Sample Petrographic Description
Sample Number | LAP 031125 |
Newsletter | 29,2 |
Location | LaPaz Ice Field |
Field Number | 16364 |
Dimensions (cm) | 2.0 x 1.5 x 1.25 |
Weight (g) | 7.04 |
Original Classification | H Chondrite (Impact Melt) |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 17;Ferrosilite (mol%): 16 | |
Weathering | |
B | |
Fracturing | |
A | |
Macroscopic Description - Kathleen McBride | |
The exterior of this meteorite is a dull brown color with no fusion crust. The interior of this ordinary chondrite is black, friable and has some rust. | |
Thin Section Description (,2) - Valerie Reynolds, Tim McCoy | |
The meteorite exhibits a relatively coarse (50-100 micron grain size), equigranular silicate matrix including rounded to irregular, metal-sulfide blebs reaching 0.5 mm and vesicles reaching 0.5 mm. Mafic silicate compositions (Fa17, Fs16) indicate H chondrite parentage and texture suggests it is an impact melt. |
References for Sample LAP031125 | |
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. |