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Lunar Meteorite
Larkman Nunatak 06638
Antarctica
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Larkman
Nunatak 06638
(photo
credit: NASA)
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Small
samples of LAR 06638. Millimeter ticks for scale.
(photo
credit: Randy Korotev)
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Back-scattered
electron image (gray-scale) and a red-green-blue elemental x-ray map of a
thin section of LAR 06638. In BSE images, brightness increases with mean
atomic mass. The darkest areas are rich in plagioclase (Al) and the
lightest areas are rich in mafic (Fe-bearing) minerals. In the X-ray map,
areas rich in Al (e.g., plagioclase) are bright red, areas rich in Mg are
bright green (e.g., olivine), and areas rich in Fe (e.g., pyroxene or FeNi
metal) are bright blue. Notice that there are three different layers of
glass coating, not all of which may be fusion crust in that the two inner
ones have differnt compositions. The scale bar
applies to the BSE image.
(image
credit: Ryan Zeigler)
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Listed
in from The Meteoritical Bulletin, No. 94, September 2008. Meteoritics &
Planetary Science 43,
1551–1588 (2008)
Classification
from Antarctic
Meteorite Newsletter,
Vol. 30, No. 2, 2007
LAR 06638
Sample
No.: LAR 06638
Location: Larkman Nunatak
Field No.: 19362
Dimensions (cm): 2.5 x 2.0 x 0.75
Mass: 5.293 g
Lunar-Anorth. Breccia
Macroscopic
Description:
Kathleen McBride The bottom exterior surface has black fusion crust, while
the top has a lighter brown crust. Polygonal fractures are present. The
gray and white matrix has a sharp line where matrix becomes black with
white inclusions.
Thin Section (,2)
Description: Tim McCoy, Lauren LaCroix
and Linda Welzenbach. The section shows a
groundmass of comminuted pyroxene, olivine and plagioclase with grain sizes
up to 1 mm. Clasts up to 2 mm include basalts, granulites and anorthosites.
One-half of the section exhibits a darkened matrix. Olivine is Fa28-33,
pyroxene ranges from Fs27-39Wo3-12 (Fe/Mn ~ 60), and
plagioclase An93-98. The meteorite is lunar, probably an
anorthositic regolith breccia.
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Randy
Says…
Compositionally,
LAR 06638 is a typical feldspathic lunar meteorite.
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More
Information
Meteoritical
Bulletin Database
LAR 06638
Map
ANSMET Location Map
References
Korotev R. L. and Zeigler R.
A. (2014) Chapter 6. ANSMET Meteorites from the Moon, Thirty-five Seasons of U.S. Antarctic Meteorites
(1976–2010): A Pictorial Guide to the Collection (editors K. Righter, R. P.
Harvey, C. M. Corrigan, and T. J. McCoy), 101–130, Special Publications 68,
American Geophysical Union, Washington, D. C., 296 pages, ISBN:
978-1-118-79832-4.
Korotev R. L., Irving A. J.,
and Bunch T. E. (2008) Keeping up with
the lunar meteorites - 2008. Lunar
and Planetary Science XXXIX, abstract no. 1209.
Korotev R. L., Jolliff B. L.,
and Zeigler R. A. (2010) On the origin of the moon’s feldspathic
highlands, pure anorthosite, and the feldspathic lunar meteorites. 41st
Lunar and Planetary Science Conference, abstract no. 1440.
Zeigler R. A. and Korotev R.
L. (2013) Petrography and geochemistry of feldspathic
lunar meteorite Larkman Nunatak 06638. 44th
Lunar and Planetary Science Conference, abstract no. 1767.
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