Sample Petrographic Description
Sample Number | BTN 00302 |
Newsletter | 25,2 |
Location | Bates Nunataks |
Field Number | 12012 |
Dimensions (cm) | 3.0 x 2.5 x 2.25 |
Weight (g) | 37.06 |
Original Classification | H3.3 Chondrite |
Pairing | BTN 00301; BTN 00302; BTN 00303; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 1-32;Ferrosilite (mol%): 4-19 | |
Weathering | |
B | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
The exterior of these chondrites have approximately 50% brown/black fusion crust with polygonal fractures and oxidation haloes. The interiors are composed of a black matrix with numerous chondrules that are gray, white and rust in color. The size range is 1-2 mm in diameter. There are various odd shaped inclusions 1-3 mm in length of the same colors as well as some that are tan in color. These meteorites are hard. | |
Thin Section Description (,2) - Gretchen Benedix, Linda Welzenbach, Tim McCoy | |
These sections exhibit numerous small, well-defined chondrules (up to 1.5 mm) in a black matrix of fine-grained silicates, metal and troilite. Weak shock effects are present. Polysynthetically twinned pyroxene is extremely abundant. Silicates are unequilibrated; olivines range from Fa1-38 and pyroxenes from Fs2-21. The meteorites are H3 chondrites (estimated subtype 3.3). |
Antarctic Meteorite Images for Sample BTN 00302 | ||||
Lab Photo(s) : | ||||
References for Sample BTN00302 | |
Eschrig, J., Bonal, L., Mahlke, M., Carry,B., Beck, P., Gattacceca, J., 2022, Investigating S-type asteroid surfaces through reflectance spectra of ordinary chondrites, Icarus, 381. | |
Eschrig, J., Bonal, L., Beck, P., Prestgard, T.J., 2021, Spectral reflectance analysis of type 3 carbonaceous chondrites and search for their asteroidal parent bodies. Icarus, 354, 114034, https://doi.org/10.1016/j.icarus.2020.114034. | |
Bonal, L., Quirico, E., Flandinet, L., Montagnac, G., 2016, Thermal history of type 3 chondrites from the Antarctic meteorite collection determined by Raman spectroscopy of their polyaromatic carbonaceous matter. Geochimica et Cosmochimica Acta, 189, 312-337. | |
Vernazza, P., and M. Lockhart , B. Zanda, R. P. Binzel, T. Hiroi, F. E. DeMeo, M. Birlan, R. Hewins, L. Ricci, P. Barge, 2014, Multiple and fast: The accretion of ordinary chondrite parent bodies. . The Astrophysical Journal , 791, 120-131, https://doi.org/10.1088/0004-637X/791/2/120. | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |