Sample Petrographic Description
Sample Number | LAR 12128 |
Newsletter | 39,1 |
Location | Larkman Nunatak |
Field Number | 23174 |
Dimensions (cm) | 10.0 x 6.0 x 4.0 |
Weight (g) | 222.33 |
Original Classification | EH3 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 0.4;Ferrosilite (mol%): 1 | |
Weathering | |
C | |
Fracturing | |
B/C | |
Macroscopic Description - Cecilia Satterwhite | |
60% of the exterior has brown/black fractured fusion crust with rusty brown weathered areas. Exterior is platy and breaks easily. The interior a rusty brown with metal and weathered inclusions/chondrules. | |
Thin Section Description (,2) - Cari Corrigan, Tim McCoy | |
The section shows an aggregate of chondrules (up to 1.5 mm), chondrule fragments, and pyroxene grains in a matrix of about 30% metal and sulfide. Chondrules contain modest abundances of olivine. Weathering is modest, with staining of some enstatite grains and minor alteration of metal and sulfides. Microprobe analyses show the olivine is Fa0.4 and pyroxene is Fs1. The meteorite is a type 3 enstatite chondrite, probably an EH3. |
Antarctic Meteorite Images for Sample LAR 12128 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample LAR 12128 | ||||
Thin Section Photo(s) : | ||||
References for Sample LAR12128 | |
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. | |
Dunham, E. T., Sheikh, A., Opara, D., Matsuda, N., Liu, M. C., & McKeegan, K. D., 2023, Calcium–aluminum-rich inclusions in non-carbonaceous chondrites: Abundances, sizes, and mineralogy, Meteoritics & Planetary Science, 58, 643-671, doi: 10.1111/maps.13975. |