Sample Petrographic Description
| Sample Number | GRA 06128 |
| Newsletter | 30,2 |
| Location | Graves Nunataks |
| Field Number | 17918 |
| Dimensions (cm) | 8.5 x 4.0 x 7.5 |
| Weight (g) | 447.60 |
| Original Classification | Achon. Ungrouped |
| Pairing | GRA 06128; GRA 06129; |
| Weathering | |
| Ce | |
| Fracturing | |
| C | |
| Macroscopic Description - Kathleen McBride | |
| 50% of the exteriors has shiny to glassy patches of black fusion crust. The exposed interior is rusty yellow in color and has fractures in a sort of plate-like orientation. The interior has small areas of gray crystalline material. It is a rusty to yellow-ocher color and very weathered. | |
| Thin Section Description - Tim McCoy, Linda Welzenbach, Glenn MacPherson, Lauren LaCroix | |
| The sections exhibit a granoblastic texture dominated by sodic plagioclase (>70 vol. % in the section studied) with lesser olivine and two pyroxenes, although mafic-rich pockets reaching several mm in size are present. Grain size is very heterogeneous; in one large feldspathic region the crystals are up to 5 mm, but elsewhere are rarely as large as 1 mm, perhaps suggesting formation as a breccia. Minor opaques include ilmenite (1.6% MgO), troilite, Fe,Ni-sulfide (pentlandite; 26% Ni), spinel (13% TiO2, 35% Cr2O3, 3% Al2O3), and Ni-Fe metal (67% Ni) that occurs only as minute inclusions inside of olivine. Silicates are equilibrated with olivine of Fa59, orthopyroxene of Fs44Wo2 (Fe/Mn~43), clinopyroxene of Fs19Wo43 (Fe/Mn~30-45) and oligoclase (An14Or2). The combination of its variable grain size, locally granoblastic texture, iron-rich mafics and sodium-rich plagioclase is unlike any known achondrite, including those of planetary origin. | |
| Oxygen Isotopic Composition - Z. Sharp, University of New Mexico | |
| Oxygen isotopic analyses of three small (2-5 mg) pieces of GRA 06129 yielded the following results which fall in the Earth, Moon and enstatite meteorite field: δ17O = 3.04, δ18O = 6.01, Δ 17O = -0.09 δ17O = 2.89, δ18O = 5.63, Δ 17O = -0.03 δ17O = 3.05, δ18O = 6.01, Δ 17O = -0.07 [where Δ 17O = δ17O – 0.52 x δ18O] |
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| Antarctic Meteorite Images for Sample GRA 06128 | ||||
| Field Photo(s) : | ||||
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| Field photo image(s) courtesy of the ANSMET (ANtarctic Search for METeorites) Program, Case Western Reserve University and the University of Utah | ||||
| Antarctic Meteorite Images for Sample GRA 06128 | ||||
| Lab Photo(s) : | ||||
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| References for Sample GRA06128 | |
| Greenwood, R.C., Burbine, T.H., and Franchi, I.A., 2020, Linking Asteroids and meteorites to the primordial planetesimal population. , Geochimica et Cosmochimica Acta, 277 , 377-406 , doi: 10.1016/j.gca.2020.02.004. | |
| Lunning, N. G., Bischoff, A., Gross, J., Patzek, M., Corrigan, C. M., and McCoy, T. J., 2020, Insights into the formation of silica-rich achondrites from impact melts in Rumuruti-type chondrites. , Meteoritics & Planetary Science, 55 , 130-148 , doi: 10.1111/maps.13430. | |
| Day, J. M., Corder, C. A., Assayag, N., & Cartigny, P., 2019, Ferrous oxide-rich asteroid achondrites. , Geochimica et Cosmochimica Acta, 266 , 544-567 , https://doi.org/10.1016/j.gca.2019.04.005 . | |
| Tartèse, R., Anand, M., & Franchi, I. A., 2019, H and Cl isotope characteristics of indigenous and late hydrothermal fluids on the differentiated asteroidal parent body of Grave Nunataks 06128. , Geochimica et Cosmochimica Acta, 266 , 529-543 , https://doi.org/10.1016/j.gca.2019.01.024 . | |
| Greenwood, R. C., Burbine, T. H., Miller, M. F., & Franchi, I. A. , 2017, Melting and differentiation of early-formed asteroids: The perspective from high precision oxygen isotope studies. . , Chemie Der Erde-Geochemistry, 77 , 1-43 , http://dx.doi.org/10.1016/j.chemer.2016.09.005 . | |
| Lunning, N. G., Gardner-Vandy, K. G., Sosa, E. S., McCoy, T. J., Bullock, E. S., & Corrigan, C. M. , 2017, Partial melting of oxidized planetesimals: An experimental study to test the formation of oligoclase-rich achondrites Graves Nunataks 06128 and 06129. . , Geochimica et Cosmochimica Acta, 214 , 73-85 , https://doi.org/10.1016/j.gca.2017.07.004 . | |
| Righter, K., Sutton, S.R., Danielson, L., Pando, K., Newville, M., 2016, Redox variations in the inner solar system with new constraints from vanadium XANES in spinels. , American Mineralogist, 101 , 1928-1944 . | |
| Usui, T., Jones, J. H., Mittlefehldt, D. W., 2015, A partial melting study of an ordinary (H) chondrite composition with application toÿthe unique achondrite Graves Nunataks 06128 and 06129. , Meteoritics & Planetary Science, 50 , 759-781 , http://dx.doi.org/10.1111/maps.12392 . | |
| Righter, K., Satterwhite, C.E., McBride, K.M., Corrigan, C.M., Welzenbach, L.C., 2015, Curation and Allocation of Samples in the U.S. Antarctic Meteorite Collection. 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. 43-63 . | |
| Mittlefehldt, D.W., and McCoy, T.J., 2015, Achondrites and Irons: Products of Magmatism on Strongly Heated Asteroids. 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. 79-99 . | |
| McCoy, T.J., 2015, Meteorite Misfits: Fuzzy Clues to Solar System Processes. 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. 145-152 . | |
| Wang, K., Day, J., Korotev, R. L., Zeigler, R. A., Moynier, F., 2014, Iron isotope fractionation during sulfide-rich felsic partial melting in early planetesimals. , Earth and Planetary Science Letters, 392 , 124-132 . | |
| Lindsay, F. N., Herzog, G. F., Park, J., Delaney, J. S., Turrin, B. D., Swisher III, C. C., 2014, 40Ar/39Ar dating of microgram feldspar grains from the paired feldspathic achondrites GRA 06128 and 06129. , Geochimica et Cosmochimica Acta, 129 , 15-Mar-14 , 96-110 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2013.12.023 . | |
| Day, J. M. D., Taylor, L. A., Walker, R. J., Ash, R. D., Liu, Y., Rumble III, D., Irving, A. J., Goodrich, C. A., Tait, K., McDonough, W. F., 2012, Origin of felsic achondrites Graves Nunataks 06128 and 06129, and ultramafic brachinites and brachinite-like achondrites by partial melting of volatile-rich primitive parent bodies. , Geochimica et Cosmochimica Acta, 81 , 15-Mar-12 , 94-128 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2011.12.017 . | |
| Allen, C., Allton, J., Lofgren, G., Righter, K., Zolensky, M. E., 2011, Curating NASA's extraterrestrial samples-Past, present, and future. , Chemie der Erde - Geochemistry, 71 Issue 1 , 2011 , 1-20 , ISSN 0009-2819 , http://dx.doi.org/10.1016/j.chemer.2010.12.003 . | |
| Shearer, C. K., Burger, P. V., Papike, J. J., Sharp, Z. D., Mckeegan, K. D., 2011, Fluids on differentiated asteroids: Evidence from phosphates in differentiated meteorites GRA 06128 and GRA 06129. , Meteoritics & Planetary Science, 46 , 1345-1362 , http://dx.doi.org/10.1111/j.1945-5100.2011.01233.x . | |
| Rochette, P., Gattacceca, J., Ivanov, A. V., Nazarov, M. A., Bezaeva, N. S., 2010, Magnetic properties of lunar materials: Meteorites, Luna and Apollo returned samples. , Earth and Planetary Science Letters, 292 Issues 3-4 , 1-Apr-10 , 383-391 , ISSN 0012-821X , http://dx.doi.org/10.1016/j.epsl.2010.02.007 . | |
| Shearer, C. K., Wadhwa, M., Gaffney, A., Shafer, J., Geissman, J., Atudorei, N. V., Herd, C., Weiss, B. P., King, P. L., Crowther, S. A., Gilmour, J. D., Burger, P. V., Neal, C., Sharp, Z., Spivak-Birndorf, L., Borg, L., Fernandes, V. A., Papike, J. J., Karner, J., 2010, Non-basaltic asteroidal magmatism during the earliest stages of solar system evolution: A view from Antarctic achondrites Graves Nunatak 06128 and 06129. , Geochimica et Cosmochimica Acta, 74 Issue 3 , 1-Feb-10 , 1172-1199 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2009.10.029 . | |
| Day, J. M. D., Ash, R. D., Lui, Y., Bellucci, J. J., Rumble III, D., McDonough, W. F., Walker, R. J., Taylor, L. A., 2009, Early formation of evolved asteroidal crust. , Nature, 457 , 179-182 . | |
| Arculus, R., Campbell, I. H., Mclennan, S. M., Taylor, S. R., 2009, Asteroids and andesites. , Nature, 459 , E1-1 . | |
| Shearer, C. K., Gaffney, A. M., Shafer, J., Weiss, B. P., Geissman, J., Fernandes, V. A., Burger, P. V., Neal, C. R., Sharp, Z., Borg, L. E., Spivak-Birndorf, L., Wadhwa, M., Papike, J. J., Karner, J. M., 2008, A unique glimpse into asteroidal melting processes in the early solar system from the Graves Nunatak 06128/06129 achondrites. , American Mineralogist, 93 , 1937-1940 . | |
| RELAB, , Reflectance Experiment Lab , catalogue of samples, . | |
| , PLATE Preface-Pictorial Guide to Selected Meteorites, 2015, In Righter, K., Corrigan, C.M., McCoy, T.J., and Harvey, R.P. Meteorites: A Pictorial Guide to the Collection, First Edition , AGU Wiley, Book Plates, . | |