Sample Petrographic Description
Sample Number | MIL 05029 |
Newsletter | 29,2 |
Location | Miller Range |
Field Number | 18098 |
Dimensions (cm) | 5.5 x 4.4 x 4.0 |
Weight (g) | 132.68 |
Original Classification | L Chondrite (Impact Melt) |
Pairing | MIL 05029; MIL 05136; MIL 05155; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 25;Ferrosilite (mol%): 21 | |
Weathering | |
A/Be | |
Fracturing | |
A/B | |
Macroscopic Description - Kathleen McBride, Cecilia Satterwhite | |
The exterior of 05029 has tiny black patches of fusion crust, the rest is a mottled gray with green crystals visible; 05136 has no fusion crust. The interior is a yellowish gray matrix with abundant green inclusions. There are some rusty areas. | |
Thin Section Description (,2) - Tim McCoy | |
The sections are so similar that a single description suffices. The meteorites consist of large (up to 4 mm) orthopyroxene grains with interstitial feldspar with both of these phases poikilitcally enclosing 50-200 µm olivine grains. Minor metal and sulfide are present, with sulfide occasionally rimming metal. Silicates (olivine of Fa25, orthopyroxene of Fs21Wo4, plagioclase of An16Or3) are compositionally within the range of L chondrites. The meteorites are likely L ordinary chondrite impact melt rocks and similar in some respects to PAT 91501 (Mittlefehldt and Lindstrom, MAPS, 36, 439). |
References for Sample MIL05029 | |
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. | |
Bogard, D. D., 2011, K-Ar ages of meteorites: Clues to parent-body thermal histories. Chemie der Erde - Geochemistry, 71 Issue 3, Aug-11, 207-226, ISSN 0009-2819, http://dx.doi.org/10.1016/j.chemer.2011.03.001. | |
Weirich, J. R., Wittmann, A., Isachsen, C. E., Rumble, D., Swindle, T. D., Kring, D. A., 2010, The Ar-Ar age and petrology of Miller Range 05029: Evidence for a large impact in the very early solar system. Meteoritics & Planetary Science, 45, 1868-1888, http://dx.doi.org/10.1111/j.1945-5100.2010.01124.x. | |
RELAB, , Reflectance Experiment Lab , catalogue of samples. |