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Elephant Moraine 83309 meteorite (EET 83309), Elephant Moraine, Victoria Land, Eastern Antarctica, Antarctica

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Latitude & Longitude (WGS84): 76° 18' 51'' South , 157° 13' 10'' East
Latitude & Longitude (decimal): -76.31444,157.21972
Other regions containing this locality:Antarctic Meteorites
Non-native locality type:Meteorite
Meteorite Type:Ureilite-pmict meteorite
Köppen climate type:EF : Ice cap climate


Ureilite, polymict (ureil-pm)
Find, 1983; 60.8 g, weathered

Elephant Moraine 83309 (EET 83309) is a small, very weathered meteoritic stone which had retained a small portion of its fusion crust when recovered. The interior — quite brecciated — is compositionally dominated by olivine clasts (≤3mm), lesser amounts of pigeonite, a few plagioclase clasts, small graphite-rich regions, and the distinctive ureilite oxygen isotope signatures. Iron oxide veins and stains have largely replaced most of the metal and sulfides which were once present. But EET 83309 is no ordinary ureilite as it was the first of the 'polymict ureilites' to be recognized. In addition to the olivine, graphite, and pigeonite found in almost all ureilites, the polymict ureilites are characterized by a multitude of clasts and inclusions which contain additional pyroxenes (e.g., augite, enstatite, orthopyroxene), plagioclase (missing from most ureilites), unusual nitrogen isotopes, and other inclusions. The entire suite of minerals found in the polymict ureilites is not easily characterized as they appear to be derived from diverse sources (a putative ureilite parent body (UPB), several ureilite parent bodies?, and elsewhere). Polymict ureilites have generated intense interest, however, because it is thought that their mineralogical diversity may provide vital clues as to why the the ureilites possess both (1) 'cumulate' mineral suites believed to require moderately large parent bodies and (2) isotopic signatures usually interpreted as characteristic of small bodies from within the ancient solar nebula.

Polymict ureilites represent slightly more than 5% of the ureilite population. While the theoretical implications of the polymict subgroup remain a work in progress, their mineralogical diversity can be appreciated 'as is.' Two other polymict ureilites with Mindat sites are the North Haig, Australia find (1961) and the Dar al Gani 319, Libya find (1997).

Mineral List


16 valid minerals.

Meteorite/Rock Types Recorded

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This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Prinz, M., Weisberg, M. K., Nehru, C. E. & Delaney, J. S. (1987) EET 83309, A Polymict Ureilite: Recognition of a New Group: Abstracts of the Lunar and Planetary Science Conference XVIII: 802-803. (Mar 1987).

Grady, M. M. & Carl T. Pillinger, C. T. (1987) Unusual nitrogen isotope composition of polymict ureilites: Meteoritics 22(4): 394-395. (Dec 1987).

Warren, P. H. & Kallemeyn, G. W. (1989) Geochemistry of polymict ureilite EET83309, and a partially-disruptive impact model for ureilite origin: Meteoritics 24 (4):233-246. (Dec 1989).

Ott, U., Löhr, H. P. & Begemann, F. (1990) EET 83309: A ureilite with solar noble gases. Meteoritics 25(4): p. 396. (Dec 1990).

Mittlefehldt, D. W., McCoy, T. J., Goodrich, C. A. & Kracher, A. (1998). Non-chondritic meteorites from asteroidal bodies. In: Planetary Materials (Papike, J. J., Editor): Chapter 4, 195 pages. Mineralogical Society of America: Washington, DC, USA. (1998)

Guan, Y. & Crozaz, G. (2001) Microdistributions and petrogenetic implications of rare earth elements in polymict ureilites: Meteoritics & Planetary Science 36( 8): 1039-1056. (Aug 2001).

Herrin, J. S., Mittlefehldt, D. W., Downes, H. & Humayun, M. (2007) Diverse Metals and Sulfides in Polymict Ureilites EET 83309 and EET 87720: Lunar and Planetary Science XXXVIII. LPI Contribution No. 1338, p.2404. (March 2007).

Downes, H., Mittlefehldt, D.W., Hita, N.T. & Valley J.W. (2008) Evidence from polymict ureilites for a disrupted and re-accreted single parent body gardened by several distinct impactors: Geochimica et Cosmochimica Acta 72 (19): 4825 -4844. (1 Oct 2008).

Beard, A. D., Downes, H. & Howard, K. (2009) Hydrated Silica (Opal) in a Polymict Ureilite, EET 83309: Meteoritics & Planetary Science 44 (7, Supplement): page. A31. (Sept 2009).

Downes, H., Beard, A. D. & Howard, K. (2009) Petrology of a Granitic Clast in Polymict Ureilite EET 83309: Meteoritics & Planetary Science 44 (7, Supplement): page A63. (Sept 2009).

Grady, M. M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.

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