Sample Petrographic Description
Sample Number | GRO 17051 |
Newsletter | 41,2 |
Location | Grosvenor Mountains |
Field Number | 25594 |
Dimensions (cm) | 19.0 x 8.0 x 5.0 |
Weight (g) | 2805.95 |
Original Classification | Iron-IAB |
Weathering | |
A/B | |
Fracturing | |
A | |
Macroscopic Description - Cari Corrigan, Nicole Lunning, Tim McCoy | |
This roughly rectangular mass measures ~20 x 8 x 6 cm. One side is flattened with shallow indentations, likely regmaglypts, and exhibits both weathering (including an overall brownish stain and rust haloes) and whitish regions suggestive of evaporites. The other side exhibits deep indentation with evaporite deposits in the lowest portion of those indentations, suggestive of extensive weathering and possible ablation of less resistant phases. | |
Thin Section Description (,2) - Cari Corrigan, Nicole Lunning, Tim McCoy | |
This section exhibits a coarse Widmanstätten pattern with kamacite lamellae of ~1 mm in width. Kamacite exhibits subgrain boundaries and alpha 2 structure and some grains exhibit a distinct darkening and cross-hatching suggestive of Neumann bands. Taenite ranges from thin ribbons to coarser areas with well-developed plessitic structure. Brecciated and weathered inclusions of troilite and daubrelite are present. Taken together these features are suggestive of extensive shock. Compositionally, this iron has 7.3 wt.% Ni, and 0.08 wt.% P, determined from microprobe transects. Classification is uncertain, but the meteorite may be a IAB iron. |
Antarctic Meteorite Images for Sample GRO 17051 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample GRO 17051 | ||||
Thin Section Photo(s) : | ||||
References for Sample GRO17051 | |
Chabot, N.L., and Zhang B., 2022, A revised trapped melt model for iron meteorites applied to the IIIAB group, Meteoritics & Planetary Science, 57, 200-227, doi: 10.111/maps.13740. |