Sample Petrographic Description
Sample Number | LAR 06279 |
Newsletter | 33,1 |
Location | Larkman Nunatak |
Field Number | 19898 |
Dimensions (cm) | 9.5 x 6.5 x 4.0 |
Weight (g) | 729.80 |
Original Classification | LL3.8 Chondrite |
Pairing | LAR 06279; LAR 06283; LAR 06301; LAR 06320; LAR 06343; LAR 06469; LAR 06674; LAR 06772; LAR 06774; LAR 12034; LAR 12075; LAR 12078; LAR 12180; LAR 12203; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 14-40;Ferrosilite (mol%): 6-19 | |
Weathering | |
B | |
Fracturing | |
A | |
Macroscopic Description - Cecilia Satterwhite | |
These chondrites all have black fusion crust with rusty areas and oxidation haloes. Areas without fusion crust are brown. The interior is a gray to black matrix with some oxidation and metal. Inclusions and chondrules are visible on the exterior as well as the interior and are lighter than the matrix and vary in size. | |
Thin Section Description (,2) - Cari Corrigan, Tim McCoy, Linda Welzenbach | |
The sections exhibit numerous large, well-defined chondrules (up to 1.5 mm) and occasional melt clasts in a matrix of fine-grained silicates, metal, and troilite. Weak shock effects are present. Polysynthetically twinned pyroxene is abundant. Silicates are unequilibrated; olivines range from Fa2-44 and pyroxenes from Fs3-28. The meteorites are LL3 chondrites (estimated subtype 3.8). | |
Notes | |
There are 14 LL3.8 chondrites that were recovered from a small area within the LAR dense collection area. These were announced in earlier newsletters and were not all paired with each other. Inspection of the field map for all these samples indicates they were recovered within 1 km of each other, and likely all paired together. Since they were classified and announced in small batches and over an 8 year period, they were not recognized as pairs until some time had passed. These include LAR from the 06 season 279, 283, 301, 320, 343, 469, 674, 772, 774, and from the 12 season 034, 075, 078, 180 and 203. |
Antarctic Meteorite Images for Sample LAR 06279 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample LAR 06279 | ||||
Thin Section Photo(s) : | ||||
References for Sample LAR06279 | |
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. |