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Erg Chech 007
Basic information Name: Erg Chech 007
     This is an OFFICIAL meteorite name.
Abbreviation: EC 007
Observed fall: No
Year found: 2020
Country: Algeria
Mass:help 8.33 kg
Classification
  history:
Recommended:  Pallasite, PMG-an    [explanation]

This is 1 of 16 approved meteorites classified as Pallasite, PMG-an.   [show all]
Search for other: Main group pallasites, Metal-rich meteorites, and Pallasites
Comments: Approved 1 Oct 2022
Writeuphelp
Writeup from MB 111:

Erg Chech 007 (EC 007)        26.50709, -2.7354

Adrar, Algeria

Purchased: 2020

Classification: Pallasite (Main group, anomalous)

History: Purchased from a dealer in Mauritania in March 2020 found earlier in the year. The recovery coordinates are in the Irg Iguidi Desert.

Physical characteristics: Polished saw cuts show rounded orange-brown, semi-translucent olivines; most in the size range of 5 mm in diameter. Metal makes up approximately 25-30% of this meteorite. There is only minor oxidation present on polished surfaces.

Petrography: (C. Agee, UNM) Olivine is the only silicate phase present. Metal is approximately 80% kamacite and 20 taenite.

Geochemistry: (C. Agee, UNM) Olivine Fa11.9±0.1, Fe/Mn=65±8, MnO=0.18±0.02, n=8; kamacite Fe=94.9±3.0, Ni=6.5±1.2, (wt%), n=6; taenite Fe=79.5, Ni=20.5 (wt%), n=1. Oxygen isotopes (K. Ziegler, UNM): 2 acid-washed fragments analyzed by laser fluorination gave, respectively δ18O= 3.562, 3.535; δ17O= 1.664, 1.648, Δ17O= -0.217, -0.219 (linearized, all per mil, TFL slope=0.528).

Classification: Pallasite, PMG-an. PMG-an based on anomalously high δ18O and Fe/Mn values (low Mn content) in olivine. Fe/Mn mean value of the olivine is higher than Krasnojarsk (PMG-an), see Boesenberg et al. (2021) and Mittlefehldt et al. (1998).

Specimens: 24.52 g on deposit at UNM, DPitt holds the main mass.

Bibliography:
  • Boesenberg J. S., Delaney J. S. and Hewins R. H. (2012) A petrological and chemical reexamination of Main Group pallasite formation. Geochimica et Cosmochimica Acta 89, 134–158. (link)
  • Mittlefehldt D.W., McCoy T.J., Goodrich C.A., and Kracher A. (1998) Non-chondritic meteorites from asteroidal bodies. Reviews in Mineralogy and Geochemistry (1), 4-01 – 4-196. (link)
Data from:
  MB111
  Table 0
  Line 0:
State/Prov/County:Adrar
Place of purchase:Mauritania
Date:P 2020
Latitude:26.50709
Longitude:-2.7354
Mass (g):8.33 kg
Pieces:1
Class:Pallasite, PMG-an
Shock stage:low
Weathering grade:low
Fayalite (mol%):11.9±0.1
Classifier:C. Agee, UNM
Type spec mass (g):24.52
Type spec location:UNM
Main mass:DPitt
Comments:Field name MVCH 501; submitted by C. Agee, UNM
Plots: O isotopes:  
Institutions
   and collections		 UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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Geography:

Algeria
Coordinates:
     Recommended::   (26° 30' 26"N, 2° 44' 7"W)

Statistics:
     This is 1 of 190 approved meteorites from Adrar, Algeria (plus 1 unapproved name)
     This is 1 of 1277 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)
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