Newsletter |
42,2 |
Location |
Dominion Range |
Field Number |
24995 |
Dimensions (cm) |
2.9 x 2.5 x 1.5 |
Weight (g) |
20.33 |
Original Classification |
CO3 Chondrite |
Updated Classification |
CO3.2 Chondrite |
Fayalite (mol%): 1-52;Ferrosilite (mol%): 1 |
A/B |
B |
60% of exterior is covered with a very dark brown, rough, fractured fusion crust that has a few faint orange rust spots. Remaining exterior is covered with a varnish that is also very dark brown with light gray spots that are <1 mm. Fresh interior is dark gray-brown in the center with small light brown inclusions and has a rim of lighter gray matrix near exterior edges. |
The section consists 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 Fa1-52. Two pyroxene analyses are Fs1. The meteorite is a CO3 chondrite. |
Based on Type II (FeO-rich) chondrule olivine Cr content, this sample has been reclassified to CO3.2 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 (~82 Ma), 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. |