Newsletter |
42,2 |
Location |
Dominion Range |
Field Number |
25421 |
Dimensions (cm) |
5.0 x 4.9 x 2.5 |
Weight (g) |
43.26 |
Original Classification |
CM2 Chondrite |
Updated Classification |
CO3.05 Chondrite |
Fayalite (mol%): 1-58;Ferrosilite (mol%): 1-12 |
Be |
B |
The exterior is a black to dark gray color and is heavily fractured and pitted. Small inclusions/chondrules are visible on the exposed areas. It has a coarse grained texture and minor oxidation. No fusion crust is present. The interior is a dark gray to black fined grained matrix with some light/weathered inclusions/chondrules, oxidation and a thin band of evaporites is visible. |
The section consists of numerous small chondrules (up to 0.5 mm), mineral grains and CAIs set in a black matrix; rare metal and sulfide grains are present. Aqueous alteration of the matrix is substantial, but the chondrules are only minimally altered. Olivine compositions are Fa1-58, pyroxene is Fs1-12. The meteorite is a CM2 chondrite. |
Oxygen isotopes, Cr in Type II chondrule olivines, and hand specimen characteristics all suggest a possible pairing with DOM 10900 or DOM 18070, both of which are CO 3.05. DOM 18071 has Cr2O3 = 0.36 wt.% (sigma = 0.07) for 43 analyses on olivines from Type II FeO-rich chondrules in section DOM 08071 ,5. A pairing between these several samples could be the focus of a future effort, but they are currently not paired to be conservative. DOM 18071 is re-classified here from CM2 to CO3.05.
Details for DOM 10900 and DOM 18070 are reported in Righter, K. et al. (2024) Pairing relations within CO3 chondrites recovered at the Dominion Range and Miller Range, Transantarctic mountains: Constraints from chondrule olivines, noble gas, and H, C, N bulk and isotopic compositions. Meteoritics and Planetary Science 59; https://doi.org/10.1111/maps.14146. |