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| El Médano 100 | |||||||||||||||||||||||||||||||||||||||
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| Basic information | Name: El Médano 100 This is an OFFICIAL meteorite name. Abbreviation: EM 100 Observed fall: No Year found: 2011 Country: Chile Mass:  1.8 g | ||||||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 28 approved meteorites classified as C2-ung. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and Ungrouped chondrites | ||||||||||||||||||||||||||||||||||||||
| Comments: | Approved 1 Mar 2013 | ||||||||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 102:
El Médano 100 24°51’S, 70°32’W Antofagasta, Chile Found: 2011 Oct 24 Classification: Carbonaceous chondrite (C2, ungrouped) History: The meteorite was found in the Atacama desert by Cécile Cournède in October 2011 during a systematic search for meteorites. Physical characteristics: A single broken stone with fresh black fusion crust and light brown interior. Petrography: (J. Gattacceca, CEREGE) Small chondrules (average 250 μm) and mineral fragments set in a phyllosilicate-rich matrix. Modal abundances: matrix 70%, chondrules and mineral fragments 23%, sulfides ~1 %. Rare kamacite. Powder x-ray diffraction shows an abundance of serpentine in the matrix. Geochemistry: Olivine Fa0.6-35.2 (mean 7.3±12.1, N=23), Cr2O3 in ferroan olivine is 0.39 wt.% (n=13), orthopyroxene Fs0.9-8.1Wo2.3-0.9 (mean Fs 3.7±2.8, mean Wo 0.9±0.1 , N=7). Oxygen isotopic compositions: (J. Gattacceca and C. Sonzogni, CEREGE) analysis of a 1.5 mg acid-washed sample by laser fluorination gave δ17O = -10.29; δ18O = -7.59; Δ17O = -6.35 (all per mil). Mag susceptibilty log χ =3.93 (χ in 10-9 m3/kg). Classification: Carbonaceous chondrite (C2-ung); moderate weathering. Specimens: 1 gram and a polished section are on deposit at CEREGE. A polished section is at MNHN. | ||||||||||||||||||||||||||||||||||||||
| Data from: MB102 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) MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address) MNHN: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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Geography:
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Statistics: This is 1 of 3632 approved meteorites from Antofagasta, Chile (plus 12 unapproved names) (plus 1 impact crater) This is 1 of 3661 approved meteorites from Chile (plus 13 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||||||||||
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