22±0.4Wo1±0.2 (N=11), clinopyroxene En45±0.8Fs20±2.8Wo43±1.2 (N=3), plagioclase An21±2.6 (N=10), chromite, apatite, troilite, kamacite, taenite, ilmenite. The average composition of chromite (N=6): Cr2O3 52.8±1.7%, TiO2 2.9±0.6%, Al2O3 6.5±1.2%, FeO 33.5±1.4%, MgO 3.0±0.9%, SiO2 0.7±0.2. Classification: (Kseniya Dugushkina, RAS-UB) LL5, ordinary chondrite. Specimens: 1676.4 g 2 samples and 9.6 g cut-off and thin section UrFU | ||||||||||||||||||||||||||||||||||||||
| Data from: MB109 Table 0 Line 0: |
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| Institutions and collections |
IGG: Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China (institutional address; updated 16 Oct 2011) 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. 109, in preparation (2020)
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Geography:
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Statistics: This is 1 of 2243 approved meteorites from Antofagasta, Chile (plus 6 unapproved names) (plus 1 impact crater) This is 1 of 2272 approved meteorites from Chile (plus 13 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||||||||||
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