Newsletter |
34,2 |
Location |
Dominion Range |
Field Number |
21888 |
Dimensions (cm) |
4.5 x 2.6 x 2.1 |
Weight (g) |
26.09 |
Original Classification |
CO3 Chondrite |
Updated Classification |
CO3.05 Chondrite |
Fayalite (mol%): 1-45 |
A/Be |
A/B |
Black fractured fusion crust with evaporites and some oxidation is visible to varying degrees on these paired carbonaceous chondrites. The interiors are dark gray to black in color with white inclusions/chondrules some stained with oxidation and rust. These meteorites contain some metal and are moderately weathered. |
These meteorites are so similar that a single description suffices. The sections consist of abundant small (up to 1 mm) chondrules, chondrule fragments and mineral grains in a dark matrix. Metal and sulfide occur within and rimming the chondrules. Glass within chondrules appears to be very clear/fresh. CAIs are abundant (mostly Type A), and range in size up to 1 mm. AOAs up to 1 mm are present, as well. Olivine ranges in composition from Fa0-66. These meteorites exhibit mild terrestrial alteration. These are CO3 chondrites (likely type 3.0-3.2), and are paired with the DOM 08004. |
Based on Type II (FeO-rich) chondrule olivine Cr content, this sample has been reclassified to CO3.05 chondrite. Details 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. |
Pairing group updated for AMN 44 no. 2 based on information in :
Righter K., Alexander, C., Foustoukos, D., Mertens, C.A.K., Busemann, H., Schutt, J. (2021b) Pairing Relations Within CO3 Chondrites Recovered at the Dominion Range and Miller Range, Transantarctic Mountains, 84th Annual Meteoritical Society meeting, Chicago, abstract #6191.
Originally classified as a CO3 and part of the DOM 08004 pairing group, the sample has H, C, and N bulk and isotopic, cosmic ray exposure age, magnetic susceptibility, and thermoluminescence properties that are distinct from the DOM 08004 and other DOM CO3 pairing groups. It is therefore unpaired from DOM 08004. Details are reported in Righter et al. (2023) LPSC, #2139. |