Sample Petrographic Description
Sample Number | LAP 04721 |
Newsletter | 31,1 |
Location | LaPaz Ice Field |
Field Number | 17613 |
Dimensions (cm) | 3.8 x 3.0 x 2.0 |
Weight (g) | 34.99 |
Original Classification | CR2 Chondrite |
Pairing | LAP 04720; LAP 04721; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 1-68;Ferrosilite (mol%): 1-2 | |
Weathering | |
B/C | |
Fracturing | |
A/B | |
Macroscopic Description - Cecilia Satterwhite | |
These carbonaceous chondrites have black, fractured fusion crust with oxidation haloes. The interiors are black with abundant inclusions and chondrules. Some weathering is visible. | |
Thin Section Description (,2) - McCoy, Linda Welzenbach, Cari Corrigan | |
The sections exhibit mm-sized, well-defined, metal-rich chondrules and CAI’s in a dark matrix of FeO-rich phyllosilicate. Weathering is locally extensive. Silicates are unequilibrated; olivines range from Fa1-68, with most Fa0-2, and pyroxenes from Fs1-3. The meteorites are CR2 chondrites. |
Antarctic Meteorite Images for Sample LAP 04721 | ||||
Thin Section Photo(s) : | ||||
References for Sample LAP04721 | |
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. |