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Northwest Africa 10084
Basic information Name: Northwest Africa 10084
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10084
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 14.8 g
Meteoritical Bulletin:  MB 104  (2015)  L-imp melt
Recommended:  L-imp melt    [explanation]

This is 1 of 30 approved meteorites classified as L-imp melt.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 28 Jun 2015
Writeup from MB 104:

Northwest Africa 10084 (NWA 10084)

(Northwest Africa)

Purchased: 2015

Classification: Ordinary chondrite (L, impact melt)

History: Purchased by Luc Labenne from Aziz Habibi in Tucson, 2015.

Physical characteristics: Single stone with smooth black fusion crust. Saw cut reveals a high density of very fine-grained, light-colored crystals set in a dark-gray groundmass, with a few opaque grains scattered throughout.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a microporphyry with ~50 vol.% olivine grains suspended in ~40 vol.% quench melt. Accessory phases observed are FeNi-metal, Fe-sulfide, chromite, and low-Ca pyroxene. Average olivine grain size is approximately 100 μm. The quench melt consists of μm to sub-μm scale dendritic crystals and glass.

Geochemistry: (C. Agee and N. Muttik, UNM) Olivine Fa25.2±0.4, Fe/Mn=49±2, n=24; low Ca pyroxene Fs23.1±2.6Wo1.9±1.8, Fe/Mn=29±3, n=3. Quench melt (20 μm defocused electron beam): SiO2=57.8±1.4, TiO2=0.31±0.05, Al2O3=6.9±0.8, Cr2O3=0.83±0.46, MgO=12.9±2.0, FeO=8.9±2.0, MnO=0.29±0.05, CaO=7.0±1.6, NiO=0.07±0.08, Na2O=2.9±0.6, K2O=1.2±0.2 (all wt%), Fe/Mn=31±7 (molar), Mg#=72±5, K/Na=0.5±0.1 (wt), CaO/Al2O3=1.0±0.3 (wt), n=41. Oxygen isotopes (K. Ziegler, UNM): acid-washed material analyzed in 3 replicates by laser fluorination gave, respectively δ18O=4.567, 4.452, 4.260; δ17O=3.501, 3.456, 3.342; Δ17O=1.090, 1.105, 1.093 (linearized, all per mil). Magnetic susceptibility (J. Gattacceca, CEREGE) log χ =4.18 (χ in 10-9 m3/kg).

Classification: L-impact melt. This meteorite has oxygen isotopes that plot on the slope-1 line, above the terrestrial fractionation line, suggesting an affinity to ordinary chondrites. However the quench-melt phase in this meteorite, which is compositionally equivalent to a terrestrial boninite, is enriched in K and depleted in Al with super-chondritic K/Na and Ca/Al.

Specimens: 3.0 g including a probe mount on deposit at UNM, Labenne holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2015
Mass (g):14.8
Class:L-imp melt
Shock stage:low
Weathering grade:low
Fayalite (mol%):25.2±0.4
Ferrosilite (mol%):23.1±2.6
Wollastonite (mol%):1.9±1.8
Magnetic suscept.:4.18
Classifier:C. Agee, UNM
Type spec mass (g):3.0
Type spec location:UNM
Main mass:Luc Labenne
Comments:Submitted by C. Agee
Plots: O isotopes:  
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     This is 1 of 7328 approved meteorites from (Northwest Africa) (plus 1973 unapproved names)

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