Sample Petrographic Description
Sample Number | DOM 10085 |
Newsletter | 37,1 |
Location | Dominion Range |
Field Number | 17216 |
Dimensions (cm) | 3.0 x 2.0 x 1.5 |
Weight (g) | 18.15 |
Original Classification | CR2 Chondrite |
Updated Classification | CV3 Chondrite (Reduced) |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 0-4;Ferrosilite (mol%): 0.7-1.65 | |
Weathering | |
C | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
The exterior of this CR2 has a patch of black fusion crust covering <10% of the surface. The interior is rusty black with no visible features. | |
Thin Section Description (,2) - Linda Welzenbach, Pamela Salyer, Tim McCoy | |
The section exhibits a distinct lineation with a few small (100-300 microns) metal-rich chondrules and a few CAIs in a dark matrix of FeO-rich phyllosilicate. Polysynthetically twinned pyroxene is abundant. Small metal grains show “fizzed” texture and some silicates show mosaicism indicating moderate to strong shock. Silicates are unequilibrated; olivines range from Fa0-5, with most Fa1 and pyroxenes from Fs0-1Wo0-2. The meteorite is probably a CR2 chondrite. | |
Reclassification Notes (AMN 46,2) | |
Prestgard et al. (2023) report new oxygen isotope data for CR chondrites, and found three US Antarctic meteorites that are inconsistent with CR2 classification. DOM 10085 was classified in AMN 37 no. 1 as a CR2 is reclassified as a CV reduced. |
Antarctic Meteorite Images for Sample DOM 10085 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample DOM 10085 | ||||
Thin Section Photo(s) : | ||||
References for Sample DOM10085 | |
Prestgard, T., Beck, P., Bonal, L., Eschrig, J., Gattacceca, J., Sonzogni, C., and Krämer Ruggiu, L., 2023, The parent bodies of CR chondrites and their secondary history, Meteoritics & Planetary Science, 58, 1117-1148, doi: 10.1111/maps.14048. | |
Takir, D., Stockstill-Cahill, K. R., Hibbitts, C. A., & Nakauchi, Y. , 2019, 3-µm reflectance spectroscopy of carbonaceous chondrites under asteroid-like conditions. Icarus, 333, 243-251. |