Sample Petrographic Description
| Sample Number | LAP 02228 |
| Newsletter | 26,2 |
| Location | LaPaz Ice Field |
| Field Number | 15409 |
| Dimensions (cm) | 7.25 x 5.0 x 5.0 |
| Weight (g) | 335.80 |
| Original Classification | CV3 Chondrite |
| Updated Classification | CV 3.7 Chondrite Oxidized A |
| Pairing | LAP 02206; LAP 02228; LAP 04843; |
| Mineral Composition (%Fa & %Fs) | |
| Fayalite (mol%): 1-45;Ferrosilite (mol%): 0-1 | |
| Weathering | |
| B | |
| Fracturing | |
| A/B | |
| Macroscopic Description - Kathleen McBride | |
| The exteriors of these meteorites are covered with a rough, black fusion with polygonal fractures. The interior reveals a medium to dark gray matrix with white, irregularly shaped inclusions. A few dark crystalline clasts are present. Chrondrules are mm sized and are gray or rust in color. | |
| Thin Section Description (,5) - Tim McCoy, Linda Welzenbach | |
| The sections are so similar that a single description suffices. The sections exhibit large chondrules (up to 3 mm) and CAIs in a dark matrix with minor metal and sulfide. Olivines range from Fa0-45, with many Fa0-5, and pyroxenes from Fs0-2. The meteorites are CV3 chondrites. | |
| Reclassification Notes (AMN 46,1) | |
| Reclassification and pairing based on Raman spectroscopy (petrologic type 3.7), and on Ni content of metal and sulfide and magnetic susceptibility (Oxidized A). Details are reported in Righter et al. (2022); doi: 10.1111/maps.13932. | |
| Antarctic Meteorite Images for Sample LAP 02228 | ||||
| Field Photo(s) : | ||||
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| Field photo image(s) courtesy of the ANSMET (ANtarctic Search for METeorites) Program, Case Western Reserve University and the University of Utah | ||||
| Antarctic Meteorite Images for Sample LAP 02228 | ||||
| Lab Photo(s) : | ||||
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| Antarctic Meteorite Images for Sample LAP 02228 | ||||
| Thin Section Photo(s) : | ||||
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| References for Sample LAP02228 | |
| Yesiltas, M., Kebukawa, Y., Glotch, T.D., Zolensky, M., Fries, M., Aysal, N., Tukel, F.S., 2022, Compositional and spectroscopic investigation of three ungrouped carbonaceous chondrites, Meteoritics & Planetary Science, 57:9, 1665-1687, doi: 10.1111/maps.13893. | |
| Yesiltas, M., Young, J., Glotch, T., 2021, Thermal metamorphic history of Antarctic CV3 and CO3 chondrites inferred from the first- and second-order Raman peaks of polyaromatic organic carbon. American Mineralogist, 106, 506-517, doi: 10.2138/am-2021-7507. | |
| Jogo, K., Ito, M., Wakita, S., Kobayashi, S., & Lee, J. I., 2019, Origin of the metamorphosed clasts in the CV 3 carbonaceous chondrite breccias of Graves Nunataks 06101, Vigarano, Roberts Massif 04143, and Yamato-86009. Meteoritics & Planetary Science, 54, 1133-1152. | |
| Ishida, H., Nakamura, T., Miura, H., Kakazu, Y., 2012, Diverse mineralogical and oxygen isotopic signatures recorded in CV3 carbonaceous chondrites. Polar Science, 6 Issues 3-4, August-November 2012, 252-262, ISSN 1873-9652, http://dx.doi.org/10.1016/j.polar.2012.06.002. | |
| Rochette, P., Kohout, T., Pesonen, L., Quirico, E., Sagnotti, L., Skripnik, A., Gattacceca, J., Bonal, L., Bourot-Denise, M., Chevrier, V., Clerc, J. P., Consolmagno, G., Folco, L., Gounelle, M., 2008, Magnetic classification of stony meteorites: 2. Non-ordinary chondrites. Meteoritics & Planetary Science, 43, 959-980, http://dx.doi.org/10.1111/j.1945-5100.2008.tb01092.x. | |