Antarctic Meteorite Petrographic Description

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Sample Petrographic Description

Sample Number

PCA 02066

Newsletter

28,1

Location

Pecora Escarpment

Field Number

13634

Dimensions (cm)

5.5 x 3.5 x 2.0

Weight (g)

57.07

Original Classification

Howardite

Pairing

PCA 02009; PCA 02013; PCA 02014; PCA 02015; PCA 02016; PCA 02018; PCA 02019; PCA 02065; PCA 02066

Mineral Composition (%Fa & %Fs)

Ferrosilite (mol%): 24-58

Weathering

B/C

Fracturing

B/C

Macroscopic Description - Kathleen McBride

The fusion crust on these howardites range in color from brown to black and varies in thickness with some glassy spots. The interior matrix is light to medium gray in color with some rusty areas. The inclusions range from white to dark gray in color.

Thin Section Description (,4) - Cari Corrigan, Tim McCoy

These meteorites are almost certainly paired with each other and with the PCA 02009 howardite group, the original description for which is reprinted below: These sections are similar enough that a single description will suffice. Each show a groundmass of comminuted pyroxene (up to 2 mm) and plagioclase with fine- to coarse-grained basaltic, impact-melt and diogentitic clasts ranging up to 3 mm. Minerals include abundant orthopyroxene with compositions ranging from Fs_17-60Wo_2-8 (Fe/Mn ~29), augite of Fs~40, plagioclase (An_90-95) and SiO₂. These meteorites are howardites. They are almost certainly paired with each other and with PCA 02009.

Antarctic Meteorite Images for Sample PCA 02066

Field Photo(s) :

ANSMET PCA 02066 - Field Number: 13634, NASA Photo Number: jsc2018e103473

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 02066

Lab Photo(s) :

Lab Photo of Sample PCA 02066 Showing North View

Lab Photo of Sample PCA 02066 Showing South View

References for Sample PCA02066

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.

Moriarty, D. P., Pieters, C. M., 2016, Complexities in pyroxene compositions derived from absorption band centers: Examples from Apollo samples, HED meteorites, synthetic pure pyroxenes, and remote sensing data. , Meteoritics & Planetary Science, 51(2) , 207-234 .

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 .

Mittlefehldt, D. W., Herrin, J. S., Quinn, J. E., Mertzman, S. A., Cartwright, J. A., Mertzman, K. R., Peng, Z. X., 2013, Composition and petrology of HED polymict breccias: The regolith of (4) Vesta. , Meteoritics & Planetary Science, 48 , 2105-2134 , http://dx.doi.org/10.1111/maps.12182 .

Cartwright, J. A., Ott, U., Mittlefehldt, D. W., Herrin, J. S., Herrmann, S., Mertzman, S. A., Mertzman, K. R., Peng, Z. X., Quinn, J. E., 2013, The quest for regolithic howardites. Part 1: Two trends uncovered using noble gases. , Geochimica et Cosmochimica Acta, 105 , 15-Mar-13 , 395-421 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2012.11.047 .

Patzer, A., McSween Jr., H. Y., 2012, Ordinary (mesostasis) and not-so-ordinary (symplectites) late-stage assemblages in howardites. , Meteoritics & Planetary Science, 47 , 1475-1490 , http://dx.doi.org/10.1111/j.1945-5100.2012.01408.x .

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 .

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

Antarctic Meteorite Petrographic Description

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