Sample Petrographic Description
Sample Number | PCA 02011 |
Newsletter | 27,1 |
Location | Pecora Escarpment |
Field Number | 13616 |
Dimensions (cm) | 2.5 x 1.25 x 0.5 |
Weight (g) | 2.61 |
Original Classification | CM2 Chondrite |
Pairing | PCA 02011; PCA 02010; PCA 02012; PCA 02050; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 1-43;Ferrosilite (mol%): 0-2 | |
Weathering | |
A/B | |
Fracturing | |
A/B | |
Macroscopic Description - Kathleen McBride | |
5-10% of the exteriors have a purplish black fusion crust with rough areas and a slight sheen. The interiors reveal a black charcoal-like, platy matrix, with tiny white and tan inclusions. | |
Thin Section Description (,2) - Linda Welzenbach, Tim McCoy | |
The sections consist of a few small chondrules (up to 1 mm), mineral grains and CAIs set in a black matrix; rare metal and sulfide grains are present. Olivine compositions are Fa0-43, with a peak at Fa0-2, orthopyroxene is Fs0-5. The matrix consists dominantly of an Fe-rich serpentine; chondrules are relatively unaltered. The meteorites are CM2 chondrites and probably paired. | |
Notes | |
PCA 02010 and PCA 02012 (the latter paired with PCA 02011 and PCA 02050) were initially announced as CM2 chondrites in two different AMN vol. 26, no. 2 and vol. 27, no. 1, but not considered together. Studies since then have revealed that they have the same CRE age (1.2 Ma), similar petrography (Zolensky et al., 2021), and are very closely associated. Given this data we can confidently add PCA 02010 to the PCA 02011 pairing group. |
Antarctic Meteorite Images for Sample PCA 02011 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample PCA 02011 | ||||
Thin Section Photo(s) : | ||||
References for Sample PCA02011 | |
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. |