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Northwest Africa 2986
Basic information Name: Northwest Africa 2986
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2986
Observed fall: No
Year found: 2006
Country: Morocco
Mass:help 201 g
Meteoritical Bulletin:  MB 98  (2010)  Shergottite
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 326 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 19 May 2010
Writeup from MB 98:

Northwest Africa 2986 (NWA 2986)


Purchased: 2006

Classification: Martian meteorite (shergottite)

History: Three partially crusted stones with a weight of 201 g were purchased in Erfoud, Morocco, in 2006.

Petrography: (T. Bunch and J. Wittke, NAU): A basaltic shergottite that contains 54 vol% Ca-pyroxene (pigeonite and augite), 41 vol% plagioclase (maskelynite) and minor ulvöspinel, ilmenite, merrillite, chlorapatite, pyrrhotite, and K-Si-rich, late stage glasses. Pyroxene shows mottled compositional zoning. Dark, shock pocket glasses and veins are also present.  A few melt inclusions of K-Si-rich glass, phosphates, ferroan pigeonite, and ilmenite were found in ulvöspinel.

Geochemistry: Pigeonite Fs37.4-53.8Wo10.8-15.8 (FeO/MnO = 34); augite Fs27.8-40.6Wo33.4-36.0; maskelynite An54.7Or1.6.  Oxygen isotopes (D. Rumble, CIW):  Replicate analyses of acid-washed whole rock samples by laser fluorination gave, respectively δ18O = 4.65, 4.59, 4.45, 4.78, δ17O = 2.73, 2.67, 2.58, 2.80, Δ17O = 0.280, 0.260, 0.240, 0.284 (all permil).  Bulk composition (ICPMS, C. Herd, UAb): (mean of 2 replicate analyses, in ppm) La 0.97, Ce 2.32, Nd 1.70, Sm 0.71, Eu 0.43, Gd 1.71, Dy 1.12, Yb 0.85, Lu 0.12, Hf 1.07, Ba 21, Cr 646, V 236, Ni 47, Co 29.

Classification: Martian (shergottite) with an "enriched" chondrite-normalized rare earth element pattern, and probably paired with NWA 2975 and related stones. Low weathering grade and a moderate shock level.

Specimens: 21.3 g is on deposit at NAU*MFarmer and Strope are the main mass holders.

Data from:
  Table 0
  Line 0:
Classifier:T. Bunch and J. Wittke
Type spec location:NAU* type specimen now at UWB. 21.3 g at UWB; remainder with owner.
Comments:Work name 1111, thin sections TGP1 and TGP2
Data from:
  Table 1
  Line 23:
Place of purchase:Erfoud
Date:P 2006
Mass (g):201
Ferrosilite (mol%):37.4 - 53.8
Wollastonite (mol%):10.8 - 15.8
Classifier:T. Bunch and J. Wittke
Type spec mass (g):21.3
Type spec location:NAU*
Main mass:MFarmer, Strope
Comments:Submitted by T. Bunch
Plots: O isotopes:  
   and collections
NAU*: Collection discontinued. Specimens redistributed as shown in individual meteorite records, United States (institutional address; updated 24 Jun 2024)
UAb: 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB, T6G 2E3, Canada, Canada; Website (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, United States; Website (private address)
Strope: 421 Fourth Street, Glen Dale, WV 26038, United States; Website (private address)
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States (institutional address; updated 12 Apr 2012)
References: Published in Meteoritical Bulletin, no. 98, MAPS 45, 1530-1551 (2010)
Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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Photos from the Encyclopedia of Meteorites:
Mike Farmer      
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Charley Butterfield   
Shuo Wang   


     This is 1 of 2093 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater)

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