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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
Classification
  history:
Meteoritical Bulletin:  MB 98  (2010)  Shergottite
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 279 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 19 May 2010
Writeuphelp
Writeup from MB 98:

Northwest Africa 2986 (NWA 2986)

Morocco

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 NAUMFarmer and Strope are the main mass holders.

Data from:
  MB98
  Table 1
  Line 23:
Place of purchase:Erfoud
Date:P 2006
Mass (g):201
Pieces:3
Class:Shergottite
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:  
Institutions
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
UAb: 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB, T6G 2E3, Canada, Canada; Website (institutional address; updated 17 Oct 2011)
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 98, MAPS 45, 1530-1551 (2010)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
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   
Gerald Armstrong Photo added 19 Apr 2022
Photo added 19 Apr 2022
Jim Strope Photo added 19 Apr 2022
Meteor-Center Photo added 19 Apr 2022
MeteoriteCollector.org - FCOM - Russ Finney Photo added 19 Apr 2022
Shuo Wang   
Woreczko Jan & Wadi Photo added 19 Apr 2022
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1852 approved meteorites from Morocco (plus 24 unapproved names) (plus 1 impact crater)

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