Sample Petrographic Description
| Sample Number | PCA 02007 |
| Newsletter | 26,2 |
| Location | Pecora Escarpment |
| Field Number | 13690 |
| Dimensions (cm) | 4.0 x 3.5 x 1.0 |
| Weight (g) | 22.37 |
| Original Classification | Lunar-Basaltic Breccia |
| Updated Classification | Lunar-Anorth. Breccia |
| Mineral Composition (%Fa & %Fs) | |
| Ferrosilite (mol%): 19-50 | |
| Weathering | |
| B | |
| Fracturing | |
| A/B | |
| Macroscopic Description - Kathleen McBride | |
| This is a disk shaped meteorite with brown exterior on the top portion of the rock. The bottom face has tan colored, ropy glass with a frothy appearance. Polygonal fractures and various clasts of different sizes, shapes and colors can be seen. The interior is composed of a hard, dark gray matrix with white clasts. Underneath the tan ropy glass is a layer of shiny green glass. | |
| Thin Section Description (,4) - Tim McCoy, Linda Welzenbach | |
| The section consists of an extremely fine-grained (melt?) matrix with isolated mineral grains and fine- to coarse-grained basaltic clasts in all size ranges up to 2 mm. Microprobe analyses reveal olivine of Fa27-33, pyroxene in a wide range of compositions from pigeonite Fs50Wo4 to augite of Fs19Wo43 with intermediate and more FeO-rich compositions, and plagioclase of An64-100 (with the most An96-100). The Fe/Mn ratio of the pyroxene averages ~53. The meteorite is a basaltic lunar breccia. | |
| Reclassification Notes (AMN 30,2) | |
| PCA 02007 was originally classified as a basaltic regolith breccia, but detailed studies have shown that most clasts and material in this sample are feldspathic; e.g., Korotev, R.L. and Zeigler, R.A. (2006) Geochimica et Cosmochimica Acta 70, 5935–5956. | |
| Antarctic Meteorite Images for Sample PCA 02007 | ||||
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| 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 02007 | ||||
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| Antarctic Meteorite Images for Sample PCA 02007 | ||||
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| References for Sample PCA02007 | |
| Gross, J., Treiman, A. H., & Harlow, G. E. , 2017, Reported sulfate mineral in lunar meteorite PCA 02007 is impact glass. . , Meteoritics & Planetary Science, 52 , 191-194 , doi: 10.1111/maps.12741 . | |
| Korotev, R.L., and Zeigler, R.A., 2015, ANSMET Meteorites from the Moon. 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. 101-130 . | |
| Herzog, G.F., Caffee, M.W., and Jull, A.J.T., 2015, Cosmogenic Nuclides in Antarctic Meteorites. 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. 153-172 . | |
| Joy, K. H., Zolensky, M. E., Nagashima, K., Huss, G. R., Ross, D. K., Mckay, D. S., Kring, D. A., 2012, Direct detection of projectile relics from the end of the lunar basin-forming epoch. , Science, 336(6087) , 1426-1429 . | |
| Fritz, J., 2012, Impact ejection of lunar meteorites and the age of Giordano Bruno. , Icarus, 221 Issue 2 , November-December 2012 , 1183-1186 , ISSN 0019-1035 , http://dx.doi.org/10.1016/j.icarus.2012.08.019 . | |
| Joy, K. H., Crawford, I. A., Russell, S. S., Kearsley, A. T., 2010, Lunar meteorite regolith breccias: An in situ study of impact melt composition using LA-ICP-MS with implications for the composition of the lunar crust. , Meteoritics & Planetary Science, 45 , 917-946 , http://dx.doi.org/10.1111/j.1945-5100.2010.01067.x . | |
| Rochette, P., Gattacceca, J., Ivanov, A. V., Nazarov, M. A., Bezaeva, N. S., 2010, Magnetic properties of lunar materials: Meteorites, Luna and Apollo returned samples. , Earth and Planetary Science Letters, 292 Issues 3-4 , 1-Apr-10 , 383-391 , ISSN 0012-821X , http://dx.doi.org/10.1016/j.epsl.2010.02.007 . | |
| Korotev, R. L., Zeigler, R. A., Jolliff, B. L., 2006, Feldspathic lunar meteorites Pecora Escarpment 02007 and Dhofar 489: Contamination of the surface of the lunar highlands by post-basin impacts. , Geochimica et Cosmochimica Acta, 70 Issue 24 , 15-Dec-06 , 5935-5956 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2006.09.016 . | |
| Day, J. M. D., Floss, C., Taylor, L. A., Anand, M., Patchen, A. D., 2006, Evolved mare basalt magmatism, high Mg/Fe feldspathic crust, chondritic impactors, and the petrogenesis of Antarctic lunar breccia meteorites Meteorite Hills 01210 and Pecora Escarpment 02007. , Geochimica et Cosmochimica Acta, 70 Issue 24 , 15-Dec-06 , 5957-5989 , ISSN 0016-7037 , http://dx.doi.org/10.1016/j.gca.2006.05.001 . | |
| Korotev R. L., 2005, Lunar geochemistry as told by lunar meteorites. , Chemie der Erde, 65 , 297-346 . | |
| Warren, P. H., 2005, "New" lunar meteorites: Implications for composition of the global lunar surface, lunar crust, and the bulk Moon. , Meteoritics & Planetary Science, 40 , 477-506 , http://dx.doi.org/10.1111/j.1945-5100.2005.tb00395.x . | |