Sample Petrographic Description
Sample Number | LAR 12252 |
Newsletter | 39,2 |
Location | Larkman Nunatak |
Field Number | 23702 |
Dimensions (cm) | 5.5 x 4.0 x 4.0 |
Weight (g) | 147.50 |
Original Classification | EH3 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 0-4 | |
Weathering | |
A | |
Fracturing | |
A/B | |
Macroscopic Description - Rachel Funk | |
Black/brown glossy fusion crust covers the exterior, with several small fractures and red and orange rust haloes up to 3 mm in size. The matrix is black/brown with shiny metal, 2 mm sized white inclusions and minor amounts of rust. | |
Thin Section Description (,2) - Cari Corrigan, Tim McCoy | |
The section shows an aggregate of chondrules (up to 1 mm), chondrule fragments, and pyroxene grains in a matrix of about 30% metal and sulfide. Chondrules contain moderate to small abundances of olivine. Weathering is modest, with staining of some enstatite grains and minor alteration of metal and sulfides. Metal contains 2.2 wt. % SI. Microprobe analyses show the pyroxenes are Fs0-4. The meteorite is a type 3 enstatite chondrite, probably EH3. |
Antarctic Meteorite Images for Sample LAR 12252 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample LAR 12252 | ||||
Thin Section Photo(s) : | ||||
References for Sample LAR12252 | |
Barrat, J.-A., Bischoff, A., and Zanda, B., 2023, Trace element redistributions during metamorphism of E-chondrites: Implications for reduced bodies and the Earth, Geochimica et Cosmochimica Acta, 356, 51-65, https://doi.org/10.1016/j.gca.2023.07.003. | |
Zhao, C., Lodders, K., Bloom, H., Chen, H., Tian, Z., Koefoed, P., Petö, M.K., and Wang, K., 2020, Potassium isotopic compositions of enstatite meteorites. Meteoritics & Planetary Science, 55, 1404–1417, doi: 10.1111/maps.13358. |