Antarctic Meteorite Petrographic Description

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Sample Petrographic Description

Sample Number

MET 01085

Newsletter

25,2

Location

Meteorite Hills

Field Number

13057

Dimensions (cm)

3.5 x 3.5 x 2.25

Weight (g)

30.61

Original Classification

Ureilite (Anomalous)

Mineral Composition (%Fa & %Fs)

Ferrosilite (mol%): 11

Weathering

Fracturing

Macroscopic Description - Kathleen McBride

Slightly shiny, striated fusion crust covers approximately 25% of the exterior. The interior reveals a dark crystalline matrix with some rusty haloes and light colored inclusions.

Thin Section Description (,2) - Tim McCoy, Gretchen Benedix, Linda Welzenbach

During preparation of this thin section, a large (~2 mm) patch of carbonado was encountered and it remains in the potted butt. The section consists entirely of pigeonite grains up to 2 mm across. Feathery graphite is found in aggregates between the pyroxene grains. The pyroxenes exhibit undulatory extinction. Pigeonite compositions are equilibrated with Fs₁₁Wo₅. No olivine or subcalcic augite grains were found. The mineralogy and mineral compositions are consistent with classification as a ureilite, although no ureilites composed entirely of pigeonite are known (Mittlefehldt et al., 1998). The meteorite is an anomalous ureilite.

Antarctic Meteorite Images for Sample MET 01085

Field Photo(s) :

ANSMET MET 01085 - Field Number: 13057, NASA Photo Number: jsc2018e097509

ANSMET MET 01085 - Field Number: 13057, NASA Photo Number: jsc2018e097510

ANSMET MET 01085 - Field Number: 13057, NASA Photo Number: jsc2018e097511

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 MET 01085

Lab Photo(s) :

References for Sample MET01085

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.

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 .

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 .

Barrat, J. A., Dauphas, N., Gillet, P., Bollinger, C, Etoubleau, J., Bischoff, A., Yamaguchi, A., 2016, Evidence from Tm anomalies for non-CI refractory lithophile element proportions in terrestrial planets and achondrites. , Geochimica et Cosmochimica Acta, 176 , 1-17 .

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 .

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 .

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 .

Cloutis, E. A., Hudon, P., Romanek, C. S., Bishop, J. L., Reddy, V., Gaffey, M. J., Hardersen, P. S., 2010, Spectral reflectance properties of ureilites. , Meteoritics & Planetary Science, 45 , 1668-1694 , http://dx.doi.org/10.1111/j.1945-5100.2010.01065.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 .

Rankenburg, K., Humayun, M., Brandon, A. D., Herrin, J. S., 2008, Highly siderophile elements in ureilites. , Geochimica et Cosmochimica Acta, 72 Issue 18 , 15-Sep-08 , 4642-4659 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2008.07.003 .

Rankenburg, K., Brandon, A. D., Humayun, M., 2007, Osmium isotope systematics of ureilites. , Geochimica et Cosmochimica Acta, 71 Issue 9 , 1-May-07 , 2402-2413 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2007.02.015 .

Warren, P. H., Ulff-MÃ¸ller, F., Huber, H., Kallemeyn, G. W., 2006, Siderophile geochemistry of ureilites: A record of early stages of planetesimal core formation. , Geochimica et Cosmochimica Acta, 70 Issue 8 , 15-Apr-06 , 2104-2126 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2005.12.026 .

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

Antarctic Meteorite Petrographic Description

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