Sample Petrographic Description
Sample Number | LAP 031173 |
Newsletter | 29,1 |
Location | LaPaz Ice Field |
Field Number | 16105 |
Dimensions (cm) | 1.5 x 1.0 x 0.5 |
Weight (g) | 1.36 |
Original Classification | H Chondrite (Impact Melt) |
Pairing | LAP 031173; LAP 031308; LAP 04642; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 19;Ferrosilite (mol%): 17 | |
Weathering | |
C | |
Fracturing | |
C | |
Macroscopic Description - Kathleen McBride | |
The exteriors are covered with brown/black fusion crust with oxidation halos. The interiors are rusty brown with a brittle texture. | |
Thin Section Description (,2) - Tim McCoy, Linda Welzenbach | |
These sections are so similar that a single description suffices. The meteorites exhibit a microcrystalline silicate matrix including rounded metal-sulfide blebs reaching 20 microns and relict grains, chondrules and clasts reaching up to a few mm. Mafic silicate compositions (Fa19, Fs17) indicate they are of H chondrite parentage and textures suggest they are impact melt breccias. |
Antarctic Meteorite Images for Sample LAP 031173 | ||||
Lab Photo(s) : | ||||
References for Sample LAP031173 | |
Swindle, T. D., Kring, D. A., Weirich, J. R., 2013, 40Ar/39Ar ages of impacts involving ordinary chondrite meteorites. Geological Society, London, Special Publications, 378, 2013, SP378-6. | |
Wittman, A., Swindle, T. D., Cheek, L. C., Frank, E. A., Kring, D. A., 2010, Impact cratering on the H chondrite parent asteroid. Journal of Geophysical Research: Planets, 115 (E7), 2010, 1991-2012. | |
Swindle, T. D., Isachsen, C. E., Weirich, J. R., Kring, D. A., 2009, 40Ar-39Ar ages of H-chondrite impact melt breccias. Meteoritics & Planetary Science, 44, 747-762, http://dx.doi.org/10.1111/j.1945-5100.2009.tb00766.x. |