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El Médano 350
Basic information Name: El Médano 350
     This is an OFFICIAL meteorite name.
Abbreviation: EM 350
Observed fall: No
Year found: 2013
Country: Chile
Mass:help 135 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 342 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 3 Mar 2017
Writeuphelp
Writeup from MB 106:

El Médano 350 (EM 350)        ~24°51’S, ~70°30’W

Antofagasta, Chile

Find: 2013 Nov 10

Classification: HED achondrite (Eucrite, polymict)

History: The meteorite was found in the Atacama desert by Jihed Dridi on 2013 November 10

Physical characteristics: The stone was found broken in three fitting pieces. It is an almost full oriented stone with fresh glassy fusion crust and flow lines. Cut surface reveals a grey brecciated interior.

Petrography: (J. Gattacceca CEREGE, A. Jambon UPMC) Brecciated magmatic rock composed mostly of plagioclase and pyroxenes, with accessory chromite, silica, olivine, ilmenite, troilite, metal. There three main lithologies: 1) a macroscopically light lithology with fractured ophitic texture and plagioclase and pyroxene grain size to 600 μm; 2) a macroscopically darker lithology with finer grains (typical size 150 μm), more metal and evidence for strong shock; 3) a cataclastic lithology with large plagioclase and pyroxene clasts (to 5 mm), and both exsolved (augite exsolution in pigeonite) and zoned pyroxenes, set in a comminuted matrix of the same minerals. In the dark lithology, brecciation has obliterated the original magmatic teture. Shock evidence include the presence of melt pockets with quenched texture and shock darkening by small metal and sulfide blebs.

Geochemistry: Low-Ca pyroxenes Fs29.8-59.1, average Fs47.1±11.1Wo4.5±1.2, FeO/MnO 30.9±3.4 (N=11). Plagioclase An89.1±4.0Ab10.5±4.0Or0.4±0.2 (N=9). One olivine from a quenched clast is Fa84.9. Magnetic susceptibility log χ (× 10-9 m3/kg) = 3.79 is much higher than the average eucrite (log χ (× 10-9 m3/kg) = 2.95±0.30, measured on 70 falls by Rochette et al. 2009), pointing to an anomalous rich metal content at the level of the Brient polymict eucrite.

Classification: Achondrite (polymict eucrite, metal-rich). Minimal weathering.

Specimens: Type specimen and main mass at CEREGE.

Bibliography:
  • Rochette P., Gattacceca J., Bourot-Denise M., Consolmagno G., Folco L., Kohout T., Pesonen L. and Sagnotti L. (2009) Magnetic classification of stony meteorites: 3. Achondrites. Meteorit. Planet. Sci. 44 405-427. (link)
Data from:
  MB106
  Table 0
  Line 0:
State/Prov/County:Antofagasta
Origin or pseudonym:deflation surface
Date:2013 Nov 10
Latitude:~24°51'S
Longitude:~70°30'W
Mass (g):135
Pieces:3
Class:Eucrite-pmict
Weathering grade:minimal
Ferrosilite (mol%):47.1±11.1 (N=11)
Wollastonite (mol%):4.5±1.2
Magnetic suscept.:3.79
Classifier:J. Gattacceca CEREGE, A. Jambon UPMC
Type spec mass (g):30
Type spec location:CEREGE
Main mass:CEREGE
Finder:Jihed Dridi
Comments:work name M384; submitted by Jérôme Gattacceca
Institutions
   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)
Catalogs:
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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Geography:

Chile
Coordinates:
     Recommended::   (24° 51'S, 70° 30'W)

Statistics:
     This is 1 of 1453 approved meteorites from Antofagasta, Chile (plus 4 unapproved names) (plus 1 impact crater)
     This is 1 of 1480 approved meteorites from Chile (plus 10 unapproved names) (plus 1 impact crater)
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