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Northwest Africa 8649
Basic information Name: Northwest Africa 8649
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8649
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 1680 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  LL3.05
Recommended:  LL3.05    [explanation]

This is 1 of 4 approved meteorites classified as LL3.05.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 3 Dec 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8649 (NWA 8649)

(Northwest Africa)

Purchased: 2014

Classification: Ordinary chondrite (LL3.05)

History: Purchased by Aziz Habibi in Morocco, 2014.

Physical characteristics: A single stone with fusion crust, weathered exterior. Saw cut reveals many densely packed chondrules of variable size; iron-oxidation present.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount and polished deposit sample shows numerous unequilibrated chondrules, apparent mean diameter 602±386 μm (n=105), many with porphyritic, igneously zoned olivines and pyroxenes, most with glass or mesostasis. Abundant fine-grained matrix throughout.

Geochemistry: (C. Agee, N. Muttik, UNM) All chondrule olivine Fa16.9±8.7 (Fa0.8-39.4, n=92); ferroan olivine Fa17.5±8.4, Fe/Mn=46±17, Cr2O3=0.41±0.15 wt%, n=88; low-Ca pyroxene Fs13.3±9.2Wo1.1±1.1, Fe/Mn=28±19, n=47; pigeonite Fs17.3±5.4Wo8.9±2.8, Fe/Mn=29±19, n=3; high-Ca pyroxene Fs17.8±15.1Wo28.8±6.0, Fe/Mn=13±11, n=5. Oxygen isotopes (K. Ziegler, UNM) 12 acid-washed samples of 1.5, 2.1, 1.6, 2.1, 1.8, 1.4, 1.3, 1.3, 2.3, 1.6, 2.1, and 3.5 mg gave δ17O = 2.875, 3.300, 3.713, 2.938, 2.543, 2.623, 3.249, 2.807, 3.217, 3.302, 3.563, 3.518, δ18O = 4.896, 5.022, 5.094, 4.609, 4.203, 4.464, 4.779, 4.639, 4.669, 4.585, 5.659, 5.766, Δ17O = 0.290, 0.648, 1.023, 0.504, 0.324, 0.266, 0.726, 0.358, 0.752, 0.881, 0.575, 0.474 (linearized, all permil).

Classification: Ordinary chondrite (LL3.05), type 3.05 based on ferroan olivine mean Cr2O3 content and sigma from Grossman and Brearley (2005), similar values to MET 00526. Oxygen isotopes appear to be relatively heterogeneous and fall within the same range of δ17O and δ18O as NWA 7731 (Ziegler et al., LPSC, 2014). Weathering grade (W3). Low shock stage.

Specimens: 53.4 g including a probe mount on deposit at UNM, Aziz Habibi holds the main mass.

Bibliography:
  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
  • Ziegler K., Agee C.B., and Connolly H.C. (2014) The oxygen isotope systematics of the L3.00 ordinary chondrite NWA 7731, and a comparison to LL3.00 Semarkona. 45th Lunar and Planetary Science Conference, abstract #2468. (link)
Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2014
Mass (g):1680
Pieces:1
Class:LL3.05
Shock stage:low
Weathering grade:W3
Fayalite (mol%):16.9±8.7
Ferrosilite (mol%):13.3±9.2
Wollastonite (mol%):1.1±1.1
Classifier:C. Agee, UNM
Type spec mass (g):53.4
Type spec location:UNM
Main mass:Aziz Habibi
Comments:Submitted by C. Agee
Plots: O isotopes:  
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6877 approved meteorites from (Northwest Africa) (plus 2037 unapproved names)

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