Sample Petrographic Description
Sample Number | EET 96031 |
Newsletter | 21,1 |
Location | Elephant Moraine |
Field Number | 10687 |
Dimensions (cm) | 7.5 x 5.0 x 4.0 |
Weight (g) | 414.00 |
Original Classification | H4 Chondrite |
Updated Classification | H4 Chondrite (Anomalous) |
Pairing | EET 96031; EET 96037; EET 96040; EET 96047; EET 96123; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 16;Ferrosilite (mol%): 15 | |
Weathering | |
B/C | |
Fracturing | |
A | |
Macroscopic Description - Kathleen McBride | |
The exteriors of these chondrites are covered with thin, patchy black fusion crust. They all have iridescent oxidation haloes and a few fractures. The interior is fine grained with some dark gray matrix visible. Some rust colored grains and metal are present. These meteorites are hard and coherent. | |
Thin Section Description (,2) - Tim McCoy | |
These four meteorites are likely paired and a common description is given. The sections show a close-packed aggregate of chondrules (usually less than 1 mm across), chondrule fragments and mineral grains in a dark matrix with abundant metal and troilite. The meteorite is moderately weathered and shocked. Polysynthetically twinned pyroxene is common. All four meteorites have olivine (Fa15-16) and pyroxene compositions (Fs13-14) which are below the range typical for H chondrites and similar to a small group of chondrites such as Willaroy (1993, GCA 57, 1867). The meteorites are unusual H4 chondrites. | |
Reclassification Notes (AMN 33,1) | |
anomalous due to reduced nature (AMN 21(1)) |
Antarctic Meteorite Images for Sample EET 96031 | ||||
Thin Section Photo(s) : | ||||
References for Sample EET96031 | |
Greenwood, R.C., Burbine, T.H., and Franchi, I.A., 2020, Linking Asteroids and meteorites to the primordial planetesimal population. Geochimica et Cosmochimica Acta, 277, 377-406, doi: 10.1016/j.gca.2020.02.004. | |
McCoy, T.J., 2015, Meteorite Misfits: Fuzzy Clues to Solar System Processes. In Righter, K., Corrigan, C.M., McCoy, T.J., and Harvey, R.P. Meteorites: A Pictorial Guide to the Collection, First Edition, AGU Wiley, pp. 145-152. | |
Troiano, J., Rumble III, D., Rivers, M. L., Friedrich, J. M., 2011, Compositions of three low-FeO ordinary chondrites: Indications of a common origin with the H chondrites. Geochimica et Cosmochimica Acta, 75 Issue 21, 1-Nov-11, 6511-6519, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2011.08.033. |