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Calama 078
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:help 1686 g
Classification
  history:
Recommended:  LL5    [explanation]

This is 1 of 3150 approved meteorites 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
Writeuphelp
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:
State/Prov/County:Antofagasta
Origin or pseudonym:limestone deflation plain
Date:2017 Oct 14
Latitude:22°22.855'S
Longitude:68°35.996'W
Mass (g):1686.00
Pieces:1
Class:LL5
Shock stage:S2
Weathering grade:W2/3
Fayalite (mol%):27±0.5 (N=17)
Ferrosilite (mol%):22±0.4 (N=11)
Wollastonite (mol%):1±0.2 (N=11)
Classifier:K. Dugushkina, RAS-UB
Type spec mass (g):1686.00
Type spec location:UrFU
Main mass:UrFU
Finder:UrFU
Comments:Field name Lar-2; submitted by Kseniya Dugushkina (IGG UB RAS).; submitted by Kseniya Dugushkina (IGG UB RAS) dugushkina.kseniya@mail.ru
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography:

Chile
Coordinates:
     Recommended::   (22° 22' 51"S, 68° 36' 0"W)

Statistics:
     This is 1 of 1715 approved meteorites from Antofagasta, Chile (plus 5 unapproved names) (plus 1 impact crater)
     This is 1 of 1743 approved meteorites from Chile (plus 11 unapproved names) (plus 1 impact crater)
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