Sample Petrographic Description
Sample Number | MET 96515 |
Newsletter | 21,2 |
Location | Meteorite Hills |
Field Number | 10723 |
Dimensions (cm) | 10.0 x 5.0 x 4.5 |
Weight (g) | 308.70 |
Original Classification | L3.5 Chondrite |
Updated Classification | L3.10 Chondrite |
Pairing | MET 96503; MET 01051; MET 01056; MET 01057; MET 96515; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 1-30;Ferrosilite (mol%): 3-16 | |
Weathering | |
A/B | |
Fracturing | |
A | |
Macroscopic Description - Kathleen McBride | |
The exterior of this ordinary chondrite has brown/black fusion crust with striations. The surface is smooth and slightly shiny with some pits. The interior has a dark matrix with some rust and numerous chondrules (1 cm in diameter). The chondrules are cream, white and tan, some are rusty in color. Metal is present and inclusions are irregularly shaped. | |
Thin Section Description (,2) - Tim McCoy | |
The section exhibits numerous large, well-defined chondrules (up to 2 mm) in a black matrix of fine-grained silicates, metal and troilite. Only weak shock effects are present. Polysynthetically twinned pyroxene is extremely abundant. Silicates are unequilibrated; olivines range from Fa1-30 and pyroxenes from Fs3-16. Weathering is pervasive. The meteorite is probably an L3 chondrite and of moderate subtype (3.5). | |
Reclassification Notes (AMN 44,2) | |
Reclassified as an L3.10 Chondrite based on Cr contents of Type II chondrule olivine. Pairing groups adjusted based on olivine composition and recovery location. Righter, K., Schutt, J., Lunning, N., Harvey, R., & Karner, J. (2021a) Identification and pairing reassessment of unequilibrated ordinary chondrites from four Antarctic dense collection areas. Meteoritics & Planetary Science 56, 1556-1578. | |
Notes | |
Righter et al. (2021) proposed that MET 96503, MET 96515, MET 01051, MET 01056, and MET 01057 are all paired and type L3.10. AMN 45, no. 2. |
Antarctic Meteorite Images for Sample MET 96515 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample MET 96515 | ||||
Thin Section Photo(s) : | ||||
References for Sample MET96515 | |
Dunham, E. T., Sheikh, A., Opara, D., Matsuda, N., Liu, M. C., & McKeegan, K. D., 2023, Calcium–aluminum-rich inclusions in non-carbonaceous chondrites: Abundances, sizes, and mineralogy, Meteoritics & Planetary Science, 58, 643-671, doi: 10.1111/maps.13975. | |
Righter, K., Schutt, J., Lunning, N., Harvey, R, and Karner, J., 2021, Identification and pairing reassessment of unequilibrated ordinary chondrites from four Antarctic dense collection areas. Meteoritics & Planetary Science, 56, 1556-1573, doi: 10.1111/maps.13707. | |
Ruzicka, A. M., Greenwood, R. C., Armstrong, K., Schepker, K. L., & Franchi, I. A., 2019, Petrology and oxygen isotopic composition of large igneous inclusions in ordinary chondrites: Early solar system igneous processes and oxygen reservoirs. Geochimica et Cosmochimica Acta, 266, 497-528, https://doi.org/10.1016/j.gca.2019.01.017. | |
Aleon, J., 2010, Multiple origins of nitrogen isotopic anomalies in meteorites and comets. The Astrophysical Journal, 722, 1342–1351, doi:10.1088/0004-637X/722/2/1342. | |
Busemann, H., Alexander, C. M. O'D., Nittler, L. R., 2007, Characterization of insoluble organic matter in primitive meteorites by microRaman spectroscopy. Meteoritics & Planetary Science, 42, 1387-1416, http://dx.doi.org/10.1111/j.1945-5100.2007.tb00581.x. | |
Wang, M. S., Lipschutz, M. E., 2007, Trace elements in primitive meteorites-VII Antarctic unequilibrated ordinary chondrites. Geochimica et Cosmochimica Acta, 71 Issue 4, 15-Feb-07, 1062-1073, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2006.10.009. | |
Benoit, P. H., Akridge, G. A., Ninagawa, K., Sears, D. W. G., 2002, Thermoluminescence sensitivity and thermal history of type 3 ordinary chondrites: Eleven new type 3.0-3.1 chondrites and possible explanations for differences among H, L, and LL chondrites. Meteoritics & Planetary Science, 37, 793-805. |