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Northwest Africa 2737
Basic information Name: Northwest Africa 2737
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2737
Observed fall: No
Year found: 2000
Country: Morocco
Mass:help 611 g
Classification
  history:
Meteoritical Bulletin:  MB 90  (2006)  Martian (chassignite)
Recommended:  Martian (chassignite)    [explanation]

This is 1 of 3 approved meteorites classified as Martian (chassignite).   [show all]
Search for other: Martian meteorites
Comments: Approved 1 Jul 2005
Revised 3 Feb 2006: Revised writeup
Writeuphelp
Writeup from MB 90:

Northwest Africa 2737

Morocco

Find: 2000

Achondrite (Martian, chassignite)

History: In August 2000, meteorite collectors discovered a stone fragmented into nine pieces (308 g, 128 g, 74 g, 47 g, 38 g, 6.4 g, 3.3 g, 2.0 g, and 4.3 g for a total mass of 611 g) in the western part of the Sahara.

Petrography and Geochemistry: (P. Beck, Ph. Gillet, B. Reynard, B. van de Moortele, ENSL; J.A. Barrat, M. Bohn, I. Cotton, UBO) Olivine (Fo78.2–79.1; Mn/Fe = 0.018; ~89.6 vol%), chromite (4.6 vol%), low-Ca pyroxene (En78.5Wo2.7Fs18.8 to En76.6Wo3.2Fs20.2), high-Ca pyroxenes (En73.5Wo8.0Fs18.5 to En64.0Wo22.1Fs13.9; Mn/Fe 0.030 [total of low- and high-Ca pyroxene ~4.1 vol%]), and sanidine glass (~1.6 vol%) with traces of apatite. The texture is that of a cumulate dominated by mm-size anhedral to subhedral olivine crystals, sometimes poikilitically enclosed in augite (En54.6Wo32.8Fs12.6 to En46.7Wo44.1Fs9.2). Oxygen isotopes: (I. Franchi, R. Greenwood, OU) δ17O = 2.40, δ18O = 4.02, ∆17O = 0.315; δ17O = 2.30, δ18O = 3.85, ∆17O = 0.295 (all ‰, n = 2). Furthermore, NWA 2737 displays trace element abundances similar to Chassigny. For example, its REE pattern resembles that of Chassigny but with a more pronounced LREE enrichment.

Classification: Achondrite (Martian, chassignite); highly shocked.

Specimens: A 20 g type specimen is on deposit at ENSL. B. Fectay and C. Bidaut of La Mémoire de la Terre hold the main mass.

Data from:
  MB90
  Table 2
  Line 71:
Place of purchase:Morocco
Date:2000
Mass (g):611
Pieces:9
Class:Martian
Type spec mass (g):20
Plots: O isotopes:  
Institutions
   and collections
ENSL: Ecole Normale Supérieure de Lyon, Laboratoire de Sciences de la Terre, 46 allée d'Italie 69364 Lyon Cedex, France (institutional address; updated 27 Feb 2011)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
Fectay: Bruno Fectay and Carine Bidaut, La Memoire de la Terre SARL, 39800 Aumont, France; Website (private address)
UBO: Institut Universitaire Européen de la Mer, Université de Bretagne Occidentale, place Nicolas Copernic, F-29280 Plouzané Cedex, France (institutional address; updated 23 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Bruno Fectay and Carine Bidaut      
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
ALESSANDRO TAKEDA   
David L. Ribeca   
Francois Pacaud   
Gerald Armstrong   
Jay Piatek   
Jim Strope   
Luis Alexandre Franco Gonçales   
MeteoriteCollector.org - FCOM - Russ Finney   
Michael S. Scherman   
Robert Zdancewicz   
Solar Anamnesis   
Volker Heinrich   
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1223 approved meteorites from Morocco (plus 11 unapproved names)
Synonyms: Diderot (Discredited field name)

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