Antarctic Meteorite Petrographic Description

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Sample Petrographic Description

Sample Number

EET 92003

Newsletter

16,2

Location

Elephant Moraine

Field Number

8581

Dimensions (cm)

5.8 x 3.6 x 2.4

Weight (g)

66.35

Original Classification

Eucrite

Updated Classification

Eucrite (Brecciated)

Mineral Composition (%Fa & %Fs)

Ferrosilite (mol%): 46-52

Weathering

A/Be

Fracturing

Macroscopic Description - Cecilia Satterwhite

Two exterior surfaces of this achondrite are covered by shiny, black fusion crust. Areas devoid of fusion crust are cream-colored and have a rough texture. Evaporate deposit is present. The interior matrix is light to medium gray. Inclusions, as large as 1 cm, are present.

Thin Section Description (,7) - Brian Mason

The section shows a fine-grained (average grain size 0.1 mm) aggregate of pyroxene and plagioclase with a brecciated structure, and a few coarser-grained clasts. The pyroxene is fairly uniform in composition, clustering around Wo₁₃Fs₄₉; plagioclase composition is An_86-91. Tridymite is present in small amounts. The meteorite is a monomict eucrite.

Reclassification Notes (AMN 17,1)

Re-classified to brecciated eucrite in Meteoritical Bulletin 76 and also AMN vol. 17 no. 1.

Antarctic Meteorite Images for Sample EET 92003

Lab Photo(s) :

South View of Sample Splits for Sample EET 92003

West View of Sample Splits for Sample EET 92003

References for Sample EET92003

Schiller, M., Dallas, J.A., Creech, J., Bizzarro, M., Baker, J.A., 2017, Tracking the formation of magma oceans in the Solar System using stable magnesium isotopes. Geochem. Persp. Let., 3, 22-31.

Shirai, N., Okamoto, C., Yamaguchi, A., Ebihara, M., 2016, Siderophile elements in brecciated HED meteorites and the nature of projectile materials in HED meteorites. Earth and Planetary Science Letters, 437, 57-65.

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.

Le Corre, L., Reddy, V., Sanchez, J. A., Dunn, T., Cloutis, E. A, Izawa, M. R. M, Mann, P., Nathues, A., 2015, Exploring exogenic sources for the olivine on Asteroid (4) Vesta. Icarus, 258, 483-499.

Le Corre, L., Reddy, V., Nathues, A., Cloutis, E. A., 2011, How to characterize terrains on 4 Vesta using Dawn Framing Camera color bands?. Icarus, 216 Issue 2, Dec-11, 376-386, ISSN 0019-1035, http://dx.doi.org/10.1016/j.icarus.2011.09.014.

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.

Mittlefehldt, D. W., Lindstrom, M. M., 2003, Geochemistry of eucrites: genesis of basaltic eucrites, and Hf and Ta as petrogenetic indicators for altered antarctic eucrites. Geochimica et Cosmochimica Acta, 67 Issue 10, 15-May-03, 1911-1934, ISSN 0016-7037, http://dx.doi.org/10.1016/S0016-7037(02)01411-4.

Benoit, P. H., Sears, D. W. G., Akridge, J. M. C., Bland, P. A., Berry, F. J., Pillinger, C. T., 2000, The non-trivial problem of meteorite pairing. Meteoritics & Planetary Science, 35, 393-417.

RELAB, , Reflectance Experiment Lab , catalogue of samples.

Antarctic Meteorite Petrographic Description

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