Sample Petrographic Description
Sample Number | BUC 10933 |
Newsletter | 36,1 |
Location | Buckley Island |
Field Number | 21432 |
Dimensions (cm) | 8.0 x 6.0 x 5.5 |
Weight (g) | 486.00 |
Original Classification | CR2 Chondrite |
Updated Classification | CV3 Chondrite (Reduced) |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 3-7;Ferrosilite (mol%): 1-3 | |
Weathering | |
B/Ce | |
Fracturing | |
A/B | |
Macroscopic Description - Cecilia Satterwhite | |
Patches of black/brown fusion crust are on the weathered brown exterior (@40%). The dark grey to black matrix has abundant inclusions/chondrules of various colors and sizes. Some areas are weathered brown with rust. This meteorite was difficult to break. | |
Thin Section Description (,2) - Cari Corrigan, Linda Welzenbach, Tim McCoy | |
The section exhibits large (up to 3 mm), poorly-defined chondrules and CAIs in a dark matrix of mafics and FeO-rich phyllosilicate. Metal is found disseminated throughout, along with abundant sulfides, though very few metal rimmed chondrules are seen. Polysynthetically twinned pyroxene is abundant. Olivines range from Fa3-7 and pyroxenes from Fs1-3Wo1-4. The section is heavily weathered. The meteorite is probably a CR2 chondrite, although the extent of aqueous alteration appears to be less than is typical for CR2 chondrites. | |
Reclassification Notes (AMN 46,2) | |
Prestgard et al. (2023) report new oxygen isotope data for CR chondrites, and found three US Antarctic meteorites that are inconsistent with CR2 classification. BUC 10933 was classified in AMN 36 no. 1 as a CR2, and is reclassified as CV reduced. |
Antarctic Meteorite Images for Sample BUC 10933 | ||||
Lab Photo(s) : | ||||
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Antarctic Meteorite Images for Sample BUC 10933 | ||||
Thin Section Photo(s) : | ||||
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References for Sample BUC10933 | |
Dyar, M.D., Wallace, S.M., Burbine, T.H., and Sheldon, D.R., 2023, A machine learning classification of meteorite spectra applied to understanding asteroids. Icarus, 406, 115718, https://doi.org/10.1016/j.icarus.2023.115718. | |
Prestgard, T., Beck, P., Bonal, L., Eschrig, J., Gattacceca, J., Sonzogni, C., and Krämer Ruggiu, L., 2023, The parent bodies of CR chondrites and their secondary history, Meteoritics & Planetary Science, 58, 1117-1148, doi: 10.1111/maps.14048. | |
Zhu, K., Schiller, M., Moynier, F., Groen, M., Alexander, C.M.D., Davidson, J., Schrader, D.L., Bischoff, A., and Bizzarro, M., 2023, Chondrite diversity revealed by chromium, calcium and magnesium isotopes. Geochimica et Cosmochimica Acta, 342, 156–168, https://doi.org/10.1016/j.gca.2022.12.014. | |
Hiroi, T., Ohtsuka, K., Howard, K.T., Robertson, K.R., and Milliken, R.E., Kaiden, H., Imae, N., Misawa, K., Kojima, H., Sasakia, S., Matsuokaa, M., Nakamura, T., Bish, D.L., 2021, UV-visible-infrared spectral survey of Antarctic carbonaceous chondrite chips. Polar Science, 29, 100723, https://doi.org/10.1016/j.polar.2021.100723. | |
Zhu, K., and Becker, H., Moynier, F., Alexander, C.M.O'D., Davidson, J., Schrader, D.L., Zhu, J-M., Wu, G-L., Schiller, M., Bizzarro, M., 2021, Chromium stable isotope panorama of chondrites and implications for early Earth accretion, The Astrophysical Journal, 923:94, doi: 10.3847/1538-4357/ac2570. | |
Mahan, B., Moynier, F., Beck, P., Pringle, E. A., & Siebert, J. , 2018, A history of violence: Insights into post-accretionary heating in carbonaceous chondrites from volatile element abundances, Zn isotopes and water contents. . Geochimica et Cosmochimica Acta, 220, 19-35, http://dx.doi.org/10.1016/j.gca.2017.09.027. | |
Creech, J. B., Moynier, F., & Bizzarro, M. , 2017, Tracing metal–silicate segregation and late veneer in the Earth and the ureilite parent body with palladium stable isotopes. . Geochimica et Cosmochimica Acta, 216, 28-41, http://dx.doi.org/10.1016/j.gca.2017.04.040. | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |