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Lunar Meteorite

Allan Hills A81005

Allan Hills, Transantarctic Mountains, Antarctica

 

lm_a81005a.jpg

The meteorite has a partial greenish fusion crust.  It is somewhat vesicular, which is characteristic of fusion crusts on lunar regolith breccias. Regolith at the lunar surface contains implanted atoms of solar wind, mostly hydrogen and helium. This gas is released when the exterior of the stone melts as it passes through Earth’s atmosphere.

(from NASA photo S82-35869)

 

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Many clasts are visible on this broken face.  Like other lunar regolith breccias, but unlike many terrestrial sedimentary rocks, the clasts are unsorted - they come in a complete range of sizes.

(NASA photo)

 

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Another view of the meteorite.

(from NASA photo S83-34612)

 

 

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Lunar regolith breccias are fractal objects - regardless of the scale, they look similar.  This image is a photomicrograph of a thin section of a fragment of ALHA 81005.  The width of the fragment is ~3 mm, a factor-of-10 less than the width of broken face of the whole meteorite.

(photo credit: Randy Korotev)

 

 

Listed in The Meteoritical Bulletin, No. 76, Meteoritics 29, 100-143 (1994)

 

From Antarctic Meteorite Newsletter, Vol. 6, No. 1, February (1983) (PDF p. 11)

 

ALHA A81005

 

Antarctica

Found: 1982 January 18

Mass: 31.4 g

 

Classification: Anorthositic Breccia

 

Physical Description: Roberta Score. This is an unusual looking sample! Flow marks are apparent on the exterior which is covered with a pitted, glassy, greenish-tan colored crust. Immediately underneath this crust, the surface is a "dusty" gray color. The interior consists of abundant angular clasts, which range in color from gray to white, set in a black matrix. The size of the clasts are as small as submillimeter and as large as 8 mm in diameter. The sample is very coherent. Some areas of oxidation were noted. Dimensions: 3 x 2.5 x 3 cm.

 

Petrographic Description: Brian Mason. The specimen is a microbreccia of clasts (maximum dimension 4 mm) in a translucent to semi-opaque dark brown glassy matrix showing flow structure in places; clast:matrix ratio is approximately 40:60. The larger clasts are polymineralic, the smaller (less than 0.3 mm) may be individual mineral grains. The clasts consist largely of plagioclase, together with some pyroxene and occasional olivine; most of the mineral grains are plagioclase. The clasts show a variety of textures, including gabbroic, diabasic, and basaltic; many have been shocked and partly granulated. Some of the clasts resemble eucrites, but many appear to be more feldspathic than most eucrites. The section is notable for the complete absence of opaque minerals, except for a 1 mm metal grain. Microprobe analyses show that the plagioclase is very Ca-rich, averaging An97 (range An95-98); pyroxene is variable in composition, Wo1-41, En44-79, Fs7-47 (richer in En than most eucrite pyroxenes); several grains of olivine, Fa11-40, were analyzed. The meteorite is a breccia, but more feldspathic than most eucrites; some of the clasts resemble the anorthositic clasts described from lunar rocks.

 

More Information

 

Meteoritical Bulletin Database

 

Allan Hills A81005

 

Lunar Meteorite Compendium

 

Allan Hills A81005

 

Map

 

ANSMET Location Map

 

References

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Bogard D. D. and Johnson P. (1983) Trapped solar gases in the ALHA81005 lunar(?) meteorite (abstract). In Lunar and Planetary Science XIV, p. 55-56.

Bogard D. D. and Johnson P. (1983) Trapped noble gases indicate lunar origin for Antarctic meteorite, Geophysical Research Letters 10, 801-803.

Boynton W. V. and Hill D. H. (1983) Minor and trace elements in clast and whole rock samples of Allan Hills A81005 (abstract). In Lunar and Planetary Science XIV, Abstracts from the Session on Meteorites from Earth's Moon, p. 3-4.

Boynton W. V. and Hill D. H. (1983) Composition of bulk fragments and a possible pristine clast from Allan Hills A81005, Geophysical Research Letters 10, 837-840.

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Chen J. H. and Wasserburg G. J. (1985) U-Th isotopic studies on meteorite ALHA81005 and Ibitira (abstract). 14th Lunar and Planetary Science Conference, 119–120.

Delano J. W. (1990) Constraints on the highlands source-area of lunar meteorite ALHA 81005 using chemical compositions of glasses (abstract). In Lunar and Planetary Science XXI, p. 276–277.

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.

Desnoyers C. and Michel-Lévy M. C.(1983) The olivine in the lunar meteorite ALHA 81005 (abstract). In Meteoritics 18, 290.

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Isaacson P. J., Liu Y., Patchen A. D., Pieters C. M., and Taylor L. A. (2010) Spectroscopy of lunar meteorites as constraints for ground truth: Expanded sample collection diversity (abstract). In Lunar and Planetary Science XLI, abstract no. 1927.

Isaacson P. J., Hiroi T., Hawke B. R., Lucey P. G., Pieters C. M., Liu Y., Patchen A., and Taylor L. A. (2013) Lunar meteorite geo-logic context: New constraints from VNIR spectroscopy and geochemistry (abstract). In 44th Lunar and Planetary Science Conference, abstract no. 1134.

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Jull A. J. T. and Donahue, D. J. (1992) 14C Terrestrial ages of two lunar meteorites, ALHA 81005 and EET 87521 (abstract). Lunar and Planetary Science XXIII, p. 637–638.

Kallemeyn G. W. (1983) ALHA81005: A new sample from the lunar highlands? (abstract). In Lunar and Planetary Science XIV, p. 361-362.

Kallemeyn G. W. and Warren P. H. (1983) Compositional implications regarding the lunar origin of the ALHA81005 meteorite, Geophysical Research Letters 10, 833-836.

Korotev R. L. (2005) Lunar geochemistry as told by lunar meteorites. Chemie 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., Haskin L. A. , and Lindstrom M. M. (1983) Lunar highlands breccia 81005 (ALHA): So Apollo 18 flew, but where did it sample? (abstract). In Lunar and Planetary Science XIV, Abstracts from the Session on Meteorites from Earth's Moon, p. 12-13.

Korotev R. L., Lindstrom M. M., Lindstrom D. J., and Haskin L. A. (1983) Antarctic meteorite ALHA81005 - Not just another lunar anorthositic norite, Geophysical Research Letters 10, 829-832.

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.

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Laul J. C., Smith M. R., and Schmitt R. A. (1983) ALHA 81005 meteorite: Chemical evidence for lunar Highland origin (abstract). In Lunar and Planetary Science XIV, Abstracts from the Session on Meteorites from Earth's Moon, p. 16-17.

Laul J. C., Smith M. R., and Schmitt R. A. (1983) ALHA 81005 meteorite: Chemical evidence for lunar highland origin, Geophysical Research Letters 10, 825-828.

Maloy A. K., Treiman A. H., and Shearer C. K. Jr. (2004) A ferroan gabbronorite clast in lunar meteorite ALHA81005: Major and trace element composition, and origin (abstract). In Lunar and Planetary Science XXXV, abstract no. 1159.

Maloy A. K., Treiman A. H., Shearer C. K. Jr. (2005) A magnesian granulite clast in lunar meteorite ALHA81005 (abstract). 68th Annual Meeting of the Meteoritical Society, number 5278.

Maloy A. K. and Treiman A. H. (2007) Magnesian anorthositic clasts in lunar meteorites ALHA 81005 and Dho 039: Bulk compositions and regional significance (abstract). 70th Annual Meeting of the Meteoritical Society, number 5109.

Marvin U. B. (1983) Some petrologic comparisons between ALHA81005 and lunar highland soil breccias (abstract). In Lunar and Planetary Science XIV, Abstracts from the Session on Meteorites from Earth's Moon, p. 18-19.

Marvin U. B. (1983) The discovery and initial characterization of Allan Hills 81005: The first lunar meteorite, Geophysical Research Letters 10, 775-778.

Mayeda T. K. and Clayton R. N. (1983) Oxygen isotopic composition of ALHA 81005 (abstract). In Lunar and Planetary Science XIV, p. 472.

Mayeda T. K., Clayton R. N., and Molini-Velsko C. A. (1983) Oxygen and silicon isotopes in ALHA 81005, Geophysical Research Letters 10, 799-800.

Morris R. V. (1983) Ferromagnetic resonance and magnetic properties of ALHA81005. Geophysical Research Letters 10, 807-808.

Nishiizumi K. (2003) Exposure histories of lunar meteorites (abstract). In Evolution of Solar System Materials: A New Perspective from Antarctic Meteorites, p. 104, National Institute of Polar Research, Tokyo.

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.

Ostertag R. and Ryder G. (1983) ALHA 81005: Petrography, shock, Moon, Mars, Giordano Bruno, and composition (abstract). In Lunar and Planetary Science XIV, Abstracts from the Session on Meteorites from Earth's Moon, p. 23-24.

Palme H., Spettel B., Weckwerth G., and Wänke H. (1983) (abstract). In Lunar and Planetary Science XIV, Abstracts from the Session on Meteorites from Earth's Moon, p. 25-26.

Palme H., Spettel B., Weckwerth G., and Wänke H. (1983) Antarctic meteorite ALHA 81005, a piece from the ancient lunar crust, Geophysical Research Letters 10, 817-820.

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Pieters C. M. (1983) If ALHA81005 came from the Moon, can we tell from where? (abstract). In Lunar and Planetary Science XIV, Abstracts from the Session on Meteorites from Earth's Moon, p. 27-28.

Pieters C. M., Hawke B. R., Gaffey M., and McFadden L. A. (1983) Possible lunar source areas of meteorite ALHA81005: Geochemical remote sensing information. Geophysical Research Letters 10, 813-816.

Rahilly K. E. and Treiman A. H. (2009) Granulite clasts of intermediate Mg* in lunar meteorite ALHA 81005: Chemical compositions and origins (abstract). In Lunar and Planetary Science XL, abstract no. 1168, 40th Lunar and Planetary Science Conference, Houston.

Rao A. S. P. (1986) Origin of ALHA 81005: Another view (abstract). In Meteoritics 21, 488–489.

Robinson K. L. and Treiman A. H. (2010) Mare basalt fragments in lunar highlands meteorites: Connecting measured Ti abundances with orbital remote sensing (abstract). In Lunar and Planetary Science XLI, abstract no. 1788, 41st Lunar and Planetary Science Conference, Houston.

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.

Robinson K. L., Barnes J. J., Tartèse R., Hallis L. J., Franchi I. A., Anand M., and Taylor G. J. (2014) Apatite in Allan Hills 81005 and the origin of water in the lunar magma ocean (abstract). 45th Lunar and Planetary Science Conference, abstract no. 2413.

Ryder G. (1983) Glass in ALHA 81005,8 and mare basalts in highlands breccias (abstract). In Meteoritics 18, 390–391.

Ryder G. and Ostertag R. (1983) ALHA 81005: Petrographic components of the target (abstract). In Lunar and Planetary Science XIV, Abstracts from the Session on Meteorites from Earth's Moon, p. 29-30.

Ryder G. and Ostertag R. (1983) ALHA 81005: Moon, Mars, petrography, and Giordano Bruno, Geophysical Research Letters 10, 791-794.

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Simon S. B., Papike J. J., and Shearer C. K. (1983) Petrology and mineral chemistry of ALHA 81005 (abstract). In Lunar and Planetary Science XIV, Abstracts from the Session on Meteorites from Earth's Moon, p. 31-32.

Simon S. B., Papike J. J., and Shearer C. K. (1983) Petrology of ALHA81005, the first lunar meteorite, Geophysical Research Letters 10, 787-790.

Sutton S. R. (1986) Thermoluminescence of lunar meteorites Yamato-791197 and ALHA-81005. Proceedings of the Tenth Symposium on Antarctic Meteorites, 1985. Memoirs of the National Institute of Polar Research, Special Issue 41, 133–139.

Sutton S. R. and Crozaz G. (1983) Thermoluminescence and tracks in ALHA-81005: Constraints on the history of this unusual meteorite (abstract). In Lunar and Planetary Science XIV, Abstracts from the Session on Meteorites from Earth's Moon, p. 33-34.

Sutton S. R. and Crozaz G. (1983) Thermoluminescence and nuclear particle tracks in ALHA 81005: Evidence for a brief transit time, Geophysical Research Letters 10, 809-812.

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Treiman A. H. and Drake M. J. (1983) Meteorite from the moon: Petrology of terrae clasts and one mare clast in ALHA 81005,9 (abstract). In Lunar and Planetary Science XIV, Abstracts from the Session on Meteorites from Earth's Moon, p. 35-36.

Treiman A. H. and Drake M. J. (1983) Origin of lunar meteorite ALHA81005: Clues from the presence of terrae clasts and a very low-titanium mare basalt clast, Geophysical Research Letters 10, 783-786.

Treiman A. H. and Gross J. (2013) Basalt related to lunar Mg-suite plutonic rocks: A fragment in lunar meteorite ALH 81005 (abstract). 76th Annual Meeting of the Meteoritical Society, abstract no. 5183.

Treiman A. H., Maloy A. K., and Shearer C. K. Jr. (2008) Magnesian anorthositic granulite: An abundant, significant, and poorly understood lunar rock type of the lunar highlands (abstract). NLSI Lunar Science Conference, LPI Contribution No. 1415, abstract no. 2112. Lunar and Planetary Institute, Houston.

Treiman A. H., Maloy A. K., Shearer C. K. Jr., and Gross J. (2010) Magnesian anorthositic granulites in lunar meteorites Allan Hills A81005 and Dhofar 309: Geochemistry and global significance. Meteoritics & Planetary Science 45, 163–180.

Tuniz C., Pal D. K., Moniot R. K., Savin W., Kruse T. H., Herzog G. F., and Evans J. C. (1983) Recent cosmic ray exposure history of ALHA 81005 (abstract). In Lunar and Planetary Science XIV, Abstracts from the Session on Meteorites from Earth's Moon, p. 37-38.

Tuniz C., Pal D. K., Moniot R. K., Savin W., Kruse T. H., Herzog G. F., and Evans J. C. (1983) Recent cosmic ray exposure history of ALHA 81005, Geophysical Research Letters 10, 804-806.

Verkouteren R. M., Dennison J. E., and Lipschutz M. E. (1983) Siderophile, lithophile and volatile trace elements in Allan Hills A81005 (abstract). In Lunar and Planetary Science XIV, Abstracts from the Session on Meteorites from Earth's Moon, p. 39-40.

Verkouteren R. M., Dennison J. E., and Lipschutz M. E. (1983) Siderophile, lithophile and mobile trace elements in the lunar meteorite Allan Hills 81005, Geophysical Research Letters 10, 821-824.

Warren P. H. and Kallemeyn G. W. (1986) Geochemistry of lunar meteorite Yamato-791197: Comparison with ALHA81005 and other lunar samples. Proceedings of the Tenth Symposium on Antarctic Meteorites, 1985. Memoirs of the National Institute of Polar Research Special Issue 41, 3-16.  

Warren P. H. and Kallemeyn G. W. (1987) Geochemistry of lunar meteorite Yamato-82192: Comparison with Yamato-791197, ALHA81005, and other lunar samples. Proceedings of the Eleventh Symposium on Antarctic Meteorites, 1986. Memoirs of the National Institute of Polar Research, Special Issue 46, 3-20. 

Warren P. H. and Kallemeyn G. W. (1991) Geochemical investigations of five lunar meteorites: Implications for the composition, origin and evolution of the lunar crust. Proceedings of the NIPR Symposium on Antarctic Meteorites 4, 91-117. Nat. Inst. Polar Res., Tokyo.

Warren P. H., Taylor G. J., Keil K. (1983) Regolith breccia ALHA 81005: Evidence of lunar origin, and nature of pristine and nonpristine clasts (abstract). In Lunar and Planetary Science XIV, p. 828-829.

Warren P. H., Taylor G. J., Keil K. (1983) ALHA 81005: a meteorite from the moon -- But can we rule out Mercury? (abstract). In Lunar and Planetary Science XIV, Abstracts from the Session on Meteorites from Earth's Moon, p. 41-42.

Warren P. H., Taylor G. J., Keil K. (1983) Regolith breccia Allan Hills A81005: Evidence of lunar origin and petrography of pristine and nonpristine clasts, Geophysical Research Letters 10, 779-782.

Warren P. H., Jerde E. A., and Kallemeyn G. W. (1989) Lunar meteorites: siderophile element contents, and implications for the composition and origin of the Moon. Earth and Planetary Science Letters 91, 245-260.

Yanai K. and Kojima H. (1991) Varieties of lunar meteorites recovered from Antarctica. Proceedings of the NIPR Symposium on Antarctic Meteorites 4, 70-90.

 

 

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Prepared by
: Randy L. Korotev
 
Department of Earth and Planetary Sciences
Washington University in St. Louis

Please don't contact me about the meteorite you think you've found until you read this and this.


e-mail
korotev@wustl.edu

Last revised: 6-Oct-2015