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| El Médano 013 | |||||||||||||||||||||||||||||||||||||
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| Basic information | Name: El Médano 013 This is an OFFICIAL meteorite name. Abbreviation: EM 013 Observed fall: No Year found: 2010 Country: Chile Mass:  5.2 g | ||||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 645 approved meteorites (plus 1 unapproved name) classified as CO3. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites | ||||||||||||||||||||||||||||||||||||
| Comments: | Approved 24 Oct 2011 | ||||||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 100:
El Médano 013 24°51’S, 70°32’W Antofagasta, Chile Found: 2010 Oct 18 Classification: Carbonaceous chondrite (CO3) History: A single stone was found on a deflation surface in the Atacama Desert, northern Chile, by Minoru Uehara (CEREGE) during the 2010 CEREGE-Universidad de Chile scientific expedition. This is the second carbonaceous chondrite found in the Chilean territory. Physical characteristics: (J. Gattacceca, CEREGE) A single stone of 5.2 g without fusion crust and a smooth brownish outer surface. The interior has the same dark brown color. Petrography: (J. Gattacceca, CEREGE) Abundant chondrules (~50% vol), predominantly of type I in a dark matrix (~40% vol). Chondrule size ranges from a <100 μm up to 1.5 mm, with a median diameter of 200 μm. Geochemistry: Olivine Fa0.31-Fa47.98 (mean Fa16.57±16.41, PMD=88.9, n=28). Low-Ca pyroxenes are in the range Fs1.21-6.80 (mean Fs3.03±1.99, PMD=52.0, n=5), mean Wo3.17±1.19. Cr2O3 in ferroan olivine is 0.25±0.20 wt% (n=19) indicating a metamorphic type 3.1. Grain density is 3.21 g/cm3. Magnetic susceptibility log χ = 4.37 (χ in 10-9 m3/kg) indicates maximum metallic FeNi content of 4 wt%. Oxygen isotopic composition (J. Gattacceca, C. Sonzogni, CEREGE) is δ17O = -6.52, δ18O = -3.68, and Δ17O = -4.60 per mil (analysis of one acid-washed 1.5 mg bulk sample). Classification: Carbonaceous chondrite (CO3.1). Moderate weathering Specimens: 2 g and one polished section are on deposit at CEREGE. Main mass at Chil. | ||||||||||||||||||||||||||||||||||||
| Data from: MB100 Table 1 Line 420: |
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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) Chil: Departamento de Geología Facultad de Cs. Fís. y Matem. Universidad de Chile Plaza Ercilla 803 Santiago, Chile 8370450, Chile (institutional address; updated 28 Feb 2021) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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Geography:
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Statistics: This is 1 of 3440 approved meteorites from Antofagasta, Chile (plus 12 unapproved names) (plus 1 impact crater) This is 1 of 3469 approved meteorites from Chile (plus 13 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||||||||
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| Revision history: |
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