Sample Petrographic Description
Sample Number | LAR 06299 |
Newsletter | 31,2 |
Location | Larkman Nunatak |
Field Number | 19691 |
Dimensions (cm) | 9.0 x 7.0 x 6.0 |
Weight (g) | 751.92 |
Original Classification | LL Chondrite (Impt Melt) |
Pairing | LAR 06298; LAR 06299; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 29;Ferrosilite (mol%): 23 | |
Weathering | |
B | |
Fracturing | |
A/B | |
Macroscopic Description - Kathleen McBride | |
The exteriors of these meteorites are rough, blackish in color with a few oxidation halos. There are some smooth areas that are lighter or more grayish in color than the rougher areas. Very small patches of rough, black fusion crust are present. The interiors are dark gray matrix with vesicles. | |
Thin Section Description (,2) - Tim McCoy, Linda Welzenbach | |
The sections are so similar that a single description suffices. They consist of a matrix of individual mineral fragments up to 100 microns in a melt-textured matrix with rounded to ellipsoidal metal-sulfide blebs. LAR 06298 also exhibits larger (up to several mm) unmelted chondritic fragments with rare relict barred olivine chondrules. Olivine is Fa29, pyroxene is Fs23. The meteorites are LL chondrite impact melt breccias. |
Antarctic Meteorite Images for Sample LAR 06299 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample LAR 06299 | ||||
Thin Section Photo(s) : | ||||
References for Sample LAR06299 | |
Rubin, A. E., & Ma, C. , 2017, Meteoritic minerals and their origins. . Chemie der Erde-Geochemistry, 77, 325-385, http://dx.doi.org/10.1016/j.chemer.2017.01.005. | |
McCoy, T.J., 2015, Meteorite Misfits: Fuzzy Clues to Solar System Processes. In Righter, K., Corrigan, C.M., McCoy, T.J., and Harvey, R.P. Meteorites: A Pictorial Guide to the Collection, First Edition, AGU Wiley, pp. 145-152. | |
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. | |
Rubin, A. E., Moore, W. B., 2011, What's up? Preservation of gravitational direction in the Larkman Nunatak 06299 LL impact melt breccia. Meteoritics & Planetary Science, 46, 737-747, http://dx.doi.org/10.1111/j.1945-5100.2011.01187.x. | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |