Sample Petrographic Description
Sample Number | LAP 03630 |
Newsletter | 27,3 |
Location | LaPaz Ice Field |
Field Number | 16049 |
Dimensions (cm) | 5.5 x 4.0 x 3.5 |
Weight (g) | 175.67 |
Original Classification | Diogenite |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 24 | |
Weathering | |
A | |
Fracturing | |
A | |
Macroscopic Description - Kathleen McBride | |
The exterior has small patches of chocolate brown crust (<10%) visible on the exterior. Areas without fusion crust show a tan matrix with green clasts visible. The interior matrix is light gray with olive green, angular inclusions. | |
Thin Section Description (,2) - Tim McCoy, Linda Welzenbach | |
The section is dominated by orthopyroxene, with individual grains reaching over 5 mm. The majority of the section consists of smaller (1 mm), equant grains which commonly intersect at 120º triple junctions. Orthopyroxene has a composition of Fs24Wo2 and an Fe/Mn ratio of ~28. The meteorite is a diogenite, although its texture is unusual. |
Antarctic Meteorite Images for Sample LAP 03630 | ||||
Lab Photo(s) : | ||||
References for Sample LAP03630 | |
Burbine, T.H., Buchanan, P.C., Jercinovic, M.J., and Greenwood, R.C., 2023, Determining the Pyroxene Mineralogies of Vestoids. The Planetary Science Journal, 4, 96, https://doi.org/10.3847/PSJ/accb98. | |
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. | |
Schiller, M., Baker, J., Creech, J., Paton, C., Millet, M., Irving, A., Bizzarro, M., 2011, Rapid Timescales for Magma Ocean Crystallization on the Howardite-Eucrite-Diogenite Parent Body. ApJ, 740, L22, http://dx.doi.org/10.1088/2041-8205/740/1/L22. | |
Barrat, J. A., Yamaguchi, A., Greenwood, R. C., Benoit, M., Cotten, J., Bohn, M., Franchi, I. A., 2008, Geochemistry of diogenites: Still more diversity in their parental melts. Meteoritics & Planetary Science, 43, 1759-1775, http://dx.doi.org/10.1111/j.1945-5100.2008.tb00641.x. | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |