Sample Petrographic Description
Sample Number | LAP 02233 |
Newsletter | 26,2 |
Location | LaPaz Ice Field |
Field Number | 15156 |
Dimensions (cm) | 3.0 x 2.5 x 2.0 |
Weight (g) | 18.06 |
Original Classification | Aubrite |
Pairing | LAP 02233; LAP 031269; LAP 031372; LAP 03780; |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 0 | |
Weathering | |
B | |
Fracturing | |
C | |
Macroscopic Description - Kathleen McBride | |
This meteorite has no fusion crust. The interior is striated, snow white crystalline material that is loosely held together. There are numerous fractures and canyons. Accessory minerals are rounded, black and rootbeer colored (1-2 mm in size) crystals. Small areas of rust are present. | |
Thin Section Description (,4) - Tim McCoy, Linda Welzenbach | |
The section consists of an aggregate of coarse (up to 5 mm), heavily shocked enstatite grains with minor to trace abundances of diopside, Si-bearing metal, Ti-bearing troilite, oldhamite, and a Mn,Mg,Fe-sulfide. Silicates are essentially FeO-free enstatite (Fs0Wo1) and diopside (Fs0Wo45). The meteorite is an aubrite. |
Antarctic Meteorite Images for Sample LAP 02233 | ||||
Lab Photo(s) : | ||||
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References for Sample LAP02233 | |
Peterson, L.D., Newcombe, M.E., Alexander, C.M.D., Wang, J., Klein, F., Bekaert, D.V., and Nielsen, S.G., 2023, The H content of aubrites: An evaluation of bulk versus in situ methods for quantifying water in meteorites. Earth and Planetary Science Letters, 620, 118341, https://doi.org/10.1016/j.epsl.2023.118341. | |
Wilbur, Z.E., Barnes, J.J., Dygert, N., Zeigler, R.A., Turrin, B.D., and McCoy C., Udry, A., McCubbin, F.M., Vander Kaaden, K.E., Defelice, C., Ziegler, K., Ross, D.K., McCoy, T.J., Gross, J., 2022, The effects of highly reduced magmatism revealed through aubrites, Meteoritics & Planetary Science, 57:7, 1387-1420, doi: 10.1111/maps.13823. | |
Rubin, A. E., 2015, Shock and annealing in aubrites: Implications for parent-body history. Meteoritics & Planetary Science, 50, 1217-1227, http://dx.doi.org/10.1111/maps.12464. | |
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. | |
Miura, Y. N., Hidaka, H., Nishiizumi, K., Kusakabe, M., 2007, Noble gas and oxygen isotope studies of aubrites: A clue to origin and histories. Geochimica et Cosmochimica Acta, 71 Issue 1, 1-Jan-07, 251-270, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2006.07.040. |