Sample Petrographic Description
Sample Number | PCA 02017 |
Newsletter | 27,1 |
Location | Pecora Escarpment |
Field Number | 13650 |
Dimensions (cm) | 2.0 x 1.5 x 0.5 |
Weight (g) | 2.35 |
Original Classification | Diogenite |
Pairing | PCA 02008; PCA 02017; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 26-29;Ferrosilite (mol%): 17-25 | |
Weathering | |
A/B | |
Fracturing | |
A/B | |
Macroscopic Description - Kathleen McBride | |
The exteriors of these diogenites have smooth, shiny black fusion crust. The interiors are fine-grained, medium gray matrix with light gray and cream colored inclusions. | |
Thin Section Description (,2) - Tim McCoy, Linda Welzenbach | |
These sections show a groundmass of coarse (up to 2 mm) comminuted pyroxene with minor SiO2, olivine (Fa25-29) and plagioclase (An90). Orthopyroxene has a composition of Fs17-26Wo2-3 and an Fe/Mn ratio of ~28-30. The meteorites are diogenites and are probably paired. |
Antarctic Meteorite Images for Sample PCA 02017 | ||||
Lab Photo(s) : | ||||
References for Sample PCA02017 | |
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., Welten, K. C., McSween Jr., H. Y., Viviano, C. E., Caffee, M. W., 2012, Petrologic and textural diversity among the PCA 02 howardite group, one of the largest pieces of the Vestan surface. Meteoritics & Planetary Science, 47, 947-969. | |
Shearer, C. K., Burger, P., Papike, J. J., 2010, Petrogenetic relationships between diogenites and olivine diogenites: Implications for magmatism on the HED parent body. Geochimica et Cosmochimica Acta, 74 Issue 16, 15-Aug-10, 4865-4880, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2010.05.015. |