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 | |
B | |
Fracturing | |
A | |
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 Fa12-13, 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) : | ||||
References for Sample EET96293 | |
Peterson, L.D., Newcombe, M.E., Alexander, C.M.O'D., Wang, J., Sarafian, A.R., Bischoff, A.and , Nielsen, S.G., 2023, The H2O content of the ureilite parent body, Geochemicia et Cosmochemica Acta, 340, 141-157, doi:10.1016/j.gca.2022.10.036. | |
Stellar, T., Burkhardt, C., Yang, C., and Kleine, T., 2022, Nucleosynthetic zinc isotope anomalies reveal a dual origin of terrestrial volatiles, Icarus, 386, doi: 10.1016/j.icarus.2022.115171. | |
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. |