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Allan Hills A77307 meteorite (ALHA77307), Allan Hills, Victoria Land, Eastern Antarctica, Antarctica

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Latitude & Longitude (WGS84): 76° 43' South , 159° 40' East
Latitude & Longitude (decimal): -76.71667,159.66667
Other regions containing this locality:Antarctic Meteorites
Non-native locality type:Meteorite
Meteorite Class:CO3.0 chondrite meteorite
Meteoritical Society Class: CO3.0
Metbull:View entry in Meteoritical Bulletin Database
Köppen climate type:EF : Ice cap climate

Carbonaceous Chondrite, Ornans-like (CO3.0; S1)
1977 Find, 181.3 g

Allan Hills A77307 (ALHA77307), classified as a CO3.0 (Ornans-like) Carbonaceous Chondrite, is a small and somewhat weathered stone largely covered by a black fusion crust. ALHA77307 is one of only 7 known members of the very primitive type CO3.0 Chondrites as of early Jul7 2015. The meteorite consists mostly of small chondrules rich in forsteritic olivine and enstatite-rich pyroxenes. Small amounts of metal (kamacite, taenite tetrataenite) are present but limonite stains and some magnetite grains give clear indications of significant weathering of some portions of the meteorite. The matrix which accounts for nearly 50% of the meteorite is extremely fine-grained and is genetically related to the chondrule population. However, within the matrix are various exotic components which include unusually early hibonite and corundum (believed to be among the very earliest condensates of the ancient solar nebula) as well as a large number of very tiny presolar diamond, graphite, silicates, oxides, and silicon carbide grains. The presolar phases are usually revealed by their isotopic anomalies and are, unfortunately, only partially characterized mineralogically.

Most other CO3.0 chondrites are larger than ALHA77307, but ALHA77307 was apparently the first to be recognized as a CO3.0 and has consequently received quite a bit of attention for such a modest-sized stone.

Nota Bene: ALHA77307 may be referred to as 'Allan Hills 77307' or 'ALH 77307'. These usages reflect simpler conventions adopted after the meteorite had been formally named.

Mineral List

26 valid minerals.

Meteorite/Rock Types Recorded

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Brian Mason (1978) Antarctic Meteorite Data Sheet, ALHA77397: Antarctic Meteorite Newsletter 1 (3):p.31. (Nov 1978)

Nagahara, H. & Kushiro, I. (1982a) Genetic Relation of Chondrules, Inclusions and Isolated Olivines in ALH-77307 (CO3) Chondrite (Abstract): Lunar and Planetary Science XIII: 562-563. (March 1982)

Nagahara, H. & Kushiro, I. (1982b) Petrology of chondrules, inclusions and isolated olivine grains in ALH-77307 (CO3) chondrite. Symposium on Antarctic Meteorites, 7th: Tokyo, Japan, Feb. 19, 20, 1982 National Institute of Polar Research, Memoirs, Special Issue , no. 25:66-67. (Dec 1982).

Grossman, J. N. - Editor (1994). The Meteoritical Bulletin, No. 76. Meteoritics, 29 (1): 100-143. (Jan 1994).

Twentieth Symposium on Antarctic Meteorites. Proceedings of the NIPR Symposium, No. 9, held June 6-8, 1995, at the National Institute of Polar Research, Tokyo. Editor in Chief, Hideyasu Kojima, with Naoya Imae, Makoto Kimura, Akira Shimoyama, Nobuo Takaoka. Published by the National Institute of Polar Research, 1996, p.79

Shibata, Y. (1996) Opaque minerals in Antarctic CO3 carbonaceous chondrites, Yamato-74135 -790992, -791717, -81020, -81025, -82050 and Allan Hills-77307: Twentieth Symposium on Antarctic Meteorites: Proceedings of the NIPR Symposium, No. 9 [Editor in Chief, Hideyasu Kojima]: pp. 79-93-108. (1996).

Brearley, A. J. & Jones, R. H. (1998). Chondritic Meteorites. In: Planetary Materials (Papike, J. J., Editor): Chapter 3, 398 pages. Mineralogical Society of America: Washington, DC, USA. (1998)

Monica M. Grady (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge, New York, Oakleigh, Madrid, Cape Town. 690 pages.

Huss, G. R., Meshik, A. P., Smith, J. B. & Hohenberg, C. M. (2003) Presolar diamond, silicon carbide, and graphite in carbonaceous chondrites: Implications for thermal processing in the solar nebula: Geochimica et Cosmochimica Acta, vol. 67, no. 24: pp. 4823-4848. (Dec 2003).

Huss, G. R., Rubin A.E. & Grossman J. N. (2006) Thermal Morphism in Chondrites. IN: Meteorites and the Early Solar System II (Lauretta, D. S. & McSween Jr, H. Y.[editors]: pp. 567-586. University of Arizona Press: Tucson.

Brearley, A. J. (2006) The Action of Water. IN: Meteorites and the Early Solar System II (Lauretta, D. S. & McSween Jr, H. Y.[editors]: pp. 587-624. University of Arizona Press: Tucson.

Nguyen, A. N., Nittler, L. R., Stadermann, F. J., Stroud, R. M. & Alexander, C. M. O'D. (2010). Coordinated Analyses of Presolar Grains in the Allan Hills 77307 and Queen Elizabeth Range 99177 Meteorites: The Astrophysical Journal 719 (1): 166-189. (Aug 2010).

Han, J. & Brearley, A. J. (2011) Formation of TiO2 Nanoparticles in a CAI-Like Object from an AOA in the ALHA 77307 CO3.0 Carbonaceous Chondrite. 74th Annual Meeting of the Meteoritical Society, held August 8-12, 2011 in London, UK. Published in Meteoritics and Planetary Science Supplement, id.5190. (Sept 2011)

Han, J. & Brearley, A. J. (2011) Evidence for Formation of Al-Ti Pyroxene by Reaction Between Perovskite and Melilite in a CAI-Like Object from an AOA in the ALHA 77307 CO3.0 Chondrite. 74th Annual Meeting of the Meteoritical Society, held August 8-12, 2011 in London, UK. Published in Meteoritics and Planetary Science Supplement, id.5388. (Sept 2011)

Needham, A. W. & Messenger, S. (2103) Corundum-Hibonite Inclusions and the Environments of High Temperature Processing in the Early Solar System: Lunar and Planetary Science Conference XLIV. LPI Contribution No. 1719, p.2929. (March 2013).

Han, J. & Brearley, A. J. (2012) The Microstructure and Microchemistry of Amoeboid Olivine Aggregates from the ALHA 77307 CO3.0 Carbonaceous Chondrite: Constraints on Formation and Thermal Histories: 43rd Lunar and Planetary Science Conference. LPI Contribution No. 1659, id.1323. (Mar 2012)

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