Sample Petrographic Description
Sample Number | QUE 93341 |
Newsletter | 18,1 |
Location | Queen Alexandra Range |
Field Number | 8427 |
Dimensions (cm) | 3.0 x 1.7 x 1.2 |
Weight (g) | 7.46 |
Original Classification | Ureilite |
Pairing | QUE 93336; QUE 93341; QUE 94613; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 23;Ferrosilite (mol%): 18 | |
Weathering | |
B | |
Fracturing | |
A | |
Macroscopic Description - Robbie Marlow | |
Both of these small specimens are identical. The small amount of fusion crust that remains is dull and dark brown. The rest of the exterior surfaces have a polished, waxy appearance. The brownish-gray interior shows abundant crystal faces. | |
Thin Section Description (,2) - Brian Mason | |
The sections are so similar that the meteorites are certainly paired. They show anhedral grains of olivine and pyroxene in a black matrix. Considerable weathering is indicated by brown limonite rimming many grains. In reflected light the margins of the silicate grains are seen to contain numerous minute metal grains, probably the product of reduction from their iron content by the carbonaceous matrix. During polishing the probable presence of microscopic diamonds in the matrix was noted. Microprobe analyses show that most of the olivine and pyroxene has uniform composition; olivine, Fa23; pyroxene Wo10Fs18; but the margins of the grains show greatly reduced iron contents. The meteorite is a ureilite, and appears to be relatively unshocked. |
Antarctic Meteorite Images for Sample QUE 93341 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample QUE 93341 | ||||
Thin Section Photo(s) : | ||||
References for Sample QUE93341 | |
Rochette, P., Gattacceca, J., Bourot-Denise, M., Consolmagno, G., Folco, L., Kohout, T., Pesonen, L., Sagnotti, L., 2009, Magnetic classification of stony meteorites: 3. Achondrites. Meteoritics & Planetary Science, 44, 405-427, http://dx.doi.org/10.1111/j.1945-5100.2009.tb00741.x. | |
Warren, P. H., Ulff-Møller, F., Huber, H., Kallemeyn, G. W., 2006, Siderophile geochemistry of ureilites: A record of early stages of planetesimal core formation. Geochimica et Cosmochimica Acta, 70 Issue 8, 15-Apr-06, 2104-2126, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2005.12.026. | |
Singletary, S. J., Grove, T. L., 2003, Early petrologic processes on the ureilite parent body. Meteoritics & Planetary Science, 38, 95-108. | |
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. | |
Clayton, R. N., Mayeda, T. K., 1996, Oxygen isotope studies of achondrites. Geochimica et Cosmochimica Acta, 60 Issue 11, Jun-96, 1999-2017, ISSN 0016-7037, http://dx.doi.org/10.1016/0016-7037(96)00074-9. |