Newsletter |
43,1 |
Location |
Dominion Range |
Field Number |
24835 |
Dimensions (cm) |
5.0 x 3.7 x 2.5 |
Weight (g) |
63.45 |
Original Classification |
CO3 Chondrite |
Updated Classification |
CO3.05 Chondrite |
Fayalite (mol%): 3 |
A |
A/B |
Fusion crust is dark brown with cracks. Exposed interior is dark brown to black with light colored spots less than 1 mm and brown spots less than 2 mm. The interior is black with light colored spots less than 1 mm. |
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. Olivine ranges in composition from Fa1-45. Three pyroxene analyses range from Fs1-7. The meteorites are CO3 chondrites. |
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. |
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. It has a lower CRE age (~ 7 Ma) similar to DOM 14359 (~5 Ma), but still different and outside of error on the age. Details are reported in Righter et al. (2023) LPSC, #2139. |