Sample Petrographic Description
Sample Number | LAP 02382 |
Newsletter | 27,3 |
Location | LaPaz Ice Field |
Field Number | 15979 |
Dimensions (cm) | 4.5 x 3.5 x 2.5 |
Weight (g) | 74.32 |
Original Classification | Ureilite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 12-21;Ferrosilite (mol%): 15-18 | |
Weathering | |
B | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
90% of the exterior surface has thick black fusion crust. The interior has a black matrix with millimeter sized light colored inclusions. | |
Thin Section Description (,2) - Tim McCoy, Linda Welzenbach | |
The section consists of an aggregate of small equant olivine and pyroxene grains up to 0.5 mm across. Individual olivine grains are rimmed by carbon-rich material containing traces of metal. Olivines have cores of Fa21, with rims reduced to Fa12. Pyroxene is pigeonite of Fs18,Wo5. A single augite grain had a composition of Fs15Wo41. The meteorite is a ureilite. |
Antarctic Meteorite Images for Sample LAP 02382 | ||||
Lab Photo(s) : | ||||
References for Sample LAP02382 | |
Goodrich, C. A., Harlow, G. E., Van Orman, J. A., Sutton, S. R., Jercinovic, M. J., Mikouchi, T., 2014, Petrology of chromite in ureilites: Deconvolution of primary oxidation states and secondary reduction processes. Geochimica et Cosmochimica Acta, 135, 15-Jun-14, 126-169, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2014.02.028. | |
Goodrich, C. A., Ash, R. D., Van Orman, J. A., Domanik, K., McDonough, W. F., 2013, Metallic phases and siderophile elements in main group ureilites: Implications for ureilite petrogenesis. Geochimica et Cosmochimica Acta, 112, 1-Jul-13, 340-373, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2012.06.022. | |
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. |