Antarctic Meteorite Petrographic Description

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Sample Petrographic Description

Sample Number

LAR 04315

Newsletter

28,2

Location

Larkman Nunatak

Field Number

15558

Dimensions (cm)

12.5 x 7.0 x 5.0

Weight (g)

1164.80

Original Classification

Ureilite (Anomalous)

Mineral Composition (%Fa & %Fs)

Fayalite (mol%): 2-19

Weathering

B/C

Fracturing

Macroscopic Description - Kathleen McBride

Dark brown/black patchy fusion crust covers 65% of the exterior. Exposed interior is dark in color with lighter inclusions. The interior is dark, ultramafic with a few light inclusions. This hard meteorite is rusty and has a coarse grained texture. Weathering is more extensive near the exterior.

Thin Section Description (,7) - Tim McCoy

The section consists of an aggregate of large olivine and pyroxene grains up to 2 mm across. Olivine grains are rimmed by carbon-rich material containing traces of metal. While these metal-bearing rims appear to define individual olivine crystals, those crystals exhibit subdomains a few hundred microns across in transmitted light and no reduction is observed between the subdomains. Olivine has cores of Fa₁₉, with rims reduced to Fa₂. Metal and sulfide form veins between the olivines, with metal often forming rounded blebs within the sulfide. The pyroxene grains are dominantly pigeonite (Fs_7-9Wo_7-9) and exhibit a wormy texture with elongate and irregular voids (graphite-filled?), and inclusions of metal and sulfide (sometimes associated with the voids). Within the pigeonites, but distinct from the voids, are found inclusions of subcalcic augite (Fs_7-9Wo_24-28) and, in association, an apparently non-stoichiometric phase highly enriched in SiO₂, and contains Al₂O₃. The meteorite is an anomalous ureilite.
Oxygen isotope analysis - J. Farquhar:
δ¹⁸O = 7.2 per mil; Δ¹⁷O = -0.8 per mil

Antarctic Meteorite Images for Sample LAR 04315

Field Photo(s) :

ANSMET LAR 04315 - Field Number: 15558, NASA Photo Number: jsc2019e009359

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 LAR 04315

Lab Photo(s) :

Lab Photo of Sample LAR 04315 Showing East View

Lab Photo of Sample LAR 04315 Showing North View

Lab Photo of Sample LAR 04315 Showing South View

Lab Photo of Sample LAR 04315 Showing West View

References for Sample LAR04315

Li, Y., McCausland, P.J.A., and Flemming, R.L., 2021, Quantitative shock measurement of olivine in ureilite meteorites. , Meteoritics & Planetary Science, 56 , 1422–1439 , doi: 10.1111/maps.13706 .

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 .

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 .

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 .

Barrat, J. A., Rouxel, O., Wang, K., Moynier, F., Yamaguchi, A., Bischoff, A., Langlade, J., 2015, Early stages of core segregation recorded by Fe isotopes in an asteroidal mantle. , Earth and Planetary Science Letters, 419 , 1-Jun-15 , 93-100 , ISSN 0012-821X , http://dx.doi.org/10.1016/j.epsl.2015.03.026 .

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 .

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 .

Warren, P. H., 2012, Parent body depth-pressure-temperature relationships and the style of the ureilite anatexis. , Meteoritics & Planetary Science, 47 , 209-227 , http://dx.doi.org/10.1111/j.1945-5100.2011.01320.x .

Warren, P. H., Rubin, A. E., 2010, Pyroxene-selective impact smelting in ureilites. , Geochimica et Cosmochimica Acta, 74 Issue 17 , 1-Sep-10 , 5109-5133 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2010.05.026 .

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 .

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 .

Antarctic Meteorite Petrographic Description

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