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Northwest Africa 1460
Basic information Name: Northwest Africa 1460
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 1460
Observed fall: No
Year found: 2002
Country: (Northwest Africa)
Mass:help 70.2 g
Classification
  history:
Meteoritical Bulletin:  MB 90  (2006)  Martian (basaltic shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 192 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Corrected find year to 2002, 17 apr 2008
Approved 3 Feb 2006
Writeuphelp
Writeup from MB 90:

Northwest Africa 1460

Morocco

Find: June 2002

Achondrite (Martian, basaltic shergottite)

History: In January 2002, A. Habibi provided several small fragments of a 70.2 g complete stone with a fresh, black fusion crust to A. and G. Hupé for analysis. N. Oakes later purchased the stone for more detailed investigation.

Physical Characteristics: A complete stone weighing 70.2 g with a fresh black fusion crust. Dimensions of the stone are 47 × 34 × 27 mm.

Petrography: (A. Irving and S. Kuehner, UWS) The stone is largely unweathered and coarse-grained, with large, pale yellow-green pyroxene and glassy maskelynite laths clearly visible. Texture is subophitic to intersertal.

Geochemistry: Pyroxenes are zoned with cores of orthopyroxene (Fs20Wo3; FeO/MnO = 30.7) mantled by augite (Fs27Wo31; FeO/MnO = 32.2) with rims of Fe-rich pigeonite (Fs55Wo18 to Fs85Wo13; FeO/MnO = 41.0–36.8). Plagioclase (Ab51Or1–2, maskelynite) has patchy compositional zoning. Accessory minerals are merrillite, Cl-F-bearing apatite, exsolved Fe-Ti oxides (ilmenite lamellae in titanomagnetite), ilmenite, chromite, pyrrhotite, K-rich glass, silica, and baddeleyite (occurs as blades up to 50 µm long). Fine-grained symplectitic intergrowths composed of fayalite+silica+hedenbergite occurs at the margins of pigeonite grains. Other symplectitic intergrowths of fayalite+silica also occur, commonly at the boundaries between merrillite and pyroxene. Textures, mineralogy, and mineral compositions are essentially identical to NWA 480, with which this sample is paired. Cosmogenic isotopes: (K. Nishiizumi, SSL) Give a cosmic ray exposure age of 2.6 ± 0.2 Ma. Radiogenic isotopes and formation age: (L. Nyquist and C.-Y. Shih, JSC) A preliminary Sm-Nd isochron age of 352 ± 30 Ma and a Rb-Sr isochron age of 313 ± 3 Ma.

Classification: Achondrite (Martian, basaltic shergottite); minimal weathering.

Specimens: A 2.5 g type specimen is on deposit at JSC. A 2.6 g type specimen and one polished thin section are on deposit at MNB. A 5.7 g type specimen and two polished thin sections are on deposit at UWS. A 3.5 g type specimen is on deposit at NAU. An anonymous collector holds the main mass.

Data from:
  MB90
  Table 2
  Line 4:
Place of purchase:Morocco
Date:June 2002
Mass (g):70.2
Pieces:1
Class:Martian
Weathering grade:minimal
Type spec mass (g):Various
Comments:Find date was printed incorrectly. 2002 is correct.
Institutions
   and collections
JSC: Mailcode KT, 2101 NASA Parkway, NASA Johnson Space Center, Houston, TX 77058, United States; Website (institutional address; updated 3 Sep 2013)
MNB: Museum für Naturkunde, Invalidenstrasse 43, D-10115 Berlin, Germany (institutional address)
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Oakes: Nelson Oakes, Route 1, House 50C, Uniondale, PA 18470, United States; Website (private address)
SSL: Space Sciences Laboratory, University of California, Berkeley, CA 94720-7450, United States (institutional address)
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:
Nelson Oakes   
The Hupe Collection   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6916 approved meteorites from (Northwest Africa) (plus 2027 unapproved names)

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