NWA 11809 - Lunar Impact Melt Breccia - Significant (Ce/Ce<0.8) Negative Anomaly

Description

NWA 11809
NWA 11809
Found Sahara, 2017
Achondrite
Lunar, Feldspathic Impact Melt Breccia
Specimen is a 0.47g slice
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The figure is Rare earth element (REE) concentrations in  3 subsamples of NWA 11809, a feldspathic impact-melt breccia. This is 1 of only 5 lunar meteorites that I know to have a significant (Ce/Ce* <0.8) negative cerium (Ce) anomaly (other 4: NWA 10318, NWA 10495, NWA 11182, and Tichiya). Perhaps related, the Eu concentration is unusually high (Eu/Sm is 1.6x and Eu/Na is 1.2x greater than other meteorites of similar composition). In the figure, Pr and Nd values calculated by interpolation between La and Sm. Dy, Ho, Er, and Tm values interpolated between Tb and Yb. The Gd value is the mean of the La-Sm extrapolation, the Sm-Tb interpolation, and the Yb-Tb extrapolation.
From the Meteoritical society Database :
Northwest Africa 11809
Basic information
Name:
Northwest Africa 11809
This is an OFFICIAL meteorite name.
Abbreviation:
NWA 11809
Observed fall:
No
Year found:
2017
Country:
(Northwest Africa)
Mass:
67 g
Classification
history:
Meteoritical Bulletin:
MB 107
(2018)
Lunar (feldsp. breccia)
Recommended:
Lunar (feldsp. breccia)
Comments:
Approved 28 May 2018
Writeup
Writeup from
MB 107:
Northwest Africa 11809
(NWA 11809)
(Northwest Africa)
Purchased: 2017 Sep
Classification: Lunar meteorite (feldspathic breccia)
History
: Purchased by Fabien
Kuntz
in September 2017 from a dealer in Erfoud, Morocco.
Petrography
: (A. Irving and S. Kuehner,
UWS
) Breccia composed of angular mineral clasts of anorthite, olivine, orthopyroxene, pigeonite, subcalcic augite and Ti-chromite in a finer grained matrix containing minor barite.
Geochemistry
: Olivine (Fa
30.0-41.3
, FeO/MnO = 87-97, N = 3), orthopyroxene (Fs
35.7
Wo
4.2
, FeO/MnO = 56), pigeonite (Fs
25.2-29.8
Wo
7.9-10.1
, FeO/MnO = 52-63, N = 2), subcalcic augite (Fs
15.8
Wo
30.1
, FeO/MnO = 56), anorthite (An
92.0-95.0
Or
0.2-0.1
, N = 2).
Classification
: Lunar (feldspathic breccia).
Specimens
: 14.11 g including a polished slice at
UWB
; main mass with
Kuntz
.
Data from:
MB107
Table 0
Line 0:
Place of purchase:
Erfoud
Date:
P 2017 Sep
Mass (g):
67
Pieces:
1
Class:
Lunar (feldsp. breccia)
Shock stage:
low
Weathering grade:
low
Fayalite (mol%):
30.0-41.3
Ferrosilite (mol%):
25.2-35.7
Wollastonite (mol%):
7.9-4.2
Classifier:
A. Irving and S. Kuehner, UWS
Type spec mass (g):
14.11
Type spec location:
UWB
Main mass:
F. Kuntz
Comments:
K371; submitted by A. Irving
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)
UWB
: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Kuntz
: Fabien Kuntz, France;
Website
(private address)
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