Lunar Meteorite: Pecora Escarpment 02007

Three views of Pecora Escarpment 02007 (22.4 g). The fusion crust on PCA 02007 is frothy and vesicular because the meteorite is a gas-rich regolith breccia, like QUE 93069. The fusion crust on feldspathic lunar breccias is lighter in color that that on chondrites and basaltic meteorites. Photo credit: NASA/JSC
Small chips of PCA 02007 in the lab. The green lines in the background are 2 mm apart. Photo credit: Ryan Zeigler
Backscattered-electron image of PCA 02007, a regolith breccia. At the top and right is the glassy, vesicular fusion crust that occurs on the exterior of the meteorite in the photos above; the vesicles (gas bubbles) are black in this image. At the bottom of the image is the brecciated interior of the meteorite. Note that there is a sharp demarcation between the fusion crust and the interior, which did not get hot enough to melt. Longest dimension: 1.3 cm. Photo credit: Ryan Zeigler
Transmitted-light photograph of the same thin section. Photo credit: Ryan Zeigler

Listed in The Meteoritical Bulletin, No. 88

from Antarctic Meteorite Newsletter, vol. 26, no. 2, August, 2003

Pecora Escarpment 02007 (PCA 02007)

Transantarctic Mountains, Antarctica
Field No.: 13690
Dimensions (cm): 4.0×3.5×1.0
Mass: 22.372 g (1 piece)

Lunar-Basaltic Breccia*

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 (,4) Description: 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.

Randy Says…

*PCA 02007 is actually a feldspathic breccia (26% Al2O3, 6.3% FeO), not a basaltic breccia.

More Information

Meteoritical Bulletin Database

PCA 02007


ANSMET Location Map

Day J. M. D., Floss C., Taylor L. A., Anand M. and 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 02007Geochimica et Cosmochimica Acta 70, 5957-5989.

Fritz J. (2012) Impact ejection of lunar meteorites and the age of Giordano BrunoIcarus 221, 1183-1186.

Gross J., Treiman A. H., and Harlow G. E. (2017) Reported sulfate mineral in lunar meteorite PCA 02007 is impact glassMeteoritics and Planetary Science 52, 191–194.

Joy K. H. (2013) Trace elements in lunar plagioclase as indicators of source lithology44th Lunar and Planetary Science Conference, abstract no. 1033.

Joy K. H., Crawford I. A., Russell S. S., Swinyard B., Kellett B., and Grande M. (2006) Lunar regolith breccias MET 01210, PCA 02007 and DAG 400: Their importance in understanding the lunar surface and implications for the scientific analysis of D-CIXS dataLunar and Planetary Science XXXVII, abstract no. 1274.

Joy K. H., Crawford I. A., Russell S. S., and 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 crustMeteoritics & Planetary Science 45, 917-946.

Joy K. H., Zolensky M. E., Nagashima K., Huss G. R., Ross D. K., McKay D. S., and Kring D. A. (2012) Direct detection of projectile relics from the end of the lunar basin–forming epochScience, 10.1126/science.1219633.

Korotev R. L. (2005) Lunar geochemistry as told by lunar meteoritesChemie der Erde 65, 297-346.

Korotev R. L. and Zeigler R. A. (2014) Chapter 6. ANSMET Meteorites from the Moon, Thirty-five Seasons of U.S. Antarctic Meteorites (1976–2010): A Pictorial Guide to the Collection (editors K. Righter, R. P. Harvey, C. M. Corrigan, and T. J. McCoy), 101–130, Special Publications 68, American Geophysical Union, Washington, D. C., 296 pages, ISBN: 978-1-118-79832-4.

Korotev R. L., Zeigler R. A., and Jolliff B. L. (2004) Compositional constraints on the launch pairing of LAP 02205 and PCA 02007 with other lunar meteoritesLunar and Planetary Science XXXV, abstract no. 1416.

Korotev R. L., Zeigler R. A., and Jolliff B. L. (2006) Feldspathic lunar meteorites Pecora Escarpment 02007 and Dhofar 489: Contamination of the surface of the lunar highlands by post-basin impactsGeochimica et Cosmochimica Acta 70, 5935-5956.

Korotev R. L., Jolliff B. L., and Zeigler R. A. (2010) On the origin of the moon’s feldspathic highlands, pure anorthosite, and the feldspathic lunar meteorites41st Lunar and Planetary Science Conference, abstract no. 1440.

Liu Y., Zhang A., and Taylor L. A. (2009) Fragments of asteroids in lunar rocks. 72nd Annual Meeting of the Meteoritical Society, abstract no. 5434.

Nishiizumi K., Hillegonds D. J., and Welten K. C. (2006) Exposure and terrestrial histories of lunar meteorites LAP 02205/02224/02226/02436, MET 01210, and PCA 02007Lunar and Planetary Science XXXVII, abstract no. 2369.

Satterwhite C. E. and Righter K. (2013). Curator’s comments: Calcium sulfate found in lunar meteorite PCA 02007Antarctic Meteorite Newsletter 36:1–2.

Taylor L. A., Anand M., Neal C., Patchen A., and Kramer G. (2004) Lunar meteorite PCA 02 007: A feldspathic regolith breccia with mixed mare/highland componentsLunar and Planetary Science XXXV, abstract no. 1755.

Taylor L. A, Patchen A., Floss C, and Taylor D. (2004) An unusual meteorite clast in lunar regolith breccia, PCA 02-00767th Annual Meteoritical Society Meeting, abstract no. 5183.

Vaughan W. M., Wittmann A., Joy K. H., Lapen T. J., and Kring D. A. (2011) Provenance of impact melt and granulite clasts in lunar meteorite PCA 0200742nd Lunar and Planetary Science Conference, abstract no. 1247.

Will P., Maden C., and Busemann H. (2016) Noble gases in recently found hot and cold desert lunar meteorites. 79th Annual Meeting of the Meteoritical Society, abstract no. 6548.

Will P., Busemann H., Riebe M. E. I., and Maden C. (2019) Regolith history of six lunar regolith breccias derived from noble gas elemental and isotopic abundances. 82nd Annual Meeting of the Meteoritical Society, abstract no. 6494.

Zeigler R. A., Korotev R. L., and Jolliff B. L. (2004) Petrography of lunar meteorite PCA 02007, a new feldspathic regolith brecciaLunar and Planetary Science XXXV, abstract no. 1978.