Sample Petrographic Description
Sample Number | LAR 12001 |
Newsletter | 39,1 |
Location | Larkman Nunatak |
Field Number | 23134 |
Dimensions (cm) | 18.0 x 14.0 x 15.0 |
Weight (g) | 6328.20 |
Original Classification | EH3 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 3;Ferrosilite (mol%): 0-2 | |
Weathering | |
Be | |
Fracturing | |
B/C | |
Macroscopic Description - Mitchell Haller | |
Exterior of this heavily fractured meteorite has 75% brown/black fusion crust with evaporites and some orange shiny rusty spots. The interior is a dark gray matrix with shiny metal and weathered orange clasts and chondrules. Areas of the interior are heavily weathered. | |
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 small 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 Fa3 and pyroxene is Fs0-2. The meteorite is a type 3 enstatite chondrite, probably an EH3. |
Antarctic Meteorite Images for Sample LAR 12001 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample LAR 12001 | ||||
Thin Section Photo(s) : | ||||
References for Sample LAR12001 | |
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. | |
Dyar, M.D., Wallace, S.M., Burbine, T.H., and Sheldon, D.R., 2023, A machine learning classification of meteorite spectra applied to understanding asteroids. Icarus, 406, 115718, https://doi.org/10.1016/j.icarus.2023.115718. | |
Hellmann, J.L., Hopp, T., Burkhardt, C., Becker, H., Fischer-Godde, M., and Kleine, T., 2021, Tellurium isotope cosmochemistry: Implications for volatile fractionation in chondrite parent bodies and origin of the late veneer. Geochimica et Cosmochimica Acta, 309, 313–328, https://doi.org/10.1016/j.gca.2021.06.038. | |
Simkus, D.N., Aponte, J.C., Elsila, J.E., McLain, H.L., Parker, E.T., Dworkin, J.P., and Glavin, D.P., 2021, Low total abundances and a predominance of n-ω-amino acids in enstatite chondrites: Implications for thermal stability of amino acids in the inner solar system. Meteoritics & Planetary Science, 56, 2118-2127, doi: 10.1111/maps.13757. | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |