Listed in The Meteoritical Bulletin, No. 76
MacAlpine Hills 88104 & 88105 (MAC 88104 & 88105)
Mass (g): 61.2 (1 piece); 662.5 (1 piece)
Meteorite Type: Anorthositic Breccia
Macroscopic Description: Roberta Score. MAC88104 and MAC88105 are paired fragments of a polymict breccia. Both specimens have thin gray-green fusion crust which covers approximately 30% of the exterior surface. The other exterior surfaces are dark gray and weathered, with numerous clasts and vugs where clasts have been plucked out by weathering. A minute amount of evaporite minerals is evident in the minor cracks in the fusion crust. The interior is blue gray and mostly fine-grained, but glassy in some areas. Veins of dark vesicular glass surround some clasts, but do not transect any clasts. The meteorite contains abundant angular feldspathic clasts and fine-grained gray, black and beige clasts. The largest clast exposed (1.5 x 1 cm) is fine-grained and anorthositic, with scattered mafic minerals. Other clasts are medium-grained and more mafic.
Thin Section (MAC88104,7; 88105,6) Description: Brian Mason. The sections show a microbreccia of small (up to 0.3 mm) mineral grains, and clasts (up to 3 mm across), in a translucent to semi-opaque brown glassy matrix. The mineral grains are almost all plagioclase, except for a few olivines and pyroxenes; two pink spinel grains and one minute grain of metal or metal-sulfide were seen in 88105,6. Some of the clasts consist almost entirely of dark-brown semi-opaque glass; others show small plagioclase laths with interstitial glass; some are plagioclase-rich with minor olivine or pyroxene. Microprobe analyses show that the plagioclase is almost pure anorthite (Na2O 0.3-0.5%, K2O less than 0.1%). Olivine composition is variable, Fa10-34; most of the pyroxene is Ca-poor, averaging Wo6Fs25, but some more Ca-rich grains were analysed; the FeO/MnO ratio is very high, 50-80, characteristic of lunar material. The composition of the glassy matrix is somewhat variable, but averages (weight percent): SiO2, 45, Al2O3 28, FeO 6.3, MgO 4.7, CaO 16, Na2O 0.36, TiO2 0.32, MnO 0.11, K2O less than 0.1. The meteorite is an anorthositic microbreccia, almost certainly of lunar origin.
Oxygen Isotopic Composition: Robert Clayton. The oxygen isotopic composition of MAC88105 is d18O = 5.5, d17O = 2.7, which falls within the group of previously analyzed lunar meteorites and Apollo lunar rocks.
Thermoluminescence Data: Derek Sears. The measured natural TL values for MAC88104 and MAC88105 are 2.4 +/- 0.3 and 2.9 +/- 0.3 krad at 250 degrees C, respectively. This compares with Steve Sutton’s values of 0.75, 1.7, and 0.5 krad for ALHA81005, YAMATO-791197, and YAMATO-82192, respectively, and with typical values for most Antarctic chondrites of 20-80 krad. These low values reflect recent heating or anomalous (non-classical) fading, observed for some lunar meteorites. (Sutton, 1985, Proc. 10th Symp. Antarctic Meteorites, 133-139: 1986, Meteoritics, 21, 520-521: 1989, personal communications).
26Al Measurement: John Wacker. 26Al activity of MAC88105 is 19.5 ± 2.6 dpm/kg which is considerably lower than the 41-139 dpm/kg measured by Nishiizumi et al. (1988; Meteoritics 23, 294-295) in four other lunar meteorites. The low activity implies either an unreasonably old terrestrial age (>1 MY) or that the sample was heavily shielded on the moon and had a short transit time in space.
Compositionally, MAC 88104/88105 is a typical feldspathic lunar meteorite.
I saw both stones in the field. I thought that they probably were not meteorites.
Meteoritical Bulletin Database
Bogard D.D., Garrison D. H., and Nyquist L. E. (2000) Argon-39-argon-40 ages of lunar highland rocks and meteorites. Lunar and Planetary Science XXXI, abstract no. 1138.
Braun S. A., Brandon A. D., Joy K. H., and Kring D. A. (2011) Did meteorite bombardment sample deep lunar crust?: Major and trace element compositions of granulite clasts in lunar regolith breccia MAC 88104. 42nd Lunar and Planetary Science Conference, abstract no. 2762.
Cohen B. A., Swindle T. D., and Kring D. A. (2000) Support for the lunar cataclysm hypothesis from lunar meteorite impact melt ages. Science 290, 1754-1756.
Cohen B. A., Swindle T. D., and Kring D. A. (2005) Geochemistry and 40Ar-39Ar geochronology of impact-melt clasts in feldspathic lunar meteorites: Implications for lunar bombardment history. Meteoritics & Planetary Science 40, 755-777.
Delano J. W. (1991) Geochemical comparison of impact glasses from lunar meteorites ALHA81005 and MAC88105 and Apollo 16 regolith 64001. Geochimica et Cosmochimica Acta 55, 3019-3029.
Eugster O. (1990) Lunar meteorite MAC88105: History derived from cosmic-ray produced and solar wind trapped noble gases. Lunar and Planetary Science XXI, 337-337.
Eugster O., Burger M., Krähenbühl U., Michel Th., Beer J., Hofmann H. J., Synal H. A., Woelfli W., Finkel R. C. (1991) History of the paired lunar meteorites MAC88104 and MAC88105 derived from noble gas isotopes, radionuclides, and some chemical abundances. Geochimica et Cosmochimica Acta 55, 3139-3148.
Fritz J. (2012) Impact ejection of lunar meteorites and the age of Giordano Bruno. Icarus 221, 1183-1186.
Grier J. A., Kring D. A., and Swindle T. D. (1995) Impact melts and anorthositic clasts in lunar meteorites QUE93069 and MAC88105. Lunar and Planetary Science XXVI, 513-514.
Jolliff B. L., Korotev R. L., and Haskin L. A. (1991) A ferroan region of the lunar highlands as recorded in meteorites MAC88104 and MAC88105. Geochimica et Cosmochimica Acta 55, 3051-3071.
Joy K. H. (2013) Trace elements in lunar plagioclase as indicators of source lithology. 44th Lunar and Planetary Science Conference, abstract no. 1033.
Joy K. H., Taylor G. J., Huss G. R., Nagashima K., and Crawford I. A. (2010) An unusual magnesian troctolitic gabbro in lunar meteorite MAC 88105: An example of new rock types found in lunar meteorites. 73rd Annual Meeting of the Meteoritical Society, abstract no. 5426.
Joy K. H., Crawford I. A., G. R. Huss, Nagashima K., and G. J. Taylor (2014) An unusual clast in lunar meteorite MacAlpine Hills 88105: A unique lunar sample or projectile debris? Meteoritics & Planetary Science 49, 677–695.`
Koeberl C., Kurat G., and Brandstätter F. (1991) MAC88105 – A regolith breccia from the lunar highlands: Mineralogical, petrological, and geochemical studies. Geochimica et Cosmochimica Acta 55, 3073-3087.
Korotev R. L. (2005) Lunar geochemistry as told by lunar meteorites. Chemie der Erde 65, 297-346.
Korotev R. L. (2013) Siderophile elements in brecciated lunar meteorites. 44th Lunar and Planetary Science Conference, abstract no. 1028.
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., Jolliff B. L., Zeigler R. A., Gillis J. J., and Haskin L. A. (2003) Feldspathic lunar meteorites and their implications for compositional remote sensing of the lunar surface and the composition of the lunar crust. Geochimica et Cosmochimica Acta 67, 4895-4923.
Lindstrom M. M., Schwarz C., Score R., and Mason B. (1991) MacAlpine Hills 88104 and 88105 lunar highland meteorites: General description and consortium overview. Geochimica et Cosmochimica Acta 55, 2999-3007.
Lindstrom M. M., Wentworth S. J., Martinez R. R., Mittlefehldt D. W., McKay D. S., Wang M.-s., and Lipschutz M. J. (1991) Geochemistry and petrography of the MacAlpine Hills lunar meteorites. Geochimica et Cosmochimica Acta 55, 3089-3103.
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 crust. Meteoritics & Planetary Science 45, 917-946.
McIntosh E. C., Day J. M. D., and Liu Y. (2018) Insights into impactor populations striking the moon from melt coat and regolith meteorite compositions. 49th Lunar and Planetary Science Conference, abstract no. 1022.
McIntosh E. C., Day J. M.D., Liu Y., and Jiskoot C. (2020) Examining the compositions of impactors striking the Moon using Apollo impact melt coats and anorthositic regolith breccia meteorites.
Neal C. R., L. A. Taylor, Y. Liu, and R. A. Schmitt (1991) Paired lunar meteorites MAC88104 and MAC88105: A new “FAN” of lunar petrology. Geochimica et Cosmochimica Acta 55, 3037-3049.
Nishiizumi K. (2003) Exposure histories of lunar meteorites. Evolution of Solar System Materials: A New Perspective from Antarctic Meteorites, 104.
Nishiizumi K., Arnold J. R., Klein J., Fink D., Middleton R., Kubik P. W., Sharma P., Elmore D., and Reedy R. C. (1991) Exposure histories of lunar meteorites: ALHA81005, MAC81004, MAC81005, and Y791197. Geochimica et Cosmochimica Acta 55, 3149-3155.
Nyquist L. E., Wiesmann H., Shih C.-Y., Dasch J. (1996) Lunar meteorites and the lunar crustal Sr and Nd isotopic compositions. Lunar and Planetary Science XXVII, 971-972.
Nyquist L. E., Bogard D. D., Shih C. Y., Wiesmann H. (2002) Negative εNd in anorthositic clasts in Yamato 86032 and MAC88105: Evidence for the LMO?. Lunar and Planetary Science XXXIII, abstract no. 1289.
Palme H., Spettel B., Jochum K. P., Dreibus G., Weber H., Weckwerth G., Wänke H., Bischoff A., and Stöffler D. (1991) Lunar highland meteorites and the composition of the lunar crust. Geochimica et Cosmochimica Acta 55, 3105-3122.
Robinson K. L. and Treiman A. H. (2010) Mare basalt fragments in lunar highlands meteorites: Connecting measured Ti abundances with orbital remote sensing. 41st Lunar and Planetary Science Conference, abstract no. 1788.
Robinson K. L., Treiman A. H., and Joy J. H. (2012) Basaltic fragments in lunar feldspathic meteorites: Connecting sample analyses to orbital remote sensing. Meteoritics & Planetary Science 43, 387-399.
Rochette P., Gattacceca J., Ivanov A. V., Nazarov M. A., and Bezaeva N. S. (2010) Magnetic properties of lunar materials: Meteorites, Luna and Apollo returned samples. Earth and Planetary Science Letters 292, 383-391.
Sears D. W. G., Benoit P. H., Sears H., Batchelor J. D., and Symes S. (1991) The natural thermoluminescence of meteorites: III. lunar and basaltic meteorites. Geochimica et Cosmochimica Acta 55, 3167-3180.
Semenova A. S., Nazarov M. A., Kononkova N. N., Patchen A., Taylor L. A. (2000) Mineral chemistry of lunar meteorite Dar al Gani 400. Lunar and Planetary Science XXXI, abstract no. 1252.
Takeda H., Saito J., Mori H., and Tachikawa O. (1990) Mineralogical comparisons of two large meteorites MAC88105 and Y86032. Lunar and Planetary Science XXI, 1233–1234.
Takeda H., Mori H., Saito J., and Miyamoto M. (1991) Mineral-chemical comparisons of MAC88105 with Yamato lunar meteorites. Geochimica Cosmochimica Acta 55, 3009–3018.
Taylor G. J. (1991) Impact melts in the MAC88105 lunar meteorite: Inferences for the lunar magma ocean hypothesis and the diversity of basaltic impact melts. Geochimica et Cosmochimica Acta 55, 3031-3036.
Vogt S., Fink D., Klein J., Middleton R., Dockhorn B., Korschinek G., Nolte E., and Herzog G. F. (1991) Exposure histories of the lunar meteorites: MAC88104, MAC88105, Y791197, and Y86032. Geochimica et Cosmochimica Acta 55, 3157-3165.
Warren P. H. and Kallemeyn G. W. (1991) The MacAlpine Hills lunar meteorite and implications of the lunar meteorites collectively for the composition and origin of the Moon. Geochimica et Cosmochimica Acta 55, 3123-3138.
Warren P. H. and Kallemeyn G. W. (1993) Geochemical investigations of two lunar mare meteorites: Yamato-793169 and Asuka-881757. Proceedings of the NIPR Symposium on Antarctic Meteorites 6, 35-57.
Wentworth S. J. and McKay D. S. (1990) Lunar meteorite MAC88104/5: Petrography and glass compositions. Lunar and Planetary Science XXI, 1323-1324.
Yanai K. and Kojima H. (1991) Varieties of lunar meteorites recovered from Antarctica. Proceedings of the NIPR Symposium on Antarctic Meteorites 4, 70-90.