Sample Petrographic Description
Sample Number | EET 83227 |
Newsletter | 8,1 |
Location | Elephant Moraine |
Field Number | 2957 |
Dimensions (cm) | 13.0 x 10.0 x 9.0 |
Weight (g) | 1973.00 |
Original Classification | Eucrite (Polymict) |
Pairing | EET 79005; EET 83227; EET 83235; |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 23-54 | |
Weathering | |
B | |
Fracturing | |
B | |
Macroscopic Description - Roberta Score | |
EET83227 has a rounded shape and the exterior surfaces contain numerous deep vugs. A few millimeter-sized patches of fusion crust remain on the gray exterior. Several different clasts, the largest being 2 cm in longest dimension, are visible on the exterior. These include eucritic clasts, black fine-grained clasts, pinkish-brown crystalline clasts, and black and white clasts. Both interior and exterior surfaces contain numerous oxidation halos as large as 1-cm in diameter. Interior surfaces are lighter gray in color than the exterior. This stone is similar to other 1983 Elephant Moraine eucrites. | |
Thin Section Description (,4) - Jeremy Delaney | |
The section is a typical polymict eucrite with one large medium-grained mafic clast containing ophitic to radial pyroxene/plagioclase intergrowths. Pyroxene and feldspar in this clast both show zoning and have little clouding. Other clasts include breccia, shocked pyroxene and twinned feldspar. No maskelynite was seen. Coarse-grained lithic fragments, fine-grained granular mafic clasts and rare glassy fragments are also present. Three orthopyroxene grains more magnesian than En70 were located by microprobe, but diogenite-like clasts are very rare. |
Antarctic Meteorite Images for Sample EET 83227 | ||||
Lab Photo(s) : | ||||
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Antarctic Meteorite Images for Sample EET 83227 | ||||
Thin Section Photo(s) : | ||||
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References for Sample EET83227 | |
Torre-Fdez, I., Aramendia, J., Gomez-Nubla, L., Castro, K., Maguregui, M., de Vallejuelo, S. F. O., ... & Madariaga, J. M., 2018, Non-destructive characterisation of the Elephant Moraine 83227 meteorite using confocal Raman, micro-energy-dispersive X-ray fluorescence and Raman-scanning electron microscope-energy-dispersive X-ray microscopies. Analytical and bioanalytical chemistry, 410(28), 7477-7488. | |
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. | |
Magna, T., Simcikova, M., Moynier, F., 2014, Lithium systematics in howardite-eucrite-diogenite meteorites: Implications for crust-mantle evolution of planetary embryos. Geochimica et Cosmochimica Acta, 125, 131-145. | |
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. | |
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. | |
Herpers, U., Vogt, S., Bremer, K., Hofmann, H. J., Suter, M., Wieler, R., Lange, H. J., Michel, R., 1995, Cosmogenic nuclides in differentiated antarctic meteorites: measurements and model calculations. Planetary and Space Science, 43 Issues 3-4, March-April 1995, 545-556, ISSN 0032-0633, http://dx.doi.org/10.1016/0032-0633(94)00191-S. | |
Sugiura, N., Hashizume, K., Miura, Y., Kiyota, K., Zashu, S., 1995, Cosmogenic nitrogen isotopic disequilibrium observed in meteorites. Meteoritics, 30, 646-653. | |
Marvin, U. B., MacPherson, G. J., 1989, Field and Laboratory Investigations of Meteorites from Victoria Land and the Thiel Mountains Region, Antarctica 1982-1983 and 1983-1984. Smithsonian Contributions to the Earth Sciences Number, 28, 146. | |
Heumann, K. G., Gall, M., Weiss H., 1987, Geochemical investigations to explain iodine-overabundances in Antarctic meteorites. Geochimica et Cosmochimica Acta, 51 Issue 9, Sep-87, 2541-2547, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(87)90304-8. |