Antarctic Meteorite Petrographic Description

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Sample Petrographic Description

Sample Number

GRA 95209

Newsletter

20,1

Location

Graves Nunataks

Field Number

8604

Dimensions (cm)

10.5 x 8.0 x 5.0

Weight (g)

948.80

Original Classification

Lodranite

Mineral Composition (%Fa & %Fs)

Fayalite (mol%): 7;Ferrosilite (mol%): 7

Weathering

Fracturing

A/B

Macroscopic Description - Kathleen McBride

The exterior of this meteorite has a thin, dark brown, melted-appearing fusion crust. One fracture runs across one surface and evaporite deposits are visible on the edge of another surface. Chondrules on the surface appear lighter than the matrix. The interior of the meteorite is very rusty. This meteorite was very coherent and had to be pried apart along complete fractures during chipping. Metal grains are numerous including areas of concentrated metals and metal sulfides, the largest of this being 1 cm in diameter. Clasts are present as well including some as large as 1 cm.

Thin Section Description (,7) - Brian Mason

The section shows an equigranular aggregate (grains averaging 0.3 mm) of subequal amounts of nickel-iron, olivine, and pyroxene, with a little plagioclase. A minor amount of brown limonitic staining pervades the section. Microprobe analyses give the following mineral compositions; olivine, Fa₇; orthopyroxene, Wo₃Fs₇; clinopyroxene, Wo₄₁Fs₅ ; plagioclase, An₁₉. The meteorite is classified as a lodranite

Antarctic Meteorite Images for Sample GRA 95209

Lab Photo(s) :

Lab Photo of Sample GRA 95209 Showing Bottom View

Lab Photo of Sample GRA 95209 Showing East View

Lab Photo of Sample GRA 95209 Showing Slab

Lab Photo of Sample GRA 95209 Showing Splits

Antarctic Meteorite Images for Sample GRA 95209

Thin Section Photo(s) :

Thin Section Photograph of Sample GRA 95209 in Cross-Polarized Light

Thin Section Photograph of Sample GRA 95209 in Plane-Polarized Light

References for Sample GRA95209

Hopp, T., Kleine, T., 2021, Ruthenium isotopic fractionation in primitive achondrites: Clues to the early stages of planetesimal melting. , Geochimica et Cosmochimica Acta, 302 , 46–60 , https://doi.org/10.1016/j.gca.2021.03.016 .

Hidaka, Y., Shirai, N., Yamaguchi, A., & Ebihara, M., 2019, Siderophile element characteristics of acapulcoite–lodranites and winonaites: Implications for the early differentiation processes of their parent bodies. , Meteoritics & Planetary Science, 54 , 1153-1166 .

Worsham, E. A., Bermingham, K. R., & Walker, R. J. , 2017, Characterizing cosmochemical materials with genetic affinities to the Earth: Genetic and chronological diversity within the IAB iron meteorite complex. . , Earth and Planetary Science Letters, 467 , 157-166 , https://doi.org/10.1016/j.epsl.2017.02.044 .

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 .

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 .

Grady, M.M., Pratesi G., and Moggi Cecchi, V., 2014, Atlas of Meteorites , Cambridge University Press, Cambridge, UK, , 384 p. .

Greenwood, R. C., Franchi, I. A., Gibson, J. M., Benedix, G. K., 2012, Oxygen isotope variation in primitive achondrites: The influence of primordial, asteroidal and terrestrial processes. , Geochimica et Cosmochimica Acta, 94 , 1-Oct-12 , 146-163 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2012.06.025 .

Bogard, D. D., 2011, K-Ar ages of meteorites: Clues to parent-body thermal histories. , Chemie der Erde - Geochemistry, 71 Issue 3 , Aug-11 , 207-226 , ISSN 0009-2819 , http://dx.doi.org/10.1016/j.chemer.2011.03.001 .

Grew, E. S., Yates, M. G., Beane, R. J., Floss, C., Gerbi, C., 2010, Chopinite-sarcopside solid solution, [(Mg,Fe)3□](PO4)2, in GRA95209, a transitional acapulcoite: Implications for phosphate genesis in meteorites. , American Mineralogist, 95 , 260-272 .

Crowther, S. A., Whitby, J. A., Busfield, A., Holland, G., Busemann, H., Gilmour, J. D., 2009, Collisional modification of the acapulcoite/lodranite parent body revealed by the iodine-xenon system in lodranites. , Meteoritics & Planetary Science, 44 , 1151-1159 , http://dx.doi.org/10.1111/j.1945-5100.2009.tb01214.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. C., 2008, 182Hf-182W chronometry and the early evolution history in the acapulcoite-lodranite parent body. , Meteoritics & Planetary Science, 43 , 675-684 , http://dx.doi.org/10.1111/j.1945-5100.2008.tb00677.x .

Rubin, A. E., 2007, Petrogenesis of acapulcoites and lodranites: A shock-melting model. , Geochimica et Cosmochimica Acta, 71 Issue 9 , 1-May-07 , 2383-2401 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2007.02.010 .

Mccoy, T. J., Carlson, W. D., Nittler, L. R., Stroud, R. M., Bogard, D. D., Garrison, D. H., 2006, Graves Nunataks 95209: A snapshot of metal segregation and core formation. , Geochimica et Cosmochimica Acta, 70 Issue 2 , 15-Jan-06 , 516-531 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2005.09.019 .

Rai, V. K., Jackson, T. L., Thiemens, M. H., 2005, Photochemical Mass-Independent Sulfur Isotopes in Achondritic Meteorites. , Science, 309 , 1062-1065 , http://dx.doi.org/10.1126/science.1112954 .

Schultz, L., Franke, L., 2004, Helium, neon, and argon in meteorites: A data collection. , Meteoritics & Planetary Science, 39 , 1889-1890 , http://dx.doi.org/10.1111/j.1945-5100.2004.tb00083.x .

Boynton, W. V., Hill, D. H., Patzer, A., 2004, Evolution and classification of acapulcoites and lodranites from a chemical point of view. , Meteoritics & Planetary Science, 39 , 61-85 .

Crozaz, G., Floss, C., Wadhwa, M., 2003, Chemical alteration and REE mobilization in meteorites from hot and cold deserts. , Geochim. Cosmochim. Acta, 67 , 4727-4741 .

Busemann, H., Eugster, O., 2002, The trapped noble gas component in achondrites. , Meteoritics & Planetary Science, 37 , 1865-1891 .

Walker, R. J., Horan, M. F., Morgan, J. W., Becker, H., Grossman, J. N., Rubin, A. E., 2002, Comparative 187Re-187Os systematics of chondrites: Implications regarding early solar system processes. , Geochimica et Cosmochimica Acta, 66 Issue 23 , 1-Dec-02 , 4187-4201 , ISSN 0016-7037 , http://dx.doi.org/10.1016/S0016-7037(02)01003-7 .

Mccoy, T. J., Nittler, L. R., Burbine, T. H., Trombka, J. I., Clark, P. E., Murphy, M. E., 2000, Anatomy of a Partially Differentiated Asteroid: A "NEAR"-Sighted View of Acapulcoites and Lodranites. , Icarus, 148 Issue 1 , Nov-00 , 29-36 , ISSN 0019-1035 , http://dx.doi.org/10.1006/icar.2000.6494 .

Terribilini, D., Eugster, O., Herzog, G. F., Schnabel, C., 2000, Evidence for common breakup events of the acapulcoites-lodranites and chondrites. , Meteoritics & Planetary Science, 35 , 1043-1050 .

Floss, C., 2000, Complexities on the acapulcoite-lodranite parent body: Evidence from trace element distributions in silicate minerals. , Meteoritics & Planetary Science, 35 , 1073-1085 .

Garrison, D., Hamlin, S., Bogard, D., 2000, Chlorine abundances in meteorites. , Meteoritics & Planetary Science, 35 , 419-429 .

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, .

Antarctic Meteorite Petrographic Description

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