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Northwest Africa 13984
Basic information Name: Northwest Africa 13984
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13984
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 40 g
Recommended:  C3-ung    [explanation]

This is 1 of 27 approved meteorites classified as C3-ung.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), and Ungrouped chondrites
Comments: Approved 21 Jun 2021
Writeup from MB 110:

Northwest Africa 13984 (NWA 13984)

(Northwest Africa)

Purchased: 2018 Oct

Classification: Carbonaceous chondrite (C3, ungrouped)

History: Purchased by Ziyao Wang in October 2018 from a dealer in Guelmim, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL; L. Garvie, ASU) Well-formed small chondrules (apparent diameter 290 ± 150 µm, N = 20) are set in a fine grained matrix (black in thin section). No CAI were observed; however, rare isolated grains of highly aluminous enstatite and diopside are present. Accessory phases identified by electron microprobe analysis are kamacite, tetrataenite (with Ni>Fe), Fe sulfide and a Cr-Fe metal or oxide phase (with a small V peak, but without Mg and Al). X-ray diffraction analysis found olivine (with a wide range of in Fa contents), enstatite, magnetite, possible maghemite, calcite, dolomite, pyrrhotite and pentlandite, but no phyllosilicates.

Geochemistry: Olivine (Fa28.6±21.7, range Fa0.6-80.0, N = 20; Cr2O3 in ferroan olivine 0.23-0.38 wt.%, N = 16), enstatite (Fs1.5Wo1.0), aluminous enstatite (Fs1.1Wo3.2, Al2O3 = 15.7 wt.%, TiO2 = 0.5 wt.%), pigeonite (Fs7.3Wo7.9), diopside (Fs1.3±0.7Wo43.2±1.7, range Fs0.7-2.1Wo41.6-44.9, Al2O3 2.2-13.9 wt.%, N = 3). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively, δ17O -8.610, -5.847, -8.477; δ18O -4.172, -1.364, -4.177; Δ17O -6.407, -5.127, -6.272 per mil (all data linearized).

Classification: Carbonaceous chondrite (C3-ungrouped). Type 3 based on the absence of phyllosilicates. Ungrouped designation based on the oxygen isotopic composition that plot sbelow the CCAM trend, near results for ungrouped C3 chondrite NWA 13671.

Specimens: 8.5 g including one polished thin section at UWB; remainder with WangZ.

Data from:
  Table 0
  Line 0:
Place of purchase:Guelmim
Date:P 2018 Oct
Mass (g):40
Shock stage:S1
Weathering grade:low
Fayalite (mol%):28.6±21.7
Ferrosilite (mol%):1.1; 1.5; 7.3; 1.3±0.7
Wollastonite (mol%):1.0; 3.2; 7.9; 43.2±1.7
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):8.5
Type spec location:UWB
Main mass:WangZ
Comments:Work name WZY-11; submitted by A. Irving
Plots: O isotopes:  
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
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)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
WangZ: Ziyao Wang, Hebei GEO University North Campus, Huai An dong road 127, Shijiazhuang, Hebei Province , China (private address; updated 25 Jun 2021)
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Ziyao Wang         
Public domain photographs:
A. Irving   

     This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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