Sample Petrographic Description
Sample Number | EET 83248 |
Newsletter | 9,1 |
Location | Elephant Moraine |
Field Number | 1364 |
Dimensions (cm) | 3.5 x 3.0 x 2.5 |
Weight (g) | 39.20 |
Original Classification | H3 Chondrite |
Updated Classification | H3.5 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 3-24;Ferrosilite (mol%): 3-23 | |
Weathering | |
B | |
Fracturing | |
A | |
Macroscopic Description - Carol Schwarz | |
Black fusion crust, iridescent on one face, covers all but one side of this smooth specimen. The fracture surface is very dark and iridescent with a few millimeter sized chondrules visible. A few small yellowish-colored chondrules/clasts are visible in the dark matrix that makes up the interior of this meteorite. EET83248 is very coherent. | |
Thin Section Description (,3) - Brian Mason | |
The section shows a close-packed aggregate of chondrules (0.1-1.2 mm diameter), chondrule fragments, and irregular crystal aggregates, with interstitial nickel-iron and troilite and a small amount of dark fine-grained matrix. Chondrule types include granular and porphyritic olivine and olivine-pyroxene, barred olivine, and fine-grained and radiating pyroxene. Weathering is extensive, with brown limonitic staining throughout the section. Microprobe analyses show olivine ranging in composition from Fa3 to Fa24, with a mean of Fa14 (CV FeO is 45); the pyroxene is clinobronzite ranging in composition from Fs3 to Fs23. These ranges in composition indicate type 3, and the amount of nickel-iron suggests H group; the meteorite is therefore tentatively classed as an H3 chondrite. | |
Reclassification Notes (AMN OUTSIDE) | |
Classification updated to H3.5 in Meteoritical Bulletin 76. |
Antarctic Meteorite Images for Sample EET 83248 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample EET 83248 | ||||
Thin Section Photo(s) : | ||||
References for Sample EET83248 | |
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. | |
Sears, D. W. G., Hasan, F. A., Batchelor, J. D., Lu, J., 1991, Chemical and physical studies of type 3 chondrites. XI-Metamorphism, pairing, and brecciation of ordinary chondrites. Proceedings Lunar and Planetary Science Conference, 21, 493-512. | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |