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Mount DeWitt 12007
Basic information Name: Mount DeWitt 12007
     This is an OFFICIAL meteorite name.
Abbreviation: DEW 12007
Observed fall: No
Year found: 2013
Country: Antarctica [Collected jointly by Programma Nazionale di Ricerche in Antartide (PNRA), Italy, and Korean Expedition for Antarctic Meteorites (KOREAMET)]
Mass:help 94.2 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Lunar
Recommended:  Lunar    [explanation]

This is 1 of 83 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: Approved 10 Apr 2014
Writeuphelp
Writeup from MB 103:

Mount DeWitt 12007 (DEW 12007)        77°14.153’S, 158°2.218’E

Antarctica

Found: 2013 Jan 3

Classification: 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): δ18O = 6.05, δ17O = 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.

Data from:
  MB103
  Table 0
  Line 0:
Origin or pseudonym:Blue ice patch 40 km WSW of Mount DeWitt
Date:2013 Jan 3
Latitude:77°14.153'S
Longitude:158°2.218'E
Mass (g):94.2
Pieces:1
Class:Lunar
Magnetic suscept.:3.11±0.09
Classifier:A. Collareta, M. Gemelli, M. D'Orazio, L. Folco, DST-PI
Type spec mass (g):47.5
Type spec location:MNA-SI
Main mass:MNA-SI
Finder:Han Kyu Yoo, KOPRI
Comments:Submitted by M. D'Orazio
Plots: O isotopes:  
Institutions
   and collections
DST-PI: Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, 56126 Pisa, Italy (institutional address; updated 17 Oct 2011)
MNA-SI: Museo Nazionale dell'Antartide, Università di Siena, Via Laterina 8, I-53100 Siena, Italy; Website (institutional address; updated 13 Dec 2011)
KOPRI: Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon, Korea, 406-840, South Korea; Website (institutional address; updated 20 Dec 2014)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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Geography:

Antarctica
Coordinates:
     Recommended::   (77° 14' 9"S, 158° 2' 13"E)

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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