Official Meteoritical Bulletin entry for Northwest Africa 7007:
Northwest Africa 7007 Western Sahara Purchased: 2011 October Classification: Lunar meteorite (gabbro)
History: Found near Smara, southern Morocco in September 2011, and purchased from a dealer in Zagora, Morocco by Greg Hupé in October 2011. Physical characteristics: A single dense, rounded stone (91 g) partially coated with black fusion crust. Dark angular mineral clasts plus sparse white clasts are visible within a finer grained dark matrix. One small polymineralic gabbroic clast is exposed on the surface, and others are revealed in interior slices.
Petrography: (A. Irving and S. Kuehner, UWS) Crystal-rich regolithic breccia consisting of some larger polymineralic clasts (gabbro and ophitic basalt) and apparently related crystal debris in a sparse glassy, microvesicular matrix. Major components are anorthite, complexly-zoned subcalcic augite, ferropigeonite, and relatively large fragments composed of intergrowths of fayalite+hedenbergite+silica (typical of subsolidus inversion assemblages from primary pyroxferroite). Accessory phases include olivine, ilmenite, fayalite, hedenbergite, silica polymorph, troilite, Ni-free metal and baddeleyite (to 10 μm across within fayalitic rims on pyroxene). Matrix glass contains abundant small, round vesicles (typical of those representing trapped solar wind gases in other lunar regolith breccias). Geochemistry: Zoned subcalcic augite [(core Fs22.5Wo31.2, Fe/Mn=46), mantles (Fs34.2-50.0Wo29.6-25.9, Fe/Mn=55-65), ferropigeonite rims (Fs66.1Wo19.7, Fe/Mn=66)], olivine (Fa42.0-44.4, Fe/Mn=86-93), fayalite (Fa98.4, Fe/Mn=78-84), plagioclase (An91.4.5-93.2Or0.5-0.3). Classification: Achondrite (lunar, gabbro breccia). Terrestrial weathering is minimal. Specimens: A total of 18.2 g of sample and one polished thick section are on deposit at UWS. The main mass is held by an anonymous collector.
Scientific abstracts and news regarding NWA 7007:
Korotev R. L., Irving A. J., and Bunch T. E.
(2012) Keeping Up With the Lunar Meteorites — 2012 (abstract).
In Lunar and Planetary Science XLIII, abstract no. 1152,
43rd Lunar and Planetary Science Conference, Houston. http://www.lpi.usra.edu/meetings/lpsc2012/pdf/1152.pdf
Kuehner S. M., Irving A. J., and Korotev R. L.
(2012) Petrology and composition of lunar mare ferroan gabbro breccia Northwest Africa 7007:
New insights into the complex petrogenesis of Northwest Africa 773 and siblings (abstract).
In Lunar and Planetary Science XLIII, abstract no. 1519,
43rd Lunar and Planetary Science Conference, Houston. http://www.lpi.usra.edu/meetings/lpsc2012/pdf/1519.pdf
Fagan T. J. * Wakabayashi Y. Suginohara A. Kashima D.
(2012) Do high Ti abundances in lunar basalts lead to silica-enrichment? Yes and no (abstract). 75th Annual Meeting of the Meteoritical Society, abstract no. 5110. http://www.lpi.usra.edu/meetings/metsoc2012/pdf/5110.pdf
Wang Y., Guan Y., Hsu W., and Eiler J. M.
(2012) Water content, chlorine and hydrogen isotope compositions of lunar apatite (abstract). 75th Annual Meeting of the Meteoritical Society, abstract no. 5170. http://www.lpi.usra.edu/meetings/metsoc2012/pdf/5170.pdf
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 (abstract).
In Lunar and Planetary Science XLII, abstract no. 1986,
Lunar and Planetary Institute, Houston. http://www.lpi.usra.edu/meetings/lpsc2011/pdf/1986.pdf
Macke R. J., Britt D. T., and Consolmagno G. J.
(2011) Density, porosity and magnetic susceptibility of achondritic meteorites. Meteoritics & Planetary Science46, 311-326.
Wakabayashi Y., Fagan T. J., Hayakawa S., Sasamoto A.
(2011) Evolution of trapped vs. main liquids during crystallization of Northwest Africa 773 olivine cumulate (abstract). Thirty-Fourth Symposium on Antarctic Meteorites, p. 85-86.
National Institute of Polar Research, Tokyo.
McCubbin F. M., Steele A., Hauri E. H., Nekvasil H., Yamashita S., and Hemley R. J.
(2010) Nominally hydrous magmatism on the Moon. Proceedings of the National Academy of Sciences, doi: 10.1073/pnas.1006677107. http://www.pnas.org/content/early/2010/06/07/1006677107.full.pdf
Nagaoka H. Karouji Y., Takeda H, Ebihara M., and Hasebe N.
(2010) Chemical signatures in bulk element composition for Northwest Africa 2977 (abstract).
73th Annual Meeting of the Meteoritical Society, abstract no. 5182.
Lunar and Planetary Institute, Houston. http://www.lpi.usra.edu/meetings/metsoc2010/pdf/5183.pdf
Zhang A. C., Taylor L. A., Hsu W. B., Floss C., Li X. H., and Liu Y.
(2010) Petrogenesis of lunar meteorite Northwestern Africa 2977:
Rare earth element geochemistry and baddeleyite Pb/Pb dating (abstract).
In Lunar and Planetary Science XLI, abstract no. 1052,
41st Lunar and Planetary Science Conference, Houston. http://www.lpi.usra.edu/meetings/lpsc2010/pdf/1052.pdf
Zhang A.-C., Hsu W.-B., Floss C., Li X.-H., Qiu-Li Li, Liu Y. and Taylor L. A.
(2010) Petrogenesis of lunar meteorite Northwest Africa 2977: Constraints from in situ microprobe results. Meteoritics and Planetary Science45, 1929-1947.
Fagan T. J., Suginohara A., and Kashima D.
(2010) Effect of initial Ti-abundance on Si-enrichment during magmatic evolution of lunar basalts:
Initial modeling results (abstract).
The 33rd Symposium on Antarctic Meteorites, Tokyo. http://yamato.nipr.ac.jp/AMRC/symposium/2010/abstracts/Fagan.pdf
Gibson K. E., Jolliff B. L., Zeigler R. A., and Korotev R. L.
(2010) Testing petrogenetic relationships of the lunar nwa773 meteorite clan with nickel & cobalt in olivine? (abstract).
In Lunar and Planetary Science XLI, abstract no. 2593,
41st Lunar and Planetary Science Conference, Houston. http://www.lpi.usra.edu/meetings/lpsc2010/pdf/2593.pdf
Macke R. J., Kiefer W. S., Britt D. T., and Consolmagno G. J.
(2010) Density, porosity and magnetic susceptibility of lunar rocks (abstract).
In Lunar and Planetary Science XLI, abstract no. 1252,
Lunar and Planetary Institute, Houston. http://www.lpi.usra.edu/meetings/lpsc2010/pdf/1252.pdf
Borg L. E., Gaffney A. M., Shearer C. K., DePaolo D. J., Hutcheon I. D., Owens T. L., Ramon E., and Brennecka G.
(2009) Mechanisms for incompatible-element enrichment on the Moon deduced from the lunar basaltic meteorite Northwest Africa 032. Geochimica et Cosmochimica Acta73, 3963–3980. http://adsabs.harvard.edu/abs/2009GeCoA..73.3963B
Nyquist L. E., Shih C.-Y., Reese Y. D., and Irving A. J.
(2009) Sm-Nd and Rb-Sr ages for Northwest Africa 2977, a young lunar gabbro from the PKT (abstract).
72th Annual Meeting of the Meteoritical Society, number 5347. http://www.lpi.usra.edu/meetings/metsoc2009/pdf/5347.pdf
Zhang A. and Hsu W.
(2008) Mineralogical and Raman spectroscopic studies of Northwestern Africa 2977 lunar meteorite (abstract).
71st Annual Meeting of the Meteoritical Society, abstract no. 5122,
Lunar and Planetary Institute, Houston. http://www.lpi.usra.edu/meetings/metsoc2008/pdf/5122.pdf
Fagan T. J., Hayakawa S., Kodama S., Kataoka Y., and Sasamoto A.
(2008) Late-stage crystallization products in NWA 773 group lunar meteorites (abstract).
In Lunar and Planetary Science XXXIX, abstract no. 1854,
39th Lunar and Planetary Science Conference, Houston. http://www.lpi.usra.edu/meetings/lpsc2008/pdf/1854.pdf
Gaffney A. and Borg L.
(2008) What we are learning about the Moon from lunar meteorites.
Goldschmidt Conference Abstracts 2008, Geochimica et Cosmochimica Acta72, 12S, p. A287. http://goldschmidt.info/2008/abstracts/finalPDFs/A287.pdf
Fernandes V.A., Burgess R., Bischoff A., Sokol A. K., and Haloda J.
(2007) Kalahari 009 and North East Africa 003: Young (<2.5 ga) lunar mare basalts (abstract).
In Lunar and Planetary Science XXXVIII, abstract no. 1611,
38th Lunar and Planetary Science Conference, Houston. http://www.lpi.usra.edu/meetings/lpsc2007/pdf/1611.pdf
Hallis L. H. Joy K. H. Anand M., and Russell S. S.
(2007) Compositional analysis of the very-low-Ti mare basalt component of NWA 773 and
comparison with low-Ti basalts, LAP 03632 & 02436 (abstract).
In Lunar and Planetary Science XXXVIII, abstract no. 1703,
38th Lunar and Planetary Science Conference, Houston. http://www.lpi.usra.edu/meetings/lpsc2007/pdf/1703.pdf
Fagan T.
(2007) Formation of symplectite inclusions by direct quenching of a high-FeO/(FeO+MgO) silicate liquid on the Moon (abstract). Antarctic Meteorites XXXI, p. 15-16,
National Institute of Polar Research, Tokyo.
Zeigler R. A., Korotev R. L., and Jolliff B. L.
(2007) Petrography, geochemistry, and pairing relationships of basaltic
lunar meteorite stones NWA 773, NWA 2700, NWA 2727, NWA 2977, and NWA 3160 (abstract).
In Lunar and Planetary Science XXXVIII, abstract no. 2109,
38th Lunar and Planetary Science Conference, Houston. http://www.lpi.usra.edu/meetings/lpsc2007/pdf/2109.pdf
Burgess R., Fernandes V. A., Irving A. J., and Bunch T. E.
(2007) Ar-Ar ages of NWA 2977 and NWA 3160 – lunar meteorites paired with NWA 773 (abstract).
In Lunar and Planetary Science XXXVIII, abstract no. 1603,
38th Lunar and Planetary Science Conference, Houston. http://www.lpi.usra.edu/meetings/lpsc2007/pdf/1603.pdf
Fagan T. J.
(2007) Formation of symplectite-like inclusions by direct quenching from igneous
liquid in lunar meteorite NWA 773 (abstract).
70th Annual Meeting of the Meteoritical Society, abstract no. 5204.
Lunar and Planetary Institute, Houston. http://www.lpi.usra.edu/meetings/metsoc2007/pdf/5204.pdf
Jolliff B. L., Zeigler R. A., and Korotev R. L.
(2007) Compositional characteristics and petrogenetic relationships among
the NWA 773 clan of lunar meteorites (abstract).
In Lunar and Planetary Science XXXVIII, abstract no. 1489,
38th Lunar and Planetary Science Conference, Houston. http://www.lpi.usra.edu/meetings/lpsc2007/pdf/1489.pdf
Korotev R. L. and Zeigler R. A.
(2007) Keeping up with the lunar meteorites (abstract).
In Lunar and Planetary Science XXXVIII, abstract no. 1340,
Lunar and Planetary Institute, Houston. http://www.lpi.usra.edu/meetings/lpsc2007/pdf/1340.pdf
Fagan T. J.
(2006) A record of extreme FeO/(MgO+FeO) enrichment during igneous
crystallization on the Moon preserved in lunar meteorite Northwest Africa 773 (abstract).
In Antarctic Meteorites XXX, 9-10, National Institute of Polar Research, Tokyo.
Bunch T. E., Wittke J. H., Korotev R. L., and Irving A. J.
(2006) Lunar meteorites NWA 2700, NWA 2727 and NWA 2977:
Mare basalt/gabbro breccias with affinities to NWA 773 (abstract).
In Lunar and Planetary Science XXVII, abstract no. 1375,
Lunar and Planetary Institute, Houston. http://www.lpi.usra.edu/meetings/lpsc2006/pdf/1375.pdf
Zeigler R. A., Korotev R. L., Irving A. J., Jolliff B. L., Kuehner S. M., and Hupé A. C.
(2006) Petrography and composition of lunar basaltic meteorite NWA 3160 (abstract).
In Lunar and Planetary Science XXXVII, number 1804,
Lunar and Planetary Institute, Houston. http://www.lpi.usra.edu/meetings/lpsc2006/pdf/1804.pdf
Zeigler R. A., Korotev R. L., Jolliff B. L., Bunch T. E., and Irving A. J.
(2006) Pairing relationships among Northwest African basaltic lunar meteorites
based on compositional and petrographic characteristics (abstract).
In Antarctic Meteorites XXX, 125-126,
National Institute of Polar Research, Tokyo. http://meteorites.wustl.edu/abstracts/ms2006/a_m06z01.pdf
Zeigler R. A., Korotev R. L., Jolliff B. L., Bunch T. E., and Irving A. J.
(2006) Pairing and petrogenetic relationships among basaltic
lunar meteorites from northwest Africa (abstract). Meteoritics & Planetary Science41, A197.
69th Annual Meeting of the Meteoritical Society, abstract no. 5235.
Lunar and Planetary Institute, Houston. http://www.lpi.usra.edu/meetings/metsoc2006/pdf/5235.pdf
Nishiizumi K. and Caffee M. W.
(2006) Constraining the number of lunar and martian meteorite falls (abstract).
In Meteorit. Planet. Sci.41, p. A133,
69th Annual Meeting, Meteoritical Society. http://www.lpi.usra.edu/meetings/metsoc2006/pdf/5368.pdf
Borg L. E., Shearer C. K., Asmerom Y., and Papike J. J.
(2005) Geochemical and isotopic systematics of the youngest
dated lunar igneous rock, Northwest Africa 773 (abstract).
In Lunar and Planetary Science XXXVI, abstract no. 1026,
Lunar and Planetary Institute, Houston. http://www.lpi.usra.edu/meetings/lpsc2005/pdf/1026.pdf
Shearer C. K., Borg L. E., and Papike J. J.
(2005) A view of KREEP-rich lunar basaltic magmatism through the eyes of NWA 773 (abstract).
In Lunar and Planetary Science XXXVI, abstract no. 1191,
Lunar and Planetary Institute, Houston. http://www.lpi.usra.edu/meetings/lpsc2005/pdf/1191.pdf
Borg L. E., Shearer C. K., Asmerom Y., and Papike J. J.
(2004) Prolonged KREEP magmatism on the Moon indicated by the youngest dated lunar igneous rock. Nature432, 209–211. http://adsabs.harvard.edu/abs/2004Natur.432..209B
Nishiizumi K., Hillegonds D. J., McHargue L. R., and Jull A. J. T.
(2004) Exposure and terrestrial histories of new lunar and martian meteorites (abstract),
In Lunar and Planetary Science XXXV, abstract no. 1130,
Lunar and Planetary Institute, Houston. http://www.lpi.usra.edu/meetings/lpsc2004/pdf/1130.pdf
Fagan T. J., Taylor J. G., Keil K., Hicks T. L., Killgore M., Bunch T. E., Wittke J. H., Mittlefehldt D. W., Clayton R. N., Mayeda T. K., Eugster O., Lorenzetti S., and Norman M. D.
(2003) Northwest Africa 773: Lunar origin and iron-enrichment trend. Meteoritics & Planetary Science38, 529–554. http://adsabs.harvard.edu/abs/2003m%26ps...38..529f
Jolliff B. L., Korotev R. L., Zeigler R. A., Floss C., and Haskin L. A.
(2003) Northwest Africa 773: Lunar mare breccia with a shallow-formed
olivine-cumulate component, very-low-ti heritage, and a KREEP connection (abstract), Lunar and Planetary Science34, abstract #1935,
Lunar and Planetary Institute, Houston. http://www.lpi.usra.edu/meetings/lpsc2003/pdf/1935.pdf
Jolliff B. L., Korotev R. L., Zeigler R. A., Floss C., and Haskin L. A.
(2003) Northwest Africa 773: Lunar mare breccia with a shallow-formed
olivine-cumulate component, very-low-Ti (VLT) heritage, and a KREEP connection. Geochimica et Cosmochimica Acta67, 4857–4879. http://epsc.wustl.edu/%7Erlk/papers/jolliff_et_al_2003_gca_nwa_773.pdf
Korotev R. L., Zeigler R. A., Jolliff B. L., and Haskin L. A.
(2002) Northwest Africa 773 - An unusual rock from the lunar maria,
65th Meteoritical Society Meeting, no. 5259. http://www.lpi.usra.edu/meetings/metsoc2002/pdf/5259.pdf
Fernandes V. A., Burgess R. and Turner G.
(2002) North West Africa 773 (NWA773): Ar-Ar studies of breccia and cumulate lithologies (abstract).
In The Moon Beyond 2002: Next Steps in Lunar Science and Exploration, p. 16, abstract no. 3033, LPI Contribution No. 1128,
Lunar and Planetary Institute, Houston. http://www.lpi.usra.edu/meetings/moon2002/pdf/3033.pdf
Bridges J. C., Jeffries T. E., and Grady M. M.
(2002) Trace element signatures of trapped KREEP in olivine- rich clasts within lunar meteorite NWA773,
65th Meteoritical Society Meeting, no. 5137. http://www.lpi.usra.edu/meetings/metsoc2002/pdf/5137.pdf
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(2001) New lunar meteorite Northwest Africa 773: Dual origin by cumulate crystallization and impact brecciation (abstract),
64th Meteoritical Society Meeting, no. 5149. http://www.lpi.usra.edu/meetings/metsoc2001/pdf/5149.pdf
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Complete mass of NWA 7007 - View 2.
Polished slice of NWA 7007.
Closeup image of NWA 7007 matrix.
Dr. Dan Britt of UCF holding NWA 7007 to put in pycnometer for bulk density analysis.
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