Northwest Africa 5000
Africa 5000. Lower right image: 19 cm across. Click on image for
credit: by Greg Hupé)
big slice of NWA 5000. Click on image for enlargement (big).
credit: Randy Korotev)
of lab samples. Notice the large, rusted metal grain. Millimeter ticks for
scale. Click on image for enlargement.
credit: Randy Korotev)
of a thin section of NWA 5000, plane polarized light (left) and
cross-polarized light (right). Scale bar is 1 mm. Click on image for
credit: Axel Wittmann)
Meteoritical Bulletin, No. 93, Meteoritics
& Planetary Science 43,
Find: 2007 July
Mass: 11,528 g
(lunar, feldspathic breccia)
Found in July 2007 in southern Morocco and provided to Adam Hupé in October
2007 by a Moroccan dealer.
characteristics: A single, large cuboidal stone (11.528
kg) with approximate dimensions 27 cm × 24 cm × 20 cm. One side (which
appears to have been embedded downward in light brown mud) has preserved
regmaglypts and is partially covered by translucent, pale greenish fusion
crust with fine contraction cracks. Abundant large beige to white,
coarse-grained clasts up to 8 cm across (some of which have been eroded out
on exterior surfaces of the stone, likely by eolian sand blasting) and
sparse black, vitreous clasts up to 2 cm across (containing irregular small
white inclusions) are set in a dark gray to black, partially glassy breccia
matrix. One partially eroded clast exposed on an exterior surface contains
both the coarse grained beige lithology and the more resistant black,
vitreous lithology in sharp contact.
Irving and S. Kuehner, UWS)
Almost monomict fragmental breccia dominated by Mg-suite olivine gabbro
clasts consisting predominantly of coarse-grained (0.5-2 mm) calcic
plagioclase, pigeonite (some with fine exsolution lamellae), and olivine
with accessory merrillite, Mg-bearing ilmenite, Ti-bearing chromite,
baddeleyite, rare zirconolite, silica polymorph, K-feldspar, kamacite, and
troilite. Some gabbro clasts have shock injection veins composed mostly of
glass containing myriad fine troilite blebs and engulfed mineral fragments.
Black, vitreous impact melt clasts consist of sporadic, small angular
fragments (apparently surviving relics) of gabbro and related mineral
phases in a very fine grained, non-vesicular, ophitic-textured matrix of
pigeonite laths (up to 20 microns long × 2 microns wide) and interstitial
plagioclase with tiny spherical grains of kamacite, irregular grains of
schreibersite and rare troilite.
composition and geochemistry: Gabbro clasts: plagioclase
(An96.1-98.0Or<0.1), pigeonite (Fs32.0-64.5Wo6.7-13.1;
FeO/MnO = 51.1-62.0), olivine in different clasts range from Fa23.9-24.2,
Fa40.4 to Fa58.8 (with FeO/MnO = 81-100), chromite
[(Cr/(Cr + Al) = 0.737, Mg/(Mg + Fe) = 0.231, TiO2 = 5.9 wt%],
ilmenite (4.1 wt% MgO). Bulk composition: (R. Korotev, WUSL) INAA
of 6 subsamples gave mean values of 5.3 wt% FeO and 0.4 ppm Th.
Classification: Achondrite (lunar, feldspathic breccia). Specimens: A
total of 40.2 g of sample, two polished mounts and one large polished thin
section are on deposit at UWS. A.
Hupé hold the main mass.
11.5 kg, it is one of the biggest lunar meteorites. It is mineralogically
and texturally unique among feldspathic lunar meteorites. It contains large
fragments of metal, apparently from an iron meteorite.
Arai T., Yamamoto A., Ohtake M., Matsunaga T., Haruyama
J., Hiroi T., Sasaki S., and Matsui T. (2011)
Lunar crustal mineralogy inferred from lunar meteorites and Kaguya data. The 34rd Symposium on Antarctic Meteorites, 3-4.
Arai T., Hiroi
T., Sasaki S., and Matsui T. (2013) Origin of the lunar crust inferred from mineralogy and
reflectance spectra of lunar meteorites. 44th
Lunar and Planetary Science Conference, abstract no. 1016.
Artemieva N. (2014) NWA 5000 — One of a kind? 77th Annual Meeting of the
Meteoritical Society, abstract no. 5231.
Fernandes V. A. (2009) 40Ar-39Ar age for gabbroic lunar meteorite
Northwest Africa 5000. Geochimica
et Cosmochimica Acta Supplement 73, A365.
Fritz J. (2012) Impact
ejection of lunar meteorites and the age of Giordano Bruno. Icarus 221, 1183-1186.
M. L. Norman M. D., and Assis Fernandes V. (2016) Clues to the origin of gabbroic lunar meteorite Northwest
Africa 5000. 47th Lunar and Planetary Science Conference, abstract no.
Grange M. L., Norman M. D.
and Bennett V. (2016) A Possible
4.1–4.2 Ga impact event recorded in lunar meteorite Northwest Africa 5000.
79th Annual Meeting of the Meteoritical Society, abstract no. 6300.
Hidaka H. and Yoneda S. (2013) Isotopic studies of radiogenic and neutron-captured REE of
lunar meteorites. 76th Annual Meeting of the Meteoritical Society,
abstract no. 5042.
Humayun M. and Irving A.
(2008) Impactor metal in gabbroic lunar meteorite Northwest Africa
5000. Goldschmidt Conference Abstracts 2008, Geochimica et Cosmochimica Acta 72, 12S, A402.
Irving A. J., Kuehner S. M.,
Korotev R. L., Rumble D. III, and Hupé A. C.
(2008) Petrology and bulk composition of large lunar feldspathic leucogabbroic breccia Northwest Africa 5000. Lunar and Planetary Science XXXIX, abstract no. 2186.
Korotev R. L. (2013) Siderophile elements in brecciated lunar
Lunar and Planetary Science Conference, abstract no. 1028.
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.
Macke R. J., Kiefer W. S.,
Britt D. T., Irving A. J., and Consolmagno G. J.
(2011) Densities, porosities and magnetic susceptibilities of
meteoritic lunar samples: Early results. 42nd
Lunar and Planetary Science Conference, abstract no. 1986.
Macke R. J., Britt D. T., and
Consolmagno G. J. (2011) Density, porosity and magnetic susceptibility
of achondritic meteorites. Meteoritics & Planetary Science 46, 311-326.
Masahiro M., Tomioka N., Ohtani E., Seto Y., Nagaoka
H, Götze J, Miyake A., Ozawa S., Sekine T.,
Miyahara M., Tomeoka K., Matsumoto M., Shoda N., Hirao N., and
Kobayashi T. (2018) Discovery of
moganite in a lunar meteorite as a trace of H2O ice in the Moon’s regolith. Science Advances, 4, eaar4378
Nagurney A. B., Treiman A. H., and Spudis P. D.
(2016) Petrology, bulk composition, and provenance of meteorite
Northwest Africa 5000. 46th Lunar and Planetary Science Conference, abstract
Nishiizumi K., Caffee M. W.,
Vogel N., Wieler R., Leclerc M. D., and Jull A.
J. T. (2009) Exposure history of lunar meteorite Northwest Africa 5000.
40th Lunar and Planetary Science Conference, abstract no. 1476.
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