Antarctic Meteorite Petrographic Description

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Sample Petrographic Description

Sample Number

PCA 91007

Newsletter

15,2

Location

Pecora Escarpment

Field Number

7729

Dimensions (cm)

6.8 x 4.8 x 4.5

Weight (g)

223.57

Original Classification

Eucrite

Updated Classification

Eucrite (Brecciated)

Mineral Composition (%Fa & %Fs)

Ferrosilite (mol%): 35-56

Weathering

A/Be

Fracturing

Macroscopic Description - Cecilia Satterwhite

Shiny, black fusion crust covers 40% of the exterior of PCA91007. The interior matrix is medium to coarse grained, and medium gray in color. Abundant green crystals, and minor amounts of metal and oxidation characterize this eucrite.

Thin Section Description (,8) - Brian Mason

The section shows a uniform fine-grained aggregate of granular pyroxene and acicular plagioclase (plagioclase needles up to 0.3 mm long). The proportion of pyroxene to plagioclase is approximately 2:1. Microprobe analyses show pyroxene compositions ranging fairly continuously from Wo₅Fs₅₆ to Wo₃₀Fs₃₅, the range in En content being quite limited. Plagioclase composition is somewhat variable, An_80-91. The meteorite is a eucrite.

Reclassification Notes (AMN 17,1)

Re-classified to brecciated eucrite in Meteoritical Bulletin 76 and also AMN vol. 17 no. 1.

Antarctic Meteorite Images for Sample PCA 91007

Lab Photo(s) :

Antarctic Meteorite Images for Sample PCA 91007

Thin Section Photo(s) :

Thin Section Photograph of Sample PCA 91007 in Cross-Polarized Light

Thin Section Photograph of Sample PCA 91007 in Plane-Polarized Light

References for Sample PCA91007

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.

Abernethy, F. A., Verchovsky, A. B., Franchi, I. A., & Grady, M. M., 2018, Basaltic volcanism on the angrite parent body: Comparison with 4 Vesta. Meteorit Planet Sci, 53, 375-393, doi:10.1111/maps.13016 .

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.

Mittlefehldt, D. W., 2015, Asteroid (4) Vesta: I. The howardite-eucrite-diogenite (HED) clan of meteorites. Chemie der Erde - Geochemistry, 75 Issue 2, Jun-15, 155-183, ISSN 0009-2819, http://dx.doi.org/10.1016/j.chemer.2014.08.002.

Beck, A. W., Lawrence, D. J., Peplowski, P. N., Prettyman, T. H., Mccoy, T. J., Mcsween, H. Y., Toplis, M. J., Yamashita, N., 2015, Using HED meteorites to interpret neutron and gamma-ray data from asteroidÿ4 Vesta. Meteoritics & Planetary Science, 50, 1311-1337, http://dx.doi.org/10.1111/maps.12467.

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.

Schiller, M., Baker, J., Creech, J., Paton, C., Millet, M., Irving, A., Bizzarro, M., 2011, Rapid Timescales for Magma Ocean Crystallization on the Howardite-Eucrite-Diogenite Parent Body. ApJ, 740, L22, http://dx.doi.org/10.1088/2041-8205/740/1/L22.

Usui, T., Mcsween Jr., H. Y, Mittlefehldt, D. W., Prettyman, T. H., 2010, K-Th-Ti systematics and new three-component mixing model of HED meteorites: Prospective study for interpretation of gamma-ray and neutron spectra for the Dawn mission. Meteoritics & Planetary Science, 45, 1170-1190, http://dx.doi.org/10.1111/j.1945-5100.2010.01071.x.

Scott, E. R. D., Greenwood, R. C., Franchi, I. A., Sanders, I. S., 2009, Oxygen isotopic constraints on the origin and parent bodies of eucrites, diogenites, and howardites. Geochimica et Cosmochimica Acta, 73 Issue 19, 1-Oct-09, 5835-5853, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2009.06.024.

Warren, P. H., Kallemeyn, G. W., Huber, H., Ulff-MÃ¸ller, F., Choe, W., 2009, Siderophile and other geochemical constraints on mixing relationships among HED-meteoritic breccias. Geochimica et Cosmochimica Acta, 73 Issue 19, 1-Oct-09, 5918-5943, ISSN 0016-7037, http://dx.doi.org/10.1016/j.gca.2009.06.030.

Mccoy, T. J., Ketcham, R. A., Wilson, L., Benedix, G. K., Wadhwa, M., Davis, A. M., 2006, Formation of vesicles in asteroidal basaltic meteorites. Earth and Planetary Science Letters, 246 Issues 1-2, 15-Jun-06, 102-108, ISSN 0012-821X, http://dx.doi.org/10.1016/j.epsl.2006.04.002.

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.

Bogard, D. D., Garrison, D. H., 2003, 39Ar-40Ar ages of eucrites and thermal history of asteroid 4 Vesta. Meteoritics & Planetary Science, 38, 669-710.

Mittlefehldt, D. W., Lindstrom, M. M., 2003, Geochemistry of eucrites: genesis of basaltic eucrites, and Hf and Ta as petrogenetic indicators for altered antarctic eucrites. Geochimica et Cosmochimica Acta, 67 Issue 10, 15-May-03, 1911-1934, ISSN 0016-7037, http://dx.doi.org/10.1016/S0016-7037(02)01411-4.

Burbine, T. H., Buchanan, P. C., Binzel, R. P., Bus, S. J., Hiroi, T., Hinrichs, J. L., Meibom, A., McCoy, T. J., 2001, Vesta, Vestoids, and the howardite, eucrite, diogenite group: Relationships and the origin of spectral differences. Meteoritics and Planetary Science, 36, 761-781.

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

Yamaguchi, A., Taylor, G. J., Keil, K., 1996, Global Crustal Metamorphism of the Eucrite Parent Body. Icarus, 124, 97-112.

RELAB, , Reflectance Experiment Lab , catalogue of samples.

Antarctic Meteorite Petrographic Description

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