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Lunar Meteorite

Mount DeWitt 12007

Antarctica

 

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DEW 12007 in the field.

(photo credit: Korea Polar Research Institute)

 

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DEW 12007

(photo credit: Museo Nazionale dell'Antartide, Universitŕ degli Studi di Siena)

 

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Lab samples of DEW 12007. Click on image for enlargement. Thanks to Programma Nazionale di Ricerche in Antartide (PNRA), Italy, and Korean Expedition for Antarctic Meteorites (KOREAMET) for the sample.

(photo credit: Randy Korotev)

 

from The Meteoritical Bulletin, No. 103

Mount DeWitt (DEW) 12007

Antarctica [Collected jointly by Programma Nazionale di Ricerche in Antartide (PNRA), Italy, and Korean Expedition for Antarctic Meteorites (KOREAMET)]
Find: 2013 Jan 3
Mass: 94.2 g

Lunar Meteorite

History: A single unweathered stone was found on a blue ice patch during the XXVIII PNRA expedition, 2012-2013 (in collaboration with KOREAMET). Nine additional distinct meteorites were found in the same icefield.

Physical characteristics: Fresh, oblate (7 × 3 × 3 cm) stone of 94.2 g. 7% of the external surface is covered by a dark brown vesicular fusion crust. The remaining surface shows abundant mm-sized white and pale gray clasts embedded in a dark gray fine-grained matrix.

Petrography: (A. Collareta and L. Folco, DST-PI) Breccia consisting of numerous crystal fragments (pyroxene, plagioclase, olivine, silica polymorphs), plagioclase-rich clasts, gabbroic clasts, impact melt particles, rare basaltic and mingled breccia clasts. Clasts are embedded in a very fine crystal-rich matrix, which contains vesicular glassy veins and agglutinates. Main minerals are plagioclase, pyroxene (pigeonite and augite), olivine, Ti-bearing chromite, Cr-bearing ulvöspinel, ilmenite, troilite, minor silica polymorphs, baddeleyite, tranquillityite, and tiny FeNi-metal grains.

Geochemistry: (M. Gemelli, M. D’Orazio, A. Collareta, DST-PI) Pigeonite Fs42.3±10.7Wo13.5±3.5, Fe/Mn=63±11, n=19; augite Fs41.1±12.3Wo28.8±4.6, Fe/Mn=66±9, n=14, plagioclase An92.1±3.6Ab7.6±3.5Or0.3±0.1, n=13, fayalitic olivine Fa90.6±2.0, Fe/Mn=90±2, n=4, forsteritic olivine Fa41.5±6.0, Fe/Mn=94±2, n=3. All analyses by EPMA. Bulk Fe/Mn = 65 by HHXRF. Oxygen isotopes done by laser fluorination (A. Pack, UGött): d18O = 6.05, d17O = 3.13, Δ17O = -0.071 (all permil).

Classification: Lunar (mingled regolithic breccia)

Specimens: 47.5 g endcut (type specimen) at MNA-SI, 46.7 g endcut at KOPRI.

 

Randy Says…

Mount DeWitt (DEW) 12007 is almost certainly launch paired with to QUE 94281 and Yamato 793274/981031 from Antarctica as well as NWA 4884 and NWA 7611/8277 from the Sahara. See discussion at NWA 7611/8277.

 

More Information

Meteoritical Bulletin Database

DEW 12007

References

Collareta A., D’Orazio M., Gemelli M., Pack A., Folco L. (2014) The new lunar meteorite DEW 12007 (abstract). 77th Annual Meeting of the Meteoritical Society, abstract no. 5104.

Collareta A., D’Orazio M., Gemelli M., Pack A., Folco L. (2014)  High crustal diversity preserved in the lunar meteorite Mount DeWitt 12007 (Victoria Land, Antarctica). Meteoritics & Planetary Science 51, 351-371.

Korotev R. L. and Irving A. J. (2016) Not quite keeping up with the lunar meteorites – 2016. 47th Lunar and Planetary Science Conference, abstract no. 1358.

Nishiizumi K., Caffee M. W., and  Jull A. J. T. (2016) Exposure history of Mount DeWitt 12007 and proposed launch-paired Northwest Africa 4884, 7611, and 8277 lunar meteorites (abstract). 79th Annual Meeting of the Meteoritical Society, abstract no. 6514.

 

 

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Prepared by
: Randy L. Korotev
 
Department of Earth and Planetary Sciences
Washington University in St. Louis

Please don't contact me about the meteorite you think you've found until you read this and this.


e-mail
korotev@wustl.edu

Last revised: 17-November-2016