Sample Petrographic Description
Sample Number | ALH 83009 |
Newsletter | 8,1 |
Location | Allan Hills |
Field Number | 2100 |
Dimensions (cm) | 1.5 x 1.0 x 0.5 |
Weight (g) | 1.70 |
Original Classification | Aubrite |
Pairing | ALH 83009; ALH 83015; ALH 84007; ALH 84008; ALH 84009; ALH 84010; ALH 84011; ALH 84012; ALH 84013; ALH 84014; ALH 84015; ALH 84016; ALH 84017; ALH 84018; ALH 84019; ALH 84020; ALH 84021; ALH 84023; ALH 84024; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 0;Ferrosilite (mol%): 0 | |
Weathering | |
A/B | |
Fracturing | |
A | |
Macroscopic Description - Roberta Score | |
This specimen is white in color and is identical to ALH 83015. | |
Thin Section Description (,1) - Jeremy Delaney | |
This is a coarse-grained, brecciated aubrite with several unbrecciated lithic fragments preserved. Orthopyroxene grains have interfingering texture. One grain with inclined extinction appears to be clinoenstatite. Generally no exsolution was observed. One small calcic pyroxene was observed in a 1 mm + orthopyroxene grain containing needle-like inclusions. Some orthopyroxene grains contain rounded melt pockets with extremely fine-grained needle-like crystallites of unidentified silicates. Orthopyroxene is En99.6Wo0.34 and feldspar is Ab90Or3.2. Other phases include daubreelite, alabandite, Fe-Ni metal and Ti-bearing troilite. |
Antarctic Meteorite Images for Sample ALH 83009 | ||||
Thin Section Photo(s) : | ||||
References for Sample ALH83009 | |
Corrigan, C.M., Welzenbach, L.C., Righter, K., McBride, K.M., McCoy, T.J., Harvey, R.P., and Satterwhite, C.E., 2015, A Statistical Look at the U.S. Antarctic Meteorite Collection. 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. 173-187. | |
Keil, K., 2010, Enstatite achondrite meteorites (aubrites) and the histories of their asteroidal parent bodies. Chemie der Erde - Geochemistry, 70 Issue 4, 2010, 295-317, ISSN 0009-2819, http://dx.doi.org/10.1016/j.chemer.2010.02.002. | |
Marvin, U. B., MacPherson, G. J., 1989, Field and Laboratory Investigations of Meteorites from Victoria Land and the Thiel Mountains Region, Antarctica 1982-1983 and 1983-1984. Smithsonian Contributions to the Earth Sciences Number, 28, 146. |