Sample Petrographic Description
Sample Number | CMS 04049 |
Newsletter | 28,2 |
Location | Cumulus Hills |
Field Number | 14086 |
Dimensions (cm) | 6.0 x 2.5 x 3.5 |
Weight (g) | 90.21 |
Original Classification | Eucrite (Unbrecciated) |
Mineral Composition (%Fa & %Fs) | |
Ferrosilite (mol%): 28-59 | |
Weathering | |
B | |
Fracturing | |
A/B | |
Macroscopic Description - Kathleen McBride | |
40% of the exterior is covered with black fusion crust with shiny patches. The interior consists of black and white mineral grains with some gray globs and translucent, tabular shaped minerals. | |
Thin Section Description (,4) - Tim McCoy | |
The section shows an unbrecciated intergrowth of coarse (up to 1 mm) pyroxene and plagioclase grains with a gabbroic texture. Pyroxene is exsolved to orthopyroxene (Fs50Wo5) and augite (Fs28Wo41) (Fe/Mn ~30) and plagioclase is An79-91Or0-1. Shock effects are extensive including darkening of silicates. The meteorite is an unbrecciated eucrite. |
Antarctic Meteorite Images for Sample CMS 04049 | ||||
Lab Photo(s) : | ||||
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References for Sample CMS04049 | |
Dhaliwal, J.K., Day, J.M., and Tait, K.T., 2023, Pristinity and petrogenesis of eucrite, Meteoritics & Planetary Science, 58, 275-295, doi: 10.1111/maps.13945. | |
Mittlefehldt, D.W., Greenwood, R.C., Berger, E.L., Le, L., Peng, Z.X., and Ross, D.K., 2022, Eucrite-type achondrites: Petrology and oxygen isotope compositions, Meteoritics & Planetary Science, 57, 484-526, doi:10.1111/maps.13730. | |
Kumler, B., Day, J.M.D., 2021, Trace element variations generated by magmatic and post-crystallization processes in eucrite meteorites. Geochimica et Cosmochimica Acta, 301, 211–229, https://doi.org/10.1016/j.gca.2021.03.002. | |
McCubbin, F.M., Lewis, J.A., Barnes, J.J., Elardo, S.M., and Boyce, J.W., 2021, The abundances of F, Cl, and H2O in eucrites: Implications for the origin of volatile depletion in the asteroid 4 Vesta. Geochimica et Cosmochimica Acta, 314, 270–293, https://doi.org/10.1016/j.gca.2021.08.021. | |
Wu, N., Farquhar, J., Dottin, J. W. , Magalhães, N., 2018, Sulfur isotope signatures of eucrites and diogenites,. Geochimica et Cosmochimica Acta, 233, 1-13, https://doi.org/10.1016/j.gca.2018.05.002. |