Antarctic Meteorite Petrographic Description

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Sample Petrographic Description

Sample Number

EET 96293

Newsletter

21,2

Location

Elephant Moraine

Field Number

10601

Dimensions (cm)

4.5 x 4.5 x 3.0

Weight (g)

100.56

Original Classification

Ureilite

Pairing

EET 96293; EET 96314; EET 96331

Mineral Composition (%Fa & %Fs)

Fayalite (mol%): 6-13;Ferrosilite (mol%): 11

Weathering

Fracturing

Macroscopic Description - Kathleen McBride

This achondrite has a dull black fusion crusted exterior with a few shiny glassy patches. Moderate weathering is visible on exterior surface. The interior is steel gray in color with a crystalline texture. Some crystals are dark in color.

Thin Section Description (,2) - Tim McCoy

The section consists of an aggregate of large olivine grains up to 1 mm across with numerous areas of finer-grained (~200 mm), equigranular olivine, pigeonite and augite with abundant 120° triple junctions. Individual grains are rimmed by carbon-rich material containing traces of metal. Shock effects are numerous, including undulatory extinction, polysynthetic twinning and kink banding. Olivines have cores of Fa_12-13, with rims reduced to Fa₆. Pigeonites(Fs₁₁,Wo₅) and augites (Fs₇, Wo₃₇) are relatively homogeneous. The meteorite is a ureilite.

Antarctic Meteorite Images for Sample EET 96293

Lab Photo(s) :

Antarctic Meteorite Images for Sample EET 96293

Thin Section Photo(s) :

Thin Section Photograph of Sample EET 96293 in Cross-Polarized Light

Thin Section Photograph of Sample EET 96293 in Plane-Polarized Light

References for Sample EET96293

Goodrich, C. A., Ash, R. D., Van Orman, J. A., Domanik, K., McDonough, W. F., 2013, Metallic phases and siderophile elements in main group ureilites: Implications for ureilite petrogenesis. , Geochimica et Cosmochimica Acta, 112 , 1-Jul-13 , 340-373 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2012.06.022 .

Lee, D., Halliday, A. N., Singletary, S. J., Grove, T. L., 2009, 182Hf-182W chronometry and early differentiation of the ureilite parent body. , Earth and Planetary Science Letters, 288 Issues 3-4 , 15-Nov-09 , 611-618 , ISSN 0012-821X , http://dx.doi.org/10.1016/j.epsl.2009.10.025 .

Singletary, S. J., Grove, T. L., 2003, Early petrologic processes on the ureilite parent body. , Meteoritics & Planetary Science, 38 , 95-108 .

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