Sample Petrographic Description
Sample Number | GRA 06129 |
Newsletter | 30,2 |
Location | Graves Nunataks |
Field Number | 17713 |
Dimensions (cm) | 8.0 x 5.0 x 2.5 |
Weight (g) | 196.45 |
Original Classification | Achon. Ungrouped |
Pairing | GRA 06128; GRA 06129; |
Mineral Composition (%Fa & %Fs) | |
Fayalite (mol%): 59;Ferrosilite (mol%): 19-44 | |
Weathering | |
C | |
Fracturing | |
B/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 : 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] |
Antarctic Meteorite Images for Sample GRA 06129 | ||||
Lab Photo(s) : | ||||
Antarctic Meteorite Images for Sample GRA 06129 | ||||
Thin Section Photo(s) : | ||||
References for Sample GRA06129 | |
Frossard, P., Israel, C., Bouvier, A., and Boyet, M., 2022, Earth's composition was modified by collisional erosion, Science, 377, 1529-1532, doi:10.1016/j.gca.2021.12.027. | |
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. | |
Zhou, Q. , Yin, Q., Shearer, C. K., Li, X. , Li, Q., Liu, Y., Tang, G., and Li, C., 2018, U-Pb and Pb-Pb apatite ages for Antarctic achondrite Graves Nunataks 06129. Meteorit Planet Sci, 53, 448-466, doi:10.1111/maps.13026. | |
Zhou, Q., Yin, Q.Z., Shearer, C.K., Li, X.H., Li, Q.L., Liu, Y., Tang, G.Q., and Li, C.L., 2018, U-Pb and Pb-Pb apatite ages for Antarctic achondrite Graves Nunataks 06129. Meteoritics & Planetary Science, 53, 448-466, doi: 10.1111/maps.13026. | |
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., 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. | |
Day, J.M.D., Corder, C.A., Rumble III, D., Assayag, N., Cartigny, P., and Taylor, L.A., 2015, Differentiation processes in FeO-rich asteroids revealed by the achondrite Lewis Cliff 88763, Meteoritics & Planetary Science, 50, 1750-1766, doi:10.111/maps.12509. | |
Claydon, J. L., Crowther, S. A., Fernandes, V. A., Gilmour, J. D., 2015, Noble gases and halogens in Graves Nunataks 06129: The complex thermal history of a felsic asteroid crust. Geochimica et Cosmochimica Acta, 159, 15-Jun-15, 177-189, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2015.03.013. | |
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. | |
Goldmann, A., Brennecka, G., Noordmann, J., Weyer, S., Wadhwa, M., 2015, The uranium isotopic composition of the Earth and the Solar System. Geochimica et Cosmochimica Acta, 148, 1-Jan-15, 145-158, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2014.09.008. | |
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. | |
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. |