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Northwest Africa 2043
Basic information Name: Northwest Africa 2043
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2043
Observed fall: No
Year found: 2003
Country: (Northwest Africa)
Mass:help 34.9 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  CK3
Recommended:  CK3    [explanation]

This is 1 of 39 approved meteorites classified as CK3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CK chondrites, CK3 chondrites, and CV-CK clan chondrites
Comments: Approved 12 Apr 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 2043 (NWA 2043)

(Northwest Africa)

Purchased: 2003 Aug

Classification: Carbonaceous chondrite (CK3)

History: Purchased from a Moroccan dealer in Erfoud for D. Gregory in August 2003.

Physical characteristics: A single dark green, friable stone weighing 34.9 g.

Petrography: (A. Irving and S. Kuehner, UWS; T. Bunch, NAU) Sparse, relatively small (up to 0.6 mm across), well-formed POP chondrules and ellipsoidal oxide-sulfide-rich objects (0.030-0.140 mm diameter, some within chondrules) in a dark, porous matrix. Olivine in chondrules is compositionally zoned, and pyroxene has pigeonite cores mantled by orthopyroxene. The oxide-sulfide-rich objects are composed predominantly of Cr-bearing magnetite and Ni-bearing pyrrhotite with accessory djerfisherite and chlorapatite. One small object composed of Al-rich, Cr-bearing spinel and chlorapatite may be a type of CAI. The unrecrystallized matrix consists of olivine and lath-like aggregates of plagioclase, aluminous orthopyroxene and aluminous pigeonite, with apparently primary porosity.

Geochemistry: Olivine (Fa18.4-33.8, mean Fa30, FeO/MnO = 54-124), orthopyroxene (Fs23.8-24.1Wo0.4-0.5, FeO/MnO = 79.4-85.1, Al2O3 = 4.0-4.6 wt.%), pigeonite cores (Fs1.7-1.9Wo11.2-10.7, FeO/MnO = 3.2-3.4, Al2O3 = 1.6-2.7 wt.%), plagioclase (An32.2Or2.0). Oxygen isotopes (D. Rumble, CIW): analyses of two acid-washed whole rock fragments by laser fluorination gave, respectively, δ18O = -0.84, -0.97; δ17O = -3.88, -4.08; Δ17O = -3.441, -3.576 per mil.

Classification: Carbonaceous chondrite (CK3). The oxygen isotopic composition of this specimen is ambiguous, since it plots near the trends for CM, CO and CK chondrites. Although this composition lies above the trend defined by CK chondrites such as NWA 1665, NWA 1905, NWA 3155 and NWA 4800, the presence of chromian magnetite, lack of metal and lack of primary hydrous phases in NWA 2043 all imply an affinity with CK chondrites rather than CO or CM chondrites.

Specimens: A total of 5.7 g, one polished thin section prepared from it, and one polished mount are on deposit at UWS; the remaining 28.5 g main mass is archived at ROM.

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2003 Aug
Mass (g):34.9
Pieces:1
Class:CK3
Shock stage:S1
Weathering grade:W0
Fayalite (mol%):18.4-33.8
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):7
Type spec location:UWB
Main mass:ROM
Comments:DGH41; submitted by A. Irving
Plots: O isotopes:  
Institutions
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
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)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
Gregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6877 approved meteorites from (Northwest Africa) (plus 2037 unapproved names)

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