Meteoritical Bulletin: Entry for El Médano 301

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El Médano 301

Basic information

Name: El Médano 301
This is an OFFICIAL meteorite name.
Abbreviation: EM 301
Observed fall: No
Year found: 2013
Country: Chile
Mass: 17.9 g

Classification
history:

Meteoritical Bulletin:	MB 105	(2016)	Chondrite-ung
Recommended:			Chondrite-ung [explanation]

This is 1 of 22 approved meteorites classified as Chondrite-ung. [show all]
Search for other: Ungrouped chondrites

Comments:

Approved 26 Mar 2016

Writeup

help

Writeup from MB 105:

El Médano 301 ~24°51’S, ~70°32’W

Antofagasta, Chile

Find: 2013 Nov 09

Classification: Ungrouped chondrite

History: Two stones were found 1 m apart in the Atacama desert by Pierre Rochette on November 4, 2013.

Physical characteristics: A single brown stone without fusion crust

Petrography: Closely packed, well-defined chondrules with average apparent diameter 490±330 μm (N=60). Main minerals are olivine (forsterite), enstatite, diopside, chlorapatite, chromite, troilite, kamacite, taenite. Metal and sulfides have been extensively replaced by weathering products.

Geochemistry: Olivine Fa_3.9±0.4(Fa_3.6-5.0, PMD 5.5%, FeO/MnO=8.0±1.3, N=10), Cr₂O₃ 0.02±0.03 wt%. Orthopyroxene Fs_13.1±5.7(Fs_6.6-21.0, PMD=40%, N=11). Oxygen isotopic composition (J. Gattacceca, C. Sonzogni, CEREGE) is δ¹⁷O = 3.58 ‰, δ¹⁸O = 5.38 ‰, Δ¹⁷O = 0.78‰ (analysis of one 1.5 mg sample of hand-picked separated silicates after acid cleaning). Magnetic susceptiblity log χ (× 10^-9 m³/kg)=4.62.

Classification: Chondrite-ung. With Fa_3.6-5.0, this meteorite has affinities with NWA 7135 that has Fa_4.8-6.3and similar oxygen isotope composition, although NWA 7135 is more reduced, with occurrence of schreibersite and oldhamite.

Specimens: Polished section, main mass and type specimen at CEREGE

Data from:
  MB105
  Table 0
  Line 0:

State/Prov/County:	Antofagasta
Origin or pseudonym:	deflation surface
Date:	2013 Nov 09
Latitude:	~24°51'S
Longitude:	~70°32'W
Mass (g):	17.9
Pieces:	2
Class:	Chondrite-ung
Weathering grade:	W4
Fayalite (mol%):	3.9±0.4 (N=10)
Ferrosilite (mol%):	13.1±5.7 (N=11)
Wollastonite (mol%):	0.9±0.4 (N=11)
Magnetic suscept.:	4.62
Classifier:	J. Gattacceca, H. Pourkhorsandi, B. Devouard
Type spec mass (g):	10
Type spec location:	CEREGE
Main mass:	CEREGE
Finder:	Pierre Rochette
Comments:	Submitted by J. Gattacceca

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)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full

Find references in NASA ADS:
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Geography:

Chile

Chile

Coordinates:
Recommended::	(24° 51'S, 70° 32'W)

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)

Proximity search:

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