Sample Petrographic Description
Sample Number | BUC 10943 |
Newsletter | 34,2 |
Location | Buckley Island |
Field Number | 21415 |
Dimensions (cm) | 4.4 x 3.2 x 3.0 |
Weight (g) | 27.75 |
Original Classification | CO3 Chondrite |
Updated Classification | CM2 Chondrite |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 0-39 | |
Weathering | |
Be | |
Fracturing | |
A/B | |
Macroscopic Description - Cecilia Satterwhite | |
This carbonaceous chondrite has 40% of its exterior covered with fractured black fusion crust, frothy in some areas. Areas without fusion crust are gray to black with some brown weathered areas. Some evaporites and small light colored/weathered inclusions/chondrules are visible. The interior matrix is dark gray to black with abundant mm sized white to light gray inclusions. Matrix around the rim is weathered brown. | |
Thin Section Description (,2) - Cari Corrigan, Linda Welzenbach, Nicole Lunning | |
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. 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 Fa0-39. This is a CO3 chondrite (likely type 3.0-3.2). | |
Reclassification Notes (AMN 46,1) | |
Originally classified as a CO3, the sample has H, C, and N bulk and isotopic composition, as well as O isotopic composition and degree of aqueous alteration, that are consistent with CM2. Details are reported in Alexander et al. (2018) Geochim. Cosmochim. Acta 221, 406-420. |
Antarctic Meteorite Images for Sample BUC 10943 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample BUC 10943 | ||||
Thin Section Photo(s) : | ||||
References for Sample BUC10943 | |
Alexander, C.M.O'D., Wynn, J.G., and Bowden, R., 2022, Sulfur abundances and isotopic compositions in bulk carbonaceous chondrites and insoluble organic material: Clues to elemental and isotopic fractions of volatile chalcophiles, Meteoritics & Planetary Science, 57, 334-351, doi:10.1111/maps.13746. | |
Alexander, C. O. D., Greenwood, R. C., Bowden, R., Gibson, J. M., Howard, K. T., & Franchi, I. A. , 2018, A multi-technique search for the most primitive CO chondrites. Geochimica et Cosmochimica Acta, 221, 406-420, https://doi.org/10.1016/j.gca.2017.04.021. |