Sample Petrographic Description
Sample Number | LAP 031308 |
Newsletter | 29,2 |
Location | LaPaz Ice Field |
Field Number | 16735 |
Dimensions (cm) | 2.25 x 1.5 x 1.5 |
Weight (g) | 8.67 |
Original Classification | H Chondrite (Impact Melt) |
Pairing | LAP 031173; LAP 031308; LAP 04642; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 19;Ferrosilite (mol%): 16 | |
Weathering | |
C | |
Fracturing | |
C | |
Macroscopic Description - Kathleen McBride | |
This H chondrite has a rough brown interior which crumbles easily. | |
Thin Section Description (,2) - Tim McCoy, Valerie Reynolds | |
The meteorite exhibits an area with microcrystalline silicate matrix including rounded metal-sulfide blebs reaching 20 microns, as well as relict grains, chondrules and clasts reaching up to a few mm that are highly-shocked with local metal-sulfide redistribution. Mafic silicate compositions (Fa19, Fs17) indicate H chondrite parentage and texture suggests it is an impact melt breccia. Pairing with the LAP 031173 group is possible. |
References for Sample LAP031308 | |
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. |