Antarctic Meteorite Petrographic Description

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Sample Petrographic Description

Sample Number

EET 96286

Newsletter

21,2

Location

Elephant Moraine

Field Number

10609

Dimensions (cm)

3.0 x 2.0 x 1.5

Weight (g)

12.88

Original Classification

CV3 Chondrite

Updated Classification

CR2 Chondrite

Mineral Composition (%Fa & %Fs)

Fayalite (mol%): 1-2;Ferrosilite (mol%): 1-4

Weathering

B/C

Fracturing

Macroscopic Description - Carol Schwarz

The exterior of this carbonaceous chondrite has 95% brown/black polished fusion crust. The interior has a black matrix with mm sized white and rusty inclusions. The meteorite is very fractured.

Thin Section Description (,2) - Tim McCoy

The section exhibits large chondrules (up to 3.5 mm), CAIs and metal in a dark matrix. Some clasts appear to have been aqueously altered. Olivines range from Fa_1-2 and pyroxenes from Fs_1-4. The meteorite is an unequilibrated carbonaceous chondrite, probably a CV3.

Reclassification Notes (AMN 33,1)

Original classification in AMN 21, no. 2 as a CV3 chondrite, but several studies have brought information to light that is inconsistent with that classification. Raman data, as well as isotopic data for C, H, and O indicate this meteorite is not a CV3, but a CR2 chondrite ([1] Busemann et al., 2007; [2] Makide et al., 2009).

References:

[1] Busemann, H. et al., (2007) Characterization of insoluble organic matter in primitive meteorites by microRaman spectroscopy. Meteoritics & Planetary Science 42, 1387–1416.
[2] Makide, K. et al., (2009) Oxygen- and magnesium-isotope compositions of calcium–aluminum-rich inclusions from CR2 carbonaceous chondrites. Geochimica et Cosmochimica Acta 73, 5018–5050.

Antarctic Meteorite Images for Sample EET 96286

Lab Photo(s) :

Antarctic Meteorite Images for Sample EET 96286

Thin Section Photo(s) :

Thin Section Photo of Sample EET 96286 in Cross-Polarized Light with 2.5X Magnification

Thin Section Photo of Sample EET 96286 in Cross-Polarized Light with Magnification

Thin Section Photo of Sample EET 96286 in Plane-Polarized Light with Magnification

Thin Section Photo of Sample EET 96286 in Reflected Light with Magnification

References for Sample EET96286

Abreu, N.M., Aponte, J.C., Cloutis, E.A. , and Nguyen, A.N., 2020, The Renazzo-like carbonaceous chondrites as resources to understand the origin, evolution, and exploration of the solar system. , Geochemistry, 80 , 125631 .

Alexander, C. M. O'D., Bowden, R., Fogel, M. L., Howard, K. T., 2015, Carbonate abundances and isotopic compositions in chondrites. , Meteoritics & Planetary Science, 50 , 810-833 , http://dx.doi.org/10.1111/maps.12410 .

Alexander, C.O'D. M. O, Bowden,. R., Fogel, M. L., Howard, K. T., Herd, C. D. K., Nittler, L. R., 2012, The provenances of asteroids, and their contributions to the volatile inventories of the terrestrial planets. , Science, 337(6095) , 2012 , 721-723 .

Makide, K., Nagashima, K., Krot, A. N., Huss, G. R., Hutcheon, I. D., Bischoff, A., 2009, Oxygen- and magnesium-isotope compositions of calcium-aluminum-rich inclusions from CR2 carbonaceous chondrites. , Geochimica et Cosmochimica Acta, 73 Issue 17 , 1-Sep-09 , 5018-5050 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2009.01.042 .

Rochette, P., Kohout, T., Pesonen, L., Quirico, E., Sagnotti, L., Skripnik, A., Gattacceca, J., Bonal, L., Bourot-Denise, M., Chevrier, V., Clerc, J. P., Consolmagno, G., Folco, L., Gounelle, M., 2008, Magnetic classification of stony meteorites: 2. Non-ordinary chondrites. , Meteoritics & Planetary Science, 43 , 959-980 , http://dx.doi.org/10.1111/j.1945-5100.2008.tb01092.x .

Busemann, H., Alexander, C. M. O'D., Nittler, L. R., 2007, Characterization of insoluble organic matter in primitive meteorites by microRaman spectroscopy. , Meteoritics & Planetary Science, 42 , 1387-1416 , http://dx.doi.org/10.1111/j.1945-5100.2007.tb00581.x .

Krot, A. N., Libourel, G., Goodrich, C. A., Petaev, M. I., 2004, Silica-rich igneous rims around magnesian chondrules in CR carbonaceous chondrites: Evidence for condensation origin from fractionated nebular gas. , Meteoritics & Planetary Science, 39 , 1931-1955 .

Antarctic Meteorite Petrographic Description

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