Antarctic Meteorite Petrographic Description

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Sample Petrographic Description

Sample Number

GRA 95205

Newsletter

20,1

Location

Graves Nunataks

Field Number

7616

Dimensions

10.5 x 7.5 x 7.5

Weight

1459.80

Original Classification

Ureilite

Mineral Composition (%Fa & %Fs)

Fayalite (mol%): 20-22;Ferrosilite (mol%): 18-20

Weathering

Fracturing

Macroscopic Description - Kathleen McBride

The exterior of this achondrite has patches of dull black fusion crust with polygonal fractures. Most of the fusion crust has weathered away. The resulting surface is a rusty green-brown color with numerous areas or patches of shiny melted-appearing minerals. Several fractures are visible. This meteorite is very hard and extremely difficult to break. The interior revealed white to yellow minerals; pyroxene and plagioclase and oxides are present. Some areas are completely rusty. Cleavage planes were visible on some of the larger mineral grains. This achondrite has an igneous texture.

Thin Section Description (,5) - Brian Mason

The section shows an aggregate of anhedral to subhedral grains, up to 6 mm across, of olivine and pyroxene. Individual grains are rimmed by carbonaceous material which contains trace amounts of nickel-iron and troilite. The olivine crystals have been converted into a mosaic of tiny grains, presumably by shock; the pyroxene crystals appear to be unaffected, and show polysynthetic twinning. Mineral compositions are slightly variable; mean values are olivine, Fa₂₁; pyroxene, Wo₄Fs₁₉. The meteorite is a ureilite.

Antarctic Meteorite Images for Sample GRA 95205

Lab Photo(s) :

Lab Photo of Sample GRA 95205 Showing Top East View

Lab Photo of Sample GRA 95205 Showing Top North View

Lab Photo of Sample GRA 95205 Showing Top South View

Lab Photo of Sample GRA 95205 Showing Top West View

Lab Photo of Sample GRA 95205 Showing West Bottom View

Antarctic Meteorite Images for Sample GRA 95205

Thin Section Photo(s) :

Thin Section Photograph of Sample GRA 95205 in Cross-Polarized Light

Thin Section Photograph of Sample GRA 95205 in Plane-Polarized Light

References for Sample GRA95205

Budde, G., Burkhardt, C., and Kleine,T., 2020, Molybdenum isotopic evidence for the late accretion of outer Solar System material to Earth. , Nature Astronomy, 3 , 736–741 .

Kaplan, H.H., Connolly, H.C., Dotto, E., Emery, J.P., Fornasier, S., Lantz, C., Lim, L.F., Merlin, F., Praet, A., Reuter, D.C., Sanford, S.A., Hamilton, V.E., Simon, A.A., Takir, D., and Lauretta, D.S., Howell, E.S., Anderson, F.S., Barrucci, M.A., Brucato, J., Burbine, T.H., Clark, B.E., Cloutis, E.A., 2020, Visible-near infrared spectral indices for mapping mineralogy and chemistry with OSIRIS-Rex. , Meteoritics & Planetary Science, 55 , 744-765 , doi: 10.111/maps.13461.

Schiller, M., Bizzarro, M., Siebert, J., 2020, Iron isotope evidence for very rapid accretion and differentiation of the proto-Earth. , Science Advances, 6 , eaay 7604 , doi: 10.1126/sciadv.aay7604.

Brugier, Y. A., Barrat, J. A., Gueguen, B., Agranier, A., Yamaguchi, A., & Bischoff, A., 2019, Zinc isotopic variations in ureilites. , Geochimica et Cosmochimica Acta, 246 , 450-460 .

Simkus, D. N., Aponte, J. C., Elsila, J. E., Parker, E. T., Glavin, D. P., & Dworkin, J. P., 2019, Methodologies for Analyzing Soluble Organic Compounds in Extraterrestrial Samples: Amino Acids, Amines, Monocarboxylic Acids, Aldehydes, and Ketones. , Life, 9 , 47 .

Barrat, J. A., Jambon, A., Yamaguchi, A., Bischoff, A.,, Rouget, M. L., Liorzou, C., 2016, Partial melting of a C-rich asteroid: Lithophile trace elements in ureilites. , Geochimica et Cosmochimica Acta, 194 , 163-178 .

Goderis, S., Brandon, A. D., Mayer, B., Humayun, M., 2015, s-Process Os isotope enrichment in ureilites by planetary processing. , Earth and Planetary Science Letters, 431 , 1-Dec-15 , 110-118 , ISSN 0012-821X , http://dx.doi.org/10.1016/j.epsl.2015.09.021 .

Budde, G., Kruijer, T. S, Fischer-Godde, M., Irving, A. J., Kleine, T., 2015, Planetesimal differentiation revealed by the Hf-W systematics of ureilites. , Earth and Planetary Science Letters, 430 , 15-Nov-15 , 316-325 , ISSN 0012-821X , http://dx.doi.org/10.1016/j.epsl.2015.08.034 .

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 .

Goodrich, C. A., Ash, R. D., Van Orman, J. A., Domanik, K., McDonough, W. F., 2013, Metallic phases and siderophile elements in main group ureilites: Implications for ureilite petrogenesis. , Geochimica et Cosmochimica Acta, 112 , 1-Jul-13 , 340-373 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2012.06.022 .

Burton, A. S., Elsila, J. E., Callahan, M. P., Martin, M. G., Glavin, D. P., Johnson, N. M., Dworkin, J. P., 2012, A propensity for n-ω-amino acids in thermally altered Antarctic meteorites. , Meteoritics & Planetary Science, 47 , 374-386 , http://dx.doi.org/10.1111/j.1945-5100.2012.01341.x .

Cloutis, E. A., Hudon, P., Romanek, C. S., Bishop, J. L., Reddy, V., Gaffey, M. J., Hardersen, P. S., 2010, Spectral reflectance properties of ureilites. , Meteoritics & Planetary Science, 45 , 1668-1694 , http://dx.doi.org/10.1111/j.1945-5100.2010.01065.x .

Rochette, P., Gattacceca, J., Bourot-Denise, M., Consolmagno, G., Folco, L., Kohout, T., Pesonen, L., Sagnotti, L., 2009, Magnetic classification of stony meteorites: 3. Achondrites. , Meteoritics & Planetary Science, 44 , 405-427 , http://dx.doi.org/10.1111/j.1945-5100.2009.tb00741.x .

Lee, D., Halliday, A. N., Singletary, S. J., Grove, T. L., 2009, 182Hf-182W chronometry and early differentiation of the ureilite parent body. , Earth and Planetary Science Letters, 288 Issues 3-4 , 15-Nov-09 , 611-618 , ISSN 0012-821X , http://dx.doi.org/10.1016/j.epsl.2009.10.025 .

Rankenburg, K., Humayun, M., Brandon, A. D., Herrin, J. S., 2008, Highly siderophile elements in ureilites. , Geochimica et Cosmochimica Acta, 72 Issue 18 , 15-Sep-08 , 4642-4659 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2008.07.003 .

Rankenburg, K., Brandon, A. D., Humayun, M., 2007, Osmium isotope systematics of ureilites. , Geochimica et Cosmochimica Acta, 71 Issue 9 , 1-May-07 , 2402-2413 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2007.02.015 .

Rubin, A. E., 2006, Shock, post-shock annealing, and post-annealing shock in ureilites. , Meteoritics & Planetary Science, 41 , 125-133 , http://dx.doi.org/10.1111/j.1945-5100.2006.tb00197.x .

Warren, P. H., Ulff-MÃ¸ller, F., Huber, H., Kallemeyn, G. W., 2006, Siderophile geochemistry of ureilites: A record of early stages of planetesimal core formation. , Geochimica et Cosmochimica Acta, 70 Issue 8 , 15-Apr-06 , 2104-2126 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2005.12.026 .

Farquhar, J., Jackson, T. L., Thiemens, M. H., 2000, A 33S enrichment in ureilite meteorites: evidence for a nebular sulfur component. , Geochimica et Cosmochimica Acta, 64 Issue 10 , May-00 , 1819-1825 , ISSN 0016-7037 , http://dx.doi.org/10.1016/S0016-7037(00)00356-2 .

RELAB, , Reflectance Experiment Lab , catalogue of samples, .

Antarctic Meteorite Petrographic Description

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