Camel Donga meteorite, Dundas Shire, Western Australia, Australia
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|Latitude & Longitude (WGS84):||30° 19' South , 126° 37' East|
|Latitude & Longitude (decimal):||-30.31667,126.61667|
|Non-native locality type:||Meteorite|
|Meteorite Class:||Eucrite monomict breccia meteorite|
|Meteoritical Society Class:||Eucrite-mmict|
|Metbull:||View entry in Meteoritical Bulletin Database|
|Köppen climate type:||BWh : Hot deserts climate|
1984 Find, ~25 kg
A two-day trip in July 1985 by Brian Mason and W. H. Cleverly to the site of a January 1984 find resulted in 11 additional stones within a kilometer of each other providing a total recovered mass of 2.92 kilograms. The stones were often covered by black fusion crusts, but weathering is quite evident in these and other subsequently recovered stones. The meteorite is composed almost entirely of pyroxene and plagioclase (~3:2 ratio) as angular grains and in matrix. The matrix which also contains quite minor amounts of iron, troilite, ilmenite, and various silica polymorphs. Gabbroic and doleritic clasts are present as well. Pyroxene is mildly Fe-rich; plagioclase is mostly bytownite; iron (Ni-free) accounts for ~2% of the stone. Small amounts of zircon and baddeleyite are also present. These refractory minerals have been especially helpful in leading to additional refinements in establishing a chronology for Camel Donga's journey from its formation on a large, differentiated meteorite (presumably Vesta) until its eventual landfall. Recent iterations of isotopic studies have suggested that almost all of Camel Donga's constituents were formed ~4.56 billion years ago — and that a particular violent impact event ~3.7 billion years ago may represent the ejection of Camel Donga (and its lithological neighbors…) from the original homeworld. After that event, chance, circumstance, more collisions, and gravity lead to its quite recent final collision with the earth [chronological references below].
Notes [Aug 2008)]: Cleverly et al., (1986) provide an excellent review of both the recovery and the overall mineralgy of Camel. Camel Donga is the 5th most massive of the 802 Eucrites listed on the Meteoritical Society's 'Meteoritical Bulletin Database.' All pieces of the original 1984 eucrite find are referred to simply as (pieces of) Camel Donga. A number of separate finds in the same area have been designated Camel Donga 002 thru Camel Donga 053.
11 valid minerals.
Meteorite/Rock Types Recorded
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Graham, A. L. Editor (1986). Meteoritical Bulletin. Meteoritics 21 (3): 309-313 (Sept 1986).
Cleverly, W. H., Jarosewich, E. & Mason, B. (1986) Camel Donga meteorite - A new eucrite from the Nullarbor Plain, Western Australia: Meteoritics 21 (3); 263-269. ( Sept 1986)
Palme, H., Wlotzka, F. & Spettel, B. (1988) Camel Donga, a Eucrite with High Metal Content: Meteoritics 21(4): 481-482. (Dec 1988)
Michel, T. & Eugster, O. (1994) Primitive xenon in diogenites and plutonium-244-fission xenon ages of a diogenite, a howardite, and eucrites: Meteoritics 29 (5): 593-606. (Sept 1994)
Grady, M. M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge, New York, Oakleigh, Madrid, Cape Town. 690 pages.
Chennaoui Aoudjehane, H. & Jambon, A. (2007) Determination of Silica Polymorphs in Eucrites by Cathodoluminescence: Lunar and Planetary Science XXXVIII. LPI Contribution No. 1338, pdf.#1714. (March 2007)
Zhou, Q. et al. (2013) SIMS Pb-Pb and U-Pb age determination of eucrite zircons at < 5 μm scale and the first 50 Ma of the thermal history of Vesta. Geochimica et Cosmochimica Acta, Volume 110, p. 152-175. (June 2013)
Kennedy, T., Jourdan, F., Bevan, A. W. R., Mary Gee, M. A. & Frew, A. (2013) Impact history of the HED parent body(ies) clarified by new 40Ar/39Ar analyses of four HED meteorites and one anomalous basaltic achondrite: Geochimica et Cosmochimica Acta 115: 162-182. (August 2013)
Hsu, W., Wang, L. & Zhang, A. (Sept 2013) SIMS Dating of Eucritic Zircons: 76th Annual Meeting of the Meteoritical Society. Published in Meteoritics and Planetary Science Supplement, id.5022. (Sept 2013)