Antarctic Meteorite Petrographic Description

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Sample Petrographic Description

Sample Number

GRO 95574

Newsletter

21,1

Location

Grosvenor Mountains

Field Number

7624

Dimensions (cm)

5.5 x 3.5 x 3.0

Weight (g)

90.62

Original Classification

Howardite

Pairing

GRO 95534; GRO 95535; GRO 95574; GRO 95581;

Mineral Composition (%Fa & %Fs)

Ferrosilite (mol%): 22-37

Weathering

Fracturing

Macroscopic Description - Kathleen McBride

Ninety five percent of the exterior of this achondrite has smooth, black fusion crust, that appears shiny in some small patches. The interior is gray in color and resembles concrete. Almost no rust is present. There are light colored clasts approximately 1-2 mm in size and a few dark clasts < 1mm in size.

Thin Section Description (,2) - Brian Mason

The section shows a groundmass of comminuted pyroxene and plagioclase grains (up to 0.3 mm) with a few larger plagioclase clasts (up to 1 mm). Microprobe analyses show that most of the pyroxene is hypersthene (Wo_1-5, Fs_22-34); one grain of augite, Wo₃₆Fs₃₇, was analyzed, and several grains of intermediate composition. Plagioclase composition is An_91-96. The meteorite is a howardite, very similar in texture and mineral compositions to GRO95534, 95535, 95581, and 95602, with which it is probably paired.

Notes

GRO 95602 was initially paired with four other GRO howardites – GRO 95534, GRO 95535, GRO 95574, and GRO 95581. The relations between these five howardites have been re-evaluated by Mittlefehldt et al. (2013), Cartwright et al. (2014) and Lunning et al. (2016). Based on petrography, mineralogy, petrology, and bulk composition, GRO 95534, GRO 95535, GRO 95574, and GRO 95581 are paired together; GRO 95602 has been removed from this pairing group and is unpaired. AMN 45, no. 2.

Antarctic Meteorite Images for Sample GRO 95574

Lab Photo(s) :

Antarctic Meteorite Images for Sample GRO 95574

Thin Section Photo(s) :

Thin Section Photo of Sample GRO 95574 in Cross Polarized Light

Thin Section Photo of Sample GRO 95574 in Cross-Polarized Light with 2.5X Magnification

References for Sample GRO95574

Zolensky, M., Mikouchi, T., Hagiya, K., Ohsumi, K., Komatsu, M., Cheng, A., and Le, L., 2022, Evidence for impact shock and regolith transportation on CM, CI, and CV chondrite parent asteroids, Meteoritics & Planetary Science, 57:10, 1902-1919, doi: 10.1111/maps.13909.

Hahn, T. M., Lunning, N. G., McSween, H. Y., Bodnar, R. J., and Taylor, L. A., 2018, Mg-rich harzburgites from Vesta: Mantle residua or cumulates from planetary differentiation. Meteoritics & Planetary Science, 53, 514-546, doi: 10.111/maps.13036.

Rubin, A. E., & Ma, C. , 2017, Meteoritic minerals and their origins. . Chemie der Erde-Geochemistry, 77, 325-385, http://dx.doi.org/10.1016/j.chemer.2017.01.005.

Moriarty, D. P., Pieters, C. M., 2016, Complexities in pyroxene compositions derived from absorption band centers: Examples from Apollo samples, HED meteorites, synthetic pure pyroxenes, and remote sensing data. Meteoritics & Planetary Science, 51(2), 207-234.

Lunning, N. G., Welten, K. C., McSween, H. Y., Caffee, M. W., Beck, A. W., 2016, Grosvenor Mountains 95 howardite pairing group: Insights into the surface regolith of asteroid 4 Vesta. Meteoritics & Planetary Science, 51(1), 167-194.

Lunning N.G., Corrigan C.M., McSween H.Y., Tenner T.J., Kita N.T., Bodnar Jr., R. J., 2016, CV and CM Chondrite Impact Melts. Geochimica et Cosmochimica Acta, 189, 338-358.

Mittlefehldt, D. W., 2015, Asteroid (4) Vesta: I. The howardite-eucrite-diogenite (HED) clan of meteorites. Chemie der Erde - Geochemistry, 75 Issue 2, Jun-15, 155-183, ISSN 0009-2819, http://dx.doi.org/10.1016/j.chemer.2014.08.002.

Lunning, N. G., Mcsween Jr., H. Y., Tenner, T. J., Kita, N. T., Bodnar, R. J., 2015, Olivine and pyroxene from the mantle of asteroid 4 Vesta. Earth and Planetary Science Letters, 418, 15-May-15, 126-135, ISSN 0012-821X, http://dx.doi.org/10.1016/j.epsl.2015.02.043.

Le Corre, L., Reddy, V., Sanchez, J. A., Dunn, T., Cloutis, E. A, Izawa, M. R. M, Mann, P., Nathues, A., 2015, Exploring exogenic sources for the olivine on Asteroid (4) Vesta. Icarus, 258, 483-499.

Mittlefehldt, D. W., Herrin, J. S., Quinn, J. E., Mertzman, S. A., Cartwright, J. A., Mertzman, K. R., Peng, Z. X., 2013, Composition and petrology of HED polymict breccias: The regolith of (4) Vesta. Meteoritics & Planetary Science, 48, 2105-2134, http://dx.doi.org/10.1111/maps.12182.

Cohen, B. A., 2013, The Vestan cataclysm: Impact-melt clasts in howardites and the bombardment history of 4 Vesta. Meteoritics & Planetary Science, 48, 771-785, http://dx.doi.org/10.1111/maps.12101.

Warren, P. H., Kallemeyn, G. W., Huber, H., Ulff-MÃ¸ller, F., Choe, W., 2009, Siderophile and other geochemical constraints on mixing relationships among HED-meteoritic breccias. Geochimica et Cosmochimica Acta, 73 Issue 19, 1-Oct-09, 5918-5943, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2009.06.030.

RELAB, , Reflectance Experiment Lab , catalogue of samples.

Antarctic Meteorite Petrographic Description

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