Sample Petrographic Description
Sample Number | MIL 090292 |
Newsletter | 35,2 |
Location | Miller Range |
Field Number | 20597 |
Dimensions (cm) | 2.5 x 2.0 x 1.5 |
Weight (g) | 8.94 |
Original Classification | CR1 Chondrite |
Updated Classification | C1 Chondrite Ungrouped |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 3;Ferrosilite (mol%): 2-39 | |
Weathering | |
B | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride | |
90% of the exterior has brown/black fusion crust with polygonal fractures. The interior matrix is black with an oxidation rind and some white inclusions. | |
Thin Section Description (,2) - Cari Corrigan, Tim McCoy, Glenn MacPherson | |
The section is comprised of large (1 mm) chondrules that are almost completely replaced by aqueous alteration products. Opaques include sulfides and metal (?) that have been extensively altered. Rare magnesian mafic silicates of Fa3, Fs2-39 are found mostly within chondrules. The meteorite appears to be a type 1 carbonaceous chondrite, likely a CR, although a relationship to CV chondrites is possible. | |
Reclassification Notes (AMN 42,1) | |
Jilly-Rehak, C. E., Huss, G. R., Nagashima, K., & Schrader, D. L., 2018, Low-temperature aqueous alteration on the CR chondrite parent body: Implications from in situ oxygen-isotope analyses., Geochimica et Cosmochimica Acta, 222, 230-252 ,https://doi.org/10.1016/j.gca.2017.10.007. Schrader, D. L., Davidson, J., Greenwood, R. C., Franchi, I. A., Gibson, J. M., 2014, A water-ice rich minor body from the early Solar System: The CR chondrite parent asteroid. , Earth and Planetary Science Letters, 407, 48-60. Harju, E. R., Rubin, A. E., Ahn, I., Choi, B.-G., Ziegler, K., Wasson, J. T., 2014, Progressive aqueous alteration of CR carbonaceous chondrites, Geochimica et Cosmochimica Acta, 139 , 15-Aug-14 , 267-292 , ISSN 0016-7037 ,http://dx.doi.org/10.1016/j.gca.2014.04.048. |
Antarctic Meteorite Images for Sample MIL 090292 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample MIL 090292 | ||||
Thin Section Photo(s) : | ||||
References for Sample MIL090292 | |
Zhu, K., Schiller, M., Moynier, F., Groen, M., Alexander, C.M.D., Davidson, J., Schrader, D.L., Bischoff, A., and Bizzarro, M., 2023, Chondrite diversity revealed by chromium, calcium and magnesium isotopes. Geochimica et Cosmochimica Acta, 342, 156–168, https://doi.org/10.1016/j.gca.2022.12.014. | |
Schrader, D.L., Davidson, J., McCoy, T.J., Zega, T.J., Russell, S.S., Domanik, K.J., and King, A.J., 2021, The Fe/S ratio of pyrrhotite group sulfides in chondrites: An indicator of oxidation and implications for return samples from asteroids Ryugu and Bennu. Geochimica et Cosmochimica Acta, 303, 66–91, https://doi.org/10.1016/j.gca.2021.03.019. | |
Russell, S.S., Suttle, M.D., and King, A.J., 2021, Abundance and importance of petrological type 1 chondritic material, Meteoritics & Planetary Science, 57:2, 1-25, doi: 10.1111/maps.13753. | |
Jilly-Rehak, C. E., Huss, G. R., Nagashima, K., & Schrader, D. L. , 2018, Low-temperature aqueous alteration on the CR chondrite parent body: Implications from in situ oxygen-isotope analyses. . Geochimica et Cosmochimica Acta, 222, 230-252, https://doi.org/10.1016/j.gca.2017.10.007. | |
Weisberg, M.K., and Righter, K., 2015, Primitive Asteroids: Expanding the Range of Known Primitive Materials. In Righter, K., Corrigan, C.M., McCoy, T.J., and Harvey, R.P. Meteorites: A Pictorial Guide to the Collection, First Edition, AGU Wiley, pp. 65-77. | |
Schrader, D. L., Davidson, J., Greenwood, R. C., Franchi, I. A., Gibson, J. M., 2014, A water-ice rich minor body from the early Solar System: The CR chondrite parent asteroid. Earth and Planetary Science Letters, 407, 48-60. | |
Harju, E. R., Rubin, A. E., Ahn, I., Choi, B.-G., Ziegler, K., Wasson, J. T., 2014, Progressive aqueous alteration of CR carbonaceous chondrites. Geochimica et Cosmochimica Acta, 139, 15-Aug-14, 267-292, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2014.04.048. |