Sample Petrographic Description
Sample Number | LAP 031135 |
Newsletter | 29,1 |
Location | LaPaz Ice Field |
Field Number | 16617 |
Dimensions (cm) | 1.75 x 1.0 x 0.75 |
Weight (g) | 2.73 |
Original Classification | R Chondrite |
Updated Classification | R4 Chondrite |
Pairing | LAP 031135; LAP 031156; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 40;Ferrosilite (mol%): 21-30 | |
Weathering | |
A | |
Fracturing | |
A | |
Macroscopic Description - Kathleen McBride | |
Exteriors are covered with fractured black fusion crust. The interiors consist of fine grained gray matrix with dark gray inclusions. | |
Thin Section Description (,2) - Tim McCoy, Linda Welzenbach | |
The sections are so similar that single description suffices. The sections consist of ~50% of well-defined, small (up to 1 mm) chondrules set in a slightly recrystallized matrix of silicates and sulfides (both troilite and pentlandite). Olivine is homogeneous (Fa39-40) and pyroxene exhibits a small range (Fs21-31). The meteorites are R chondrites, probably of petrologic type 4. | |
Reclassification Notes (AMN 31,1) | |
Reclassified as R4 Chondrite in AMN 31,1. |
Antarctic Meteorite Images for Sample LAP 031135 | ||||
Lab Photo(s) : | ||||
References for Sample LAP031135 | |
Simkus, D. N., Aponte, J. C., Elsila, J. E., Parker, E. T., Glavin, D. P., & Dworkin, J. P., 2019, Methodologies for Analyzing Soluble Organic Compounds in Extraterrestrial Samples: Amino Acids, Amines, Monocarboxylic Acids, Aldehydes, and Ketones. Life, 9, 47. | |
Burton, A. S., Mclain, H., Glavin, D. P., Elsila, J. E., Davidson, J., Miller, K. E., Andronikov, A. V., Lauretta, D., Dworkin, J. P., 2015, Amino acid analyses of R and CK chondrites. Meteoritics & Planetary Science, 50, 470-482. | |
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. |