Sample Petrographic Description
Sample Number | LAP 03645 |
Newsletter | 28,1 |
Location | LaPaz Ice Field |
Field Number | 16023 |
Dimensions (cm) | 7.5 x 3.0 x 2.5 |
Weight (g) | 127.56 |
Original Classification | R Chondrite |
Pairing | LAP 02238; LAP 03645; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 7-43 | |
Weathering | |
B | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
Black fusion crust with polygonal fractures covers 60% of the exterior. The interior has a medium gray matrix with black and gray inclusions. This meteorite has a high metal content with rust and an oxidation rind. | |
Thin Section Description (,2) - Linda Welzenbach, Tim McCoy | |
This meteorite is similar to and almost certainly paired with LAP 02238, the original description of which is given below: The section consists of relatively few chondrules (up to 1 mm) and chondrule fragments in a fine-grained brecciated matrix, with very abundant iron sulfide and pentlandite and lesser abundances of oxides and graphite. Mineral compositions are olivine of Fa27-46 (most Fa38-40), orthopyroxene of Fs18-36Wo1-3 and augite Fs9-15Wo44-48. The olivine composition is similar to R chondrites, although graphite has not been previously reported in this group. |
Antarctic Meteorite Images for Sample LAP 03645 | ||||
Lab Photo(s) : | ||||
References for Sample LAP03645 | |
Isa, J., Rubin, A. E., Wasson, J. T., 2014, R-chondrite bulk-chemical compositions and diverse oxides: Implications for parent-body processes. Geochimica et Cosmochimica Acta, 124, 1-Jan-14, 131-151, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2013.09.018. | |
Bischoff, A., Vogel, N., Roszjar, J., 2011, The Rumuruti chondrite group. Chemie der Erde - Geochemistry, 71 Issue 2, May-11, 101-133, ISSN 0009-2819, http://dx.doi.org/10.1016/j.chemer.2011.02.005. | |
Rochette, P., Kohout, T., Pesonen, L., Quirico, E., Sagnotti, L., Skripnik, A., Gattacceca, J., Bonal, L., Bourot-Denise, M., Chevrier, V., Clerc, J. P., Consolmagno, G., Folco, L., Gounelle, M., 2008, Magnetic classification of stony meteorites: 2. Non-ordinary chondrites. Meteoritics & Planetary Science, 43, 959-980, http://dx.doi.org/10.1111/j.1945-5100.2008.tb01092.x. | |
Rubin, A. E., Huber, H., 2005, A weathering index for CK and R chondrites. Meteoritics & Planetary Science, 40, 1123-1130, http://dx.doi.org/10.1111/j.1945-5100.2005.tb00178.x. | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |