Sample Petrographic Description
Sample Number | LAP 031323 |
Newsletter | 29,1 |
Location | LaPaz Ice Field |
Field Number | 16647 |
Dimensions (cm) | 1.5 x 1.5 x 1.0 |
Weight (g) | 3.13 |
Original Classification | Acapulcoite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 13;Ferrosilite (mol%): 12 | |
Weathering | |
C | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
50% of the exterior has brown/black fusion crust. The rusty, granular textured interior has a high metal content. | |
Thin Section Description (,2) - Tim McCoy, Linda Welzenbach | |
The section consists of an equigranular mixture of olivine (Fa13), orthopyroxene (Fs12Wo2), clinopyroxene (Fs5Wo43), plagioclase (An15Or4), metal and troilite. Mafic grain sizes are ~100 microns, triple junctions are common and plagioclase is interstitial to and includes mafic silicates. The rock is an acapulcoite, but similar in texture to the intermediate members of the acapulcoite-lodranite clan EET 84302 and GRA 95209. |
Antarctic Meteorite Images for Sample LAP 031323 | ||||
Lab Photo(s) : | ||||
References for Sample LAP031323 | |
Tomkins, A.G., Johnson, T.E., Mitchell, J.T., 2020, A review of the chondrite-achondrite transition, and a metamorphic facies series for equilibrated primitive stony meteorites. Meteoritics & Planetary Science, 55, 857-885, doi: 10.1111/maps.13472. | |
Keil, K., McCoy, T.J., 2018, Acapulcoite-lodranite meteorites: Ultramafic asteroidal partial melt residues. Chemie der Erde, 78, 153-203, https://doi.org/10.1016/j.chemer.2017.04.004. | |
Rochette, P., Gattacceca, J., Bourot-Denise, M., Consolmagno, G., Folco, L., Kohout, T., Pesonen, L., Sagnotti, L., 2009, Magnetic classification of stony meteorites: 3. Achondrites. Meteoritics & Planetary Science, 44, 405-427, http://dx.doi.org/10.1111/j.1945-5100.2009.tb00741.x. |