Meteoritical Bulletin: Entry for Northwest Africa 7306

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Northwest Africa 7306

Basic information

Name: Northwest Africa 7306
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7306
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 54.7 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	CM-an
Recommended:			CM-an [explanation]

This is 1 of 10 approved meteorites classified as CM-an. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites

Comments:

Approved 6 Sep 2013

Writeup

help

Writeup from MB 102:

Northwest Africa 7306 (NWA 7306)

(Northwest Africa)

Purchased: 2011 Mar

Classification: Carbonaceous chondrite (CM, anomalous)

History: Purchased by Gary Fujihara in March 2011 from a dealer in Zagora, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Tiny (typically <0.2 mm) chondrules (some with dust rims) and sparse mineral fragments (olivine, orthopyroxene) are set in an abundant, black, very fine grained matrix composed of unresolvable mafic silicates, abundant troilite (some in polycrystalline clusters) and taenite.

Geochemistry: Olivine (in chondrules Fa_3.4-4.3; angular grain Fa_32.1), orthopyroxene (in chondrules Fs_1.8-3.0Wo_1.4-0.9; angular grain Fs_7.7Wo_3.7). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively δ¹⁷O = 3.073, 2.295; δ¹⁸O = 8.232, 7.052; Δ¹⁷O = -1.273, -1.428 per mil (for a TFL slope of 0.528). These values do not plot on any established trends and lie above the trend for CM chondrites.

Classification: Carbonaceous chondrite, CM, anomalous based on the elevated Δ¹⁷O relative to the main CM2 field.

Data from:
  MB102
  Table 0
  Line 0:

Place of purchase:	Zagora
Date:	P 2011 Mar
Mass (g):	54.7
Pieces:	3
Class:	CM-an
Shock stage:	S2
Weathering grade:	W0/1
Fayalite (mol%):	3.4-4.3
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	11
Type spec location:	UWB
Main mass:	G. Fujihara
Comments:	GF12-1; submitted by A. Irving

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)
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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015

Find references in NASA ADS:
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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Anthony James
Jean-Michel Masson

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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