Sample Petrographic Description
Sample Number | DOM 08139 |
Newsletter | 34,2 |
Location | Dominion Range |
Field Number | 18288 |
Dimensions (cm) | 2.5 x 2.5 x 1.5 |
Weight (g) | 21.76 |
Original Classification | CO3 Chondrite |
Updated Classification | CO3.05 Chondrite |
Pairing | DOM 08004; DOM 03238; DOM 08139; DOM 08351; DOM 10101; DOM 10104; DOM 14019; DOM 14127; DOM 14305; DOM 18019; DOM 18069; DOM 19049; DOM 19068; DOM 19099; DOM 19170; DOM 19179; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 0-60 | |
Weathering | |
A/B | |
Fracturing | |
A | |
Macroscopic Description - Kathleen McBride, Cecilia Satterwhite | |
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. | |
Thin Section Description (,2) - Cari Corrigan, Linda Welzenbach, Nicole Lunning | |
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. | |
Reclassification Notes (AMN 47,1) | |
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. | |
Notes | |
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. Comparison of DOM 03238 to many of these samples reveals that it has the same CRE age, Type II chondrule olivine Cr2O3 contents, and H, C, and N elemental and isotopic compositions. Initially thought to have a high magnetite component, its mode is only slightly higher than that measured in a number of DOM 08004 pairing group CO3s (Rubin and Li, 2019). Given all this new information, we reclassify DOM 03238 as a CO3, and add it to the DOM 08004 pairing group. Data supporting this new pairing update for DOM CO3 chondrites were presented in Righter et al. (2021, 2022, 2023) and Rubin and Li (2019). |
Antarctic Meteorite Images for Sample DOM 08139 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample DOM 08139 | ||||
Thin Section Photo(s) : | ||||