Antarctic Meteorite Petrographic Description

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Sample Petrographic Description

Sample Number

MET 00425

Newsletter

24,2

Location

Meteorite Hills

Field Number

13562

Dimensions (cm)

5.5 x 5.5 x 3.5

Weight (g)

118.30

Original Classification

Diogenite

Mineral Composition (%Fa & %Fs)

Ferrosilite (mol%): 15

Weathering

B/C

Fracturing

Macroscopic Description - Kathleen McBride

Brown-black fusion crust makes up less than 5 percent of the surface area of this meteorite. The exposed interior is yellow-green and has large vugs, or cavities where material has weathered away or has been plucked. The interior is a very fine-grained, cream-colored matrix loaded with pale green millimeter-sized euhedral crystals, small black specks (less than 1 mm), and millimeter-sized rusty clasts that have stained the surrounding matrix. This meteorite is soft and moderately friable.

Thin Section Description (,2) - Tim McCoy, Linda Welzenbach

The section shows a groundmass of coarse comminuted pyroxene that has polycrystalline fragments with grain sizes up to 2.5 mm. Orthopyroxene has a composition of Fs₁₅Wo₁. The Fe/Mn ratio of the pyroxene is ≈30. Stringers of SiO₂ were found in igneous contact with orthopyroxene. The meteorite is a diogenite.

Antarctic Meteorite Images for Sample MET 00425

Field Photo(s) :

ANSMET MET 00425 - Field Number: 13562, NASA Photo Number: jsc2018e094508

Field photo image(s) courtesy of the ANSMET (ANtarctic Search for METeorites) Program, Case Western Reserve University and the University of Utah

Antarctic Meteorite Images for Sample MET 00425

Lab Photo(s) :

Lab Photo of Sample MET 00425 Showing Bottom East View

Lab Photo of Sample MET 00425 Showing Top East View

Lab Photo of Sample MET 00425 Showing Top North View

Lab Photo of Sample MET 00425 Showing Top South View

Lab Photo of Sample MET 00425 Showing Top West View

References for Sample MET00425

Mittlefehldt, D. W., 2015, Asteroid (4) Vesta: I. The howardite-eucrite-diogenite (HED) clan of meteorites. , Chemie der Erde - Geochemistry, 75 Issue 2 , Jun-15 , 155-183 , ISSN 0009-2819 , http://dx.doi.org/10.1016/j.chemer.2014.08.002 .

Greenwood, R. C., Barrat, J. A., Yamaguchi, A., Franchi, I. A., Scott, E. R., Bottke, W. F., Gibson, J. M., 2014, The oxygen isotope composition of diogenites: Evidence for early global melting on a single, compositionally diverse, HED parent body. , Earth and Planetary Science Letters, 390 , 165-174 .

Mittlefehldt, D. W., Beck, A. W., Lee, C.-T. A., Mcsween, H. Y., Buchanan, P. C., 2012, Compositional constraints on the genesis of diogenites. , Meteoritics & Planetary Science, 47 , 72-98 , http://dx.doi.org/10.1111/j.1945-5100.2011.01314.x .

Schiller, M., Baker, J., Creech, J., Paton, C., Millet, M., Irving, A., Bizzarro, M., 2011, Rapid Timescales for Magma Ocean Crystallization on the Howardite-Eucrite-Diogenite Parent Body. , ApJ, 740 , L22 , http://dx.doi.org/10.1088/2041-8205/740/1/L22 .

Barrat, J. A., Yamaguchi, A., Zanda, B., Bollinger, C., Bohn, M., 2010, Relative chronology of crust formation on asteroid Vesta: Insights from the geochemistry of diogenites. , Geochimica et Cosmochimica Acta, 74 Issue 21 , 1-Nov-10 , 6218-6231 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2010.07.028 .

Barrat, J. A., Yamaguchi, A., Greenwood, R. C., Benoit, M., Cotten, J., Bohn, M., Franchi, I. A., 2008, Geochemistry of diogenites: Still more diversity in their parental melts. , Meteoritics & Planetary Science, 43 , 1759-1775 , http://dx.doi.org/10.1111/j.1945-5100.2008.tb00641.x .

Schultz, L., Franke, L., 2004, Helium, neon, and argon in meteorites: A data collection. , Meteoritics & Planetary Science, 39 , 1889-1890 , http://dx.doi.org/10.1111/j.1945-5100.2004.tb00083.x .

Antarctic Meteorite Petrographic Description

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