Sample Petrographic Description
Sample Number | QUE 99005 |
Newsletter | 23,2 |
Location | Queen Alexandra Range |
Field Number | 11669 |
Dimensions (cm) | 5.0 x 2.5 x 3.5 |
Weight (g) | 64.00 |
Original Classification | Eucrite (Brecciated) |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 63 | |
Weathering | |
B | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
A rough black fusion crust covers 75% of the exterior of this achondrite. The fusion crust exhibits polygonal fractures and a few shiny patches. It has a rough texture and the exposed interior is gray. The interior is fine-grained gray matrix. Near the edges are coarse black and white grains. Some black and white clasts are visible within the gray matrix. | |
Thin Section Description - Tim McCoy | |
This section is dominated by fine-grained, quench-textured clasts with pyroxene microphenocrysts set in a cryptocrystalline to devitrified glassy matrix. This material is nearly identical to the unusual eucrite ALHA81001 (Warren and Jerde, 1987, GCA 51, 713-725). Coarser-grained clasts are observed bordering and intermixed with this finer-grained material. Mineral compositions are relatively homogeneous with orthopyroxene (Fs63Wo2), with fine lamellae of augite (Fs28Wo42), and plagioclase (An86-93Or0-1). The Fe/Mn ratio of the pyroxene is ~30. The meteorite is a brecciated eucrite. |
Antarctic Meteorite Images for Sample QUE 99005 | ||||
Lab Photo(s) : | ||||
References for Sample QUE99005 | |
Kennedy, T., Jourdan, F., Eroglu, E., & Mayers, C., 2019, Bombardment history of Asteroid 4 Vesta recorded by brecciated eucrites: Large impact event clusters at 4.50 Ga and discreet bombardment until 3.47 Ga. Geochimica et Cosmochimica Acta, 260, 99–123. | |
Schiller, M., Dallas, J.A., Creech, J., Bizzarro, M., Baker, J.A., 2017, Tracking the formation of magma oceans in the Solar System using stable magnesium isotopes. Geochem. Persp. Let., 3, 22-31. | |
Mittlefehldt, D. W., 2015, Asteroid (4) Vesta: I. The howardite-eucrite-diogenite (HED) clan of meteorites. Chemie der Erde - Geochemistry, 75 Issue 2, Jun-15, 155-183, ISSN 0009-2819, http://dx.doi.org/10.1016/j.chemer.2014.08.002. | |
Beck, A. W., Lawrence, D. J., Peplowski, P. N., Prettyman, T. H., Mccoy, T. J., Mcsween, H. Y., Toplis, M. J., Yamashita, N., 2015, Using HED meteorites to interpret neutron and gamma-ray data from asteroidÿ4 Vesta. Meteoritics & Planetary Science, 50, 1311-1337, http://dx.doi.org/10.1111/maps.12467. | |
Warren, P. H., Kallemeyn, G. W., Huber, H., Ulff-Møller, F., Choe, W., 2009, Siderophile and other geochemical constraints on mixing relationships among HED-meteoritic breccias. Geochimica et Cosmochimica Acta, 73 Issue 19, 1-Oct-09, 5918-5943, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2009.06.030. |