Sample Petrographic Description
Sample Number | LAP 04592 |
Newsletter | 30,2 |
Location | LaPaz Ice Field |
Field Number | 17458 |
Dimensions (cm) | 2.5 x 2.5 x 1.5 |
Weight (g) | 13.06 |
Original Classification | CR2 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 1-3;Ferrosilite (mol%): 1-6 | |
Weathering | |
B/C | |
Fracturing | |
A/B | |
Macroscopic Description - Kathleen McBride | |
The exterior is covered completely with brown thick fusion crust and polygonal fractures. The interior is black with an oxidation rind and rusty haloes. Some dark chondrules are visible. | |
Thin Section Description (,2) - Tim McCoy, Linda Welzenbach | |
The section exhibits medium, well-defined, metal-rich chondrules and CAI's in a dark, altered matrix that is particularly abundant. The section shows a prominent flattening and alignment, probably from shock. Silicates are unequilibrated; olivines range from Fa1-3 and pyroxenes from Fs1-6Wo1. The meteorite is a CR2 chondrite. |
Antarctic Meteorite Images for Sample LAP 04592 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample LAP 04592 | ||||
Thin Section Photo(s) : | ||||
References for Sample LAP04592 | |
Harju, E. R., Rubin, A. E., Ahn, I., Choi, B.-G., Ziegler, K., Wasson, J. T., 2014, Progressive aqueous alteration of CR carbonaceous chondrites. Geochimica et Cosmochimica Acta, 139, 15-Aug-14, 267-292, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2014.04.048. | |
Jacquet, E., Paulhiac-Pison, M., Alard, O., Kearsley, A. T., Gounelle, M., 2013, Trace element geochemistry of CR chondrite metal. Meteoritics & Planetary Science, 48, 1981-1999, http://dx.doi.org/10.1111/maps.12212. | |
Briani, G., Kearsley, A. T., Russell, S. S., Quirico, E., Gounelle, M., Paulhiac-Pison, M., Montagnac, G., Beck, P., Orthous-Daunay, F. R., Bonal, L., Jacquet, E., 2013, Short duration thermal metamorphism in CR chondrites. Geochimica et Cosmochimica Acta, 122, 1-Dec-13, 267-279, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2013.08.022. |