Antarctic Meteorite Petrographic Description

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Sample Petrographic Description

Sample Number

GRO 95566

Newsletter

20,1

Location

Grosvenor Mountains

Field Number

10944

Dimensions (cm)

4.0 x 3.5 x 2.5

Weight (g)

50.67

Original Classification

C2 Chondrite

Updated Classification

CM Chondrite (Anomalous)

Mineral Composition (%Fa & %Fs)

Fayalite (mol%): 1-35;Ferrosilite (mol%): 2-4

Weathering

A/Be

Fracturing

A/B

Macroscopic Description - Kathleen McBride

The exterior of this carbonaceous chondrite is covered with black fusion crust. The surface is vesicular and displays polygonal fractures. It has a rough texture and is friable. One surface lacks fusion crust. The black interior reveals white material between the fusion crust and the meteorite, which may be evaporite. The numerous chondrules are less than 1 mm in size. Some condrules appear to be rusty.

Thin Section Description (,5) - Brian Mason

The section shows numerous small chondrules (up to 0.6 mm across), some irregular aggregates, and many small silicate grains in a black matrix; trace amounts of nickel-iron and troilite are present as minute grains. The silicate grains are almost entirely olivine near Mg₂SiO₄ in composition, with a few more iron-rich grains. A little pyroxene near MgSiO₃ in composition is present. The matrix appears to consist largely of iron-rich serpentine. The meteorite is a C2 chondrite.

Reclassification Notes (AMN 41,1)

(Choe et al., 2010)

Antarctic Meteorite Images for Sample GRO 95566

Lab Photo(s) :

Antarctic Meteorite Images for Sample GRO 95566

Thin Section Photo(s) :

Thin Section Photo of Sample GRO 95566 in Cross-Polarized Light

Thin Section Photo of Sample GRO 95566 in Plane-Polarized Light

Thin Section Photo of Sample GRO 95566 in Reflected Light

References for Sample GRO95566

Hiroi, T., Ohtsuka, K., Howard, K.T., Robertson, K.R., and Milliken, R.E., Kaiden, H., Imae, N., Misawa, K., Kojima, H., Sasakia, S., Matsuokaa, M., Nakamura, T., Bish, D.L., 2021, UV-visible-infrared spectral survey of Antarctic carbonaceous chondrite chips. , Polar Science, 29 , 100723 , https://doi.org/10.1016/j.polar.2021.100723 .

Krietsch, D., Busemann, H., Riebe, M.E.I., King, A.J., Alexander, C.M.O’D., Maden, C., 2021, Noble gases in CM carbonaceous chondrites: Effect of parent body aqueous and thermal alteration and cosmic ray exposure ages. , Geochimica et Cosmochimica Acta, 310 , 240–280 , https://doi.org/10.1016/j.gca.2021.05.050 .

Torrano, Z.A., Schrader, D.L., Davidson, J., Greenwood, R.C., Dunlap, D.R., and Wadhwa, M., 2021, The relationship between CM and CO chondrites: Insights from combined analyses of titanium, chromium, and oxygen isotopes in CM, CO, and ungrouped chondrites. , Geochimica et Cosmochimica Acta, 301C , 70–90 , https://doi.org/10.1016/j.gca.2021.03.004 .

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.

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.

Kimura, M., Imae, N., Komatsu, M., Barrat, J. A., Greenwood, R. C., Yamaguchi, A., and Noguchi, T., 2020, The most primitive CM chondrites, Asuka 12085, 12169, and 12236, of subtypes 3.0–2.8: Their characteristic features and classification. , Polar Science, 26 , 100565 .

Kaplan, H. H., Milliken, R. E., Alexander, C. M. O. D., & Herd, C. D. , 2019, Reflectance spectroscopy of insoluble organic matter (IOM) and carbonaceous meteorites. , Meteoritics & Planetary Science, 54 , 1051-1068 .

Alexander, C. M. O'D., Bowden, R., Fogel, M. L., Howard, K. T., 2015, Carbonate abundances and isotopic compositions in chondrites. , Meteoritics & Planetary Science, 50 , 810-833 , http://dx.doi.org/10.1111/maps.12410 .

Alexander, C.O'D. M. O, Bowden,. R., Fogel, M. L., Howard, K. T., Herd, C. D. K., Nittler, L. R., 2012, The provenances of asteroids, and their contributions to the volatile inventories of the terrestrial planets. , Science, 337(6095) , 2012 , 721-723 .

Cloutis, E. A., Hudon, P., Hiroi, T., Gaffey, M. J., Mann, P. J., 2012, Spectral reflectance properties of carbonaceous chondrites: 8. "Other" carbonaceous chondrites: CH, ungrouped, polymict, xenolithic inclusions, and R chondrites. , Icarus, 221 Issue 2 , November-December 2012 , 984-1001 , ISSN 0019-1035 , http://dx.doi.org/10.1016/j.icarus.2012.10.008 .

Choe, W. H., Huber, H., Rubin, A. E., Kallemeyn, G. W., Wasson, J. T., 2010, Compositions and taxonomy of 15 unusual carbonaceous chondrites. , Meteoritics & Planetary Science, 45 , 531-554 , http://dx.doi.org/10.1111/j.1945-5100.2010.01039.x .

Rochette, P., Kohout, T., Pesonen, L., Quirico, E., Sagnotti, L., Skripnik, A., Gattacceca, J., Bonal, L., Bourot-Denise, M., Chevrier, V., Clerc, J. P., Consolmagno, G., Folco, L., Gounelle, M., 2008, Magnetic classification of stony meteorites: 2. Non-ordinary chondrites. , Meteoritics & Planetary Science, 43 , 959-980 , http://dx.doi.org/10.1111/j.1945-5100.2008.tb01092.x .

Clayton, R. N., Mayeda, T. K., 1999, Oxygen isotope studies of carbonaceous chondrites. , Geochimica et Cosmochimica Acta, 63 Issues 13-14 , Jul-99 , 2089-2104 , ISSN 0016-7037 , http://dx.doi.org/10.1016/S0016-7037(99)00090-3 .

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

Antarctic Meteorite Petrographic Description

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