Antarctic Meteorite Petrographic Description

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Sample Petrographic Description

Sample Number

PCA 02008

Newsletter

27,1

Location

Pecora Escarpment

Field Number

13678

Dimensions (cm)

3.0 x 2.0 x 2.0

Weight (g)

19.10

Original Classification

Diogenite

Pairing

PCA 02008; PCA 02017

Mineral Composition (%Fa & %Fs)

Ferrosilite (mol%): 23-26

Weathering

Fracturing

A/B

Macroscopic Description - Kathleen McBride

The exteriors of these diogenites have smooth, shiny black fusion crust. The interiors are fine-grained, medium gray matrix with light gray and cream colored inclusions.

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

These sections show a groundmass of coarse (up to 2 mm) comminuted pyroxene with minor SiO₂, olivine (Fa_25-29) and plagioclase (An₉₀). Orthopyroxene has a composition of Fs_17-26Wo_2-3 and an Fe/Mn ratio of ~28-30. The meteorites are diogenites and are probably paired.

Antarctic Meteorite Images for Sample PCA 02008

Field Photo(s) :

ANSMET PCA 02008 - Field Number: 13678, NASA Photo Number: jsc2018e103507

ANSMET PCA 02008 - Field Number: 13678, NASA Photo Number: jsc2018e103508

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 PCA 02008

Lab Photo(s) :

Lab Photo of Sample PCA 02008 Showing Bottom South View

Lab Photo of Sample PCA 02008 Showing Top East View

Lab Photo of Sample PCA 02008 Showing Top North View

Lab Photo of Sample PCA 02008 Showing Top South View

Lab Photo of Sample PCA 02008 Showing Top West View

References for Sample PCA02008

Hahn, T.M., Lunning, N.G., McSween, H.Y., Bodnar, R.J., and Taylor, L.A., 2017, Mg-rich harzburgites from Vesta: Mantle residua or cumulates from planetary differentiation. , Meteoritics & Planetary Science, 53 , 514-546 , doi: 10.111/maps.13036.

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 .

Beck, A. W., Mcsween, H. Y., Bodnar, R. J., 2013, In situ laser ablation ICP-MS analyses of dimict diogenites: Further evidence for harzburgitic and orthopyroxenitic lithologies. , Meteoritics & Planetary Science, 48 , 1050-1059 , http://dx.doi.org/10.1111/maps.12129 .

Beck, A. W., Welten, K. C., McSween Jr., H. Y., Viviano, C. E., Caffee, M. W., 2012, Petrologic and textural diversity among the PCA 02 howardite group, one of the largest pieces of the Vestan surface. , Meteoritics & Planetary Science, 47 , 947-969 .

Mittlefehldt, D. W., Beck, A. W., Lee, C.-T. A., Mcsween, H. Y., Buchanan, P. C., 2012, Compositional constraints on the genesis of diogenites. , Meteoritics & Planetary Science, 47 , 72-98 , http://dx.doi.org/10.1111/j.1945-5100.2011.01314.x .

Beck, A. W., Mcsween Jr., H. Y., 2010, Diogenites as polymict breccias composed of orthopyroxenite and harzburgite. , Meteoritics & Planetary Science, 45 , 850-872 , http://dx.doi.org/10.1111/j.1945-5100.2010.01061.x .

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

Antarctic Meteorite Petrographic Description

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