Meteoritical Bulletin: Entry for Northwest Africa 7949

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Northwest Africa 7949

Basic information

Name: Northwest Africa 7949
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7949
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass: 136 g

Classification
history:

Meteoritical Bulletin:	MB 103	(2014)	CO3
Recommended:			CO3 [explanation]

This is 1 of 642 approved meteorites (plus 1 unapproved name) classified as CO3. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites

Comments:

Approved 26 Jul 2014

Writeup

Writeup from MB 103:

Northwest Africa 7949 (NWA 7949)

(Northwest Africa)

Purchased: 2013 May

Classification: Carbonaceous chondrite (CO3)

History: Purchased by Aaronson in Temara, Morocco in May 2013.

Petrography: (A. Irving and S. Kuehner, UWS) Small (0.1-0.4 mm), well-formed chondrules plus sparse mineral fragments and fine grained, amoeboid CAI occur in a fine-grained matrix containing stained kamacite.

Geochemistry: Olivine (Fa_0.7-40.4, N = 9; Cr₂O₃ in ferroan examples is 0.06-0.11 wt.%, mean 0.08 wt.%, s.d. 0.02 wt.%, N = 7), orthopyroxene (Fs_1.0-3.2Wo_1.0-1.1), augite (Fs_1.2-1.6Wo_45.2-48.7). Oxygen isotopes (D. Rumble, CIW): analyses of acid-washed subsamples gave, respectively δ¹⁷O = -7.85, -6.71; δ¹⁸O = -4.43, -3.43; Δ¹⁷O = -5.515, -4.913 per mil.

Classification: Carbonaceous chondrite (CO3).

Specimens: 20.1 g and one polished thin section are at UWB. The remainder is held by Aaronson.

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Temara
Date:	P 2013 May
Mass (g):	136
Pieces:	1
Class:	CO3
Shock stage:	S2
Weathering grade:	W0/1
Fayalite (mol%):	0.7-40.4
Ferrosilite (mol%):	1.0-3.2
Wollastonite (mol%):	1.0-1.1
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	20.1
Type spec location:	UWB
Main mass:	A. Aaronson
Comments:	M1564; submitted by A. Irving

Plots:

O isotopes:

Institutions
and collections

UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full

Find references in NASA ADS:
Find references in Google Scholar:

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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