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| Calama 451 | |||||||||||||||||||||||||||||||||||||||
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| Basic information | Name: Calama 451 This is an OFFICIAL meteorite name. Abbreviation: There is no official abbreviation for this meteorite. Observed fall: No Year found: 2021 Country: Chile Mass:  22.3 g | ||||||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 11 approved meteorites classified as OC3. [show all] Search for other: Ordinary chondrites, Ordinary chondrites (type 3) | ||||||||||||||||||||||||||||||||||||||
| Comments: | Approved 10 Nov 2023 | ||||||||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 112:
Calama 451 22°27.59’S, 68°48.86’W Antofagasta, Chile Find: 21 Mar 2021 Classification: Ordinary chondrite (type 3) History: one piece of the meteorite was found in the desert of Chile. Physical characteristics: the meteorite has a brown fusion crust Petrography: M. A. Ivanova, C.A. Lorenz (Vernad.) Meteorite consists of densely packed chondrules and chondrule fragments. Interchondrule space is filled by fine-grained troilite-silicate matrix containing troilite veinlets, silicate fragments and Fe,Ni-metal grains. Metal content is 3.4±1.2 vol%. Rare troilite and metal veins cross the rock. Chondrules (D=575±316 mm, N=100) are well-delineated and represented by RP, ROP, PO, POP, CC and rare BO types. The chondrule mesostasis contains isotropic glass. Olivine has undulatory extinction and irregular fractures corresponding to a shock stage S2. Weathering grade is W1. Petrologic type is estimated at 3.9. Geochemistry: Mineral compositions and geochemistry: M. A. Ivanova (Vernad), N.G. Zinovievz (MSU). Olivine: Fa 10.6±2.8 (N=40), Fa PMD 8%; orthopyroxene: Fs 13.4±6.0Wo 1.75±1.70), Fe/Mn = 22.6 ± 10.1 (N=38); Ca-pyroxene is represented by pigeonite and augite. Plagioclase has variable composition (Ab83.7±10.4An12.0±10.9); Fe,Ni-metal is represented by low-Ni and high-Ni phases. Low-Ni metal contains 0.01±0.01 wt% Si, 6.6±1.0 wt% Ni, 0.58±0.03 wt% Co. Sulfide is represented by Cr-rich troilite. Among oxides the meteorites contains rutile, ilmenite, armolkolite, spinel and chromite. Oxygen isotopic composition (J. Gattacceca, C. Sonzogni, D. Au Yang, CEREGE) from analysis of one acid-washed 1.70 mg aliquot of a powdered 94 mg bulk sample is δ17O=3.999‰, δ18O=6.126‰ , Δ17O=0.813 (slope 0.52, analytical uncertainties 0.115‰, 0.062‰, 0.005‰ respectively). Classification: based on very reduced olivine composition (Fa10.6 ± 2.8), and oxygen isotopic composition corresponding to LL chondrite composition, the meteorite is a reduced, ungrouped ordinary chondrite. Specimens: a fragment of meteorite (4.5 g) and 1 polished section are deposited in Vernad. | ||||||||||||||||||||||||||||||||||||||
| Data from: MB112 Table 0 Line 0: |
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| Plots: | O isotopes: | ||||||||||||||||||||||||||||||||||||||
| Institutions and collections |
CEREGE: CEREGE
BP 80
Avenue Philibert, Technopole de l'Arbois
13545 Aix-en-Provence Cedex 4
France, France (institutional address; updated 10 Jun 2023) Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016) |
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| References: | Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Cartier C., Consolmagno G., Goodrich C., Greshake A., Gross J., Joy K. H., Miao B. and Zhang B. (2024) The Meteoritical Bulletin, no. 112. Meteoritics & Planetary Science 59, 1820–1823. ?
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Geography:
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Statistics: This is 1 of 3638 approved meteorites from Antofagasta, Chile (plus 12 unapproved names) (plus 1 impact crater) This is 1 of 3667 approved meteorites from Chile (plus 13 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||||||||||
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