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El Médano 013
Basic information Name: El Médano 013
     This is an OFFICIAL meteorite name.
Abbreviation: EM 013
Observed fall: No
Year found: 2010
Country: Chile
Mass:help 5.2 g
Meteoritical Bulletin:  MB 100  (2012)  CO3
Recommended:  CO3    [explanation]

This is 1 of 621 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 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:
  Table 1
  Line 420:
Origin or pseudonym:deflation surface
Date:2010 Oct 18
Mass (g):5.2
Fayalite (mol%):16.59±16.41
Ferrosilite (mol%):3.03±1.99
Wollastonite (mol%):3.17±1.19
Magnetic suscept.:4.37
Classifier:J. Gattacceca, A. Hutzler, CEREGE
Type spec mass (g):2
Type spec location:CEREGE
Main mass:Chil
Finder:M. Uehara
Comments:Submitted by J. Gattacceca
Plots: O isotopes:  
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
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)
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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     Recommended::   (24° 51'S, 70° 32'W)

     This is 1 of 2370 approved meteorites from Antofagasta, Chile (plus 9 unapproved names) (plus 1 impact crater)
     This is 1 of 2399 approved meteorites from Chile (plus 15 unapproved names) (plus 1 impact crater)
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