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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:
Meteoritical Bulletin:  MB 111  (2023)  Pallasite, PMG-an
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 Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Geography:

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

Statistics:
     This is 1 of 201 approved meteorites from Adrar, Algeria (plus 1 unapproved name)
     This is 1 of 1356 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters)
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