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Northwest Africa 1645 | |||||||||||||||||||
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Basic information | Name: Northwest Africa 1645 This is an OFFICIAL meteorite name. Abbreviation: NWA 1645 Observed fall: No Year found: 2002 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||
Classification history: |
This is 1 of 7 approved meteorites classified as Mesosiderite-B. [show all] Search for other: Class B mesosiderites, Mesosiderites, and Metal-rich meteorites | ||||||||||||||||||
Writeup![]() |
Writeup from MB 88:
Northwest Africa 1645 Morocco Purchased 2002 April Mesosiderite A very fresh, complete stony-iron meteorite of 129 g was purchased from a dealer in Rissani by M. Farmer in 2002 April. Classification and mineralogy (A. Irving and S. Kuehner, UWS): Medium-grained, relatively homogeneous assemblage of orthopyroxene (45%), plagioclase (15%), metal (20%), troilite (12%), chromite (8%) and accessory merrillite, with an unbrecciated, plutonic igneous texture. The two-phase Fe-Ni metal grains consist of rounded regions of taenite (30 wt% Ni) within kamacite (5 wt% Ni). Compositions of orthopyroxene (Fs29.8-31.0Wo3.1-3.5, FeO/MnO = 26.9-30.3) and plagioclase (An89.7-90.5Or0.3-0.6) are consistent with those in mesosiderites assigned to class B. Oxygen isotopes (D. Rumble, CIW): replicate analyses of acid-washed silicate material by laser fluorination gave δ18O = 3.79‰, δ17O = 1.76‰, Δ17O = -0.25 ± 0.02‰. Specimens: type specimens, 20 g and one polished thin section, UWS; main mass, MFarmer. | ||||||||||||||||||
Data from: MB88 Table 4 Line 14: |
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Plots: | O isotopes: | ||||||||||||||||||
Institutions and collections |
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012) 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) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 88, MAPS 39, A215-A272 (2004)
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Geography: |
Statistics: This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names) |