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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
Classification
  history:
Recommended:  C3-ung    [explanation]

This is 1 of 23 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
Writeuphelp
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:
  MB110
  Table 0
  Line 0:
Place of purchase:Guelmim
Date:P 2018 Oct
Mass (g):40
Pieces:1
Class:C3-ung
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:  
Institutions
   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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Ziyao Wang         
Public domain photographs:
A. Irving   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7795 approved meteorites from (Northwest Africa) (plus 1971 unapproved names)

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