Sample Petrographic Description
Sample Number | MIL 07675 |
Newsletter | 33,1 |
Location | Miller Range |
Field Number | 19858 |
Dimensions (cm) | 3.75 x 3.5 x 2.75 |
Weight (g) | 37.43 |
Original Classification | CM2 Chondrite |
Pairing | MIL 07497; MIL 07674; MIL 07675; MIL 07680; MIL 07682; MIL 07692; MIL 07701; MIL 07703; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 0-47;Ferrosilite (mol%): 5 | |
Weathering | |
Be | |
Fracturing | |
B | |
Macroscopic Description - Kathleen McBride, Roger Harrington | |
The exteriors of these meteorites have purplish black to black fusion crust with polygonal fractures. The interior matrixes range in color from gray to black, fine grained with white and light gray inclusions. Some have rusty areas and some have evaporites. | |
Thin Section Description (,2) - McCoy, Cari Corrigan, Linda Welzenbach, Karen Stockstill | |
The sections are so similar that a single description suffices. The sections consist of moderately abundant small chondrules (up to 0.5 mm), mineral grains, and CAIs set in a black matrix; rare metal and sulfide grains are present. Chondrules are very lightly altered. Olivine compositions are Fa0-55 pyroxene is Fs1-5. Aqueous alteration of the matrix is substantial, but the chondrules are only modestly altered. The meteorites are CM2 chondrites. |
Antarctic Meteorite Images for Sample MIL 07675 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample MIL 07675 | ||||
Thin Section Photo(s) : | ||||
References for Sample MIL07675 | |
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. | |
Velbel, M.A., and Zolensky, M.E., 2021, Thermal metamorphism of CM chondrites: A dehydroxylation-based peak temperature thermometer and implications for sample return from asteroids Ryugu and Bennu. Meteoritics & Planetary Science, 56, 546–585, doi: 10.1111/maps.13636. | |
Amsellem, E., Moynier, F., Mahan, B., and Beck, P., 2020, Timing of thermal metamorphism in CM chondrites: Implications for Ryugu and Bennu future sample return. Icarus, 339, 113593. | |
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. |