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'''Dalgaranga crater''' is a small [[meteorite]] [[impact crater]] located on Dalgaranga pastoral station 75 km west of [[Mount Magnet, Western Australia|Mount Magnet]] (or north of [[Yalgoo, Western Australia|Yalgoo]] in [[Western Australia]]. It is only 24 m in diameter and 3 m deep, making it Australia's smallest impact crater (with exception of the smallest members of the [[Henbury crater|Henbury crater field]]).<ref name="Bevan_1996">Bevan A.W.R. 1996. Australian crater-forming meteorites. AGSO Journal of Australian Geology & Geophysics 16, 421–429.</ref> Though reputedly discovered much earlier, it was first reported in the scientific literature in 1938.<ref name="Simpson_1938">Simpson E.S. 1938. Some new and little known meteorites found in Western Australia. Mineralogical Magazine 25, 157–171.</ref> The bedrock at the site is weathered [[Archaean]] [[granite]] of the [[Yilgarn Craton]]. The discovery of fragments of [[mesosiderite]] stony-iron meteorite around the crater confirms an impact origin,<ref name="Nininger_1960">Nininger H.H. & Huss G.I. 1960. The unique meteorite crater at Dalgaranga, Western Australia. Mineralogical Magazine 32, 619–639.</ref> making this crater unique as the only one known to have been produced by a mesosiderite projectile. Asymmetries in the crater structure and the ejecta blanket imply that the projectile impacted at low angle from the south-southeast.<ref name="Shoemaker_etal_2005">Shoemaker E.M., Macdonald F. A. & Shoemaker C.S. 2005. Geology of five small Australian impact craters. Australian Journal of Earth Sciences 52, 529–544. [http://journalsonline.tandf.co.uk/link.asp?id=t2n7222127867711 Abstract]</ref> The age is not accurately constrained by must be young because it is so well preserved for its small size, and the meteorite fragments have not weathered away; some authors suggest an age of as young as 3000 years. |
'''Dalgaranga crater''' is a small [[meteorite]] [[impact crater]] located on Dalgaranga pastoral station 75 km west of [[Mount Magnet, Western Australia|Mount Magnet]] (or north of [[Yalgoo, Western Australia|Yalgoo]]) in [[Western Australia]]. It is only 24 m in diameter and 3 m deep, making it Australia's smallest impact crater (with exception of the smallest members of the [[Henbury crater|Henbury crater field]]).<ref name="Bevan_1996">Bevan A.W.R. 1996. Australian crater-forming meteorites. AGSO Journal of Australian Geology & Geophysics 16, 421–429.</ref> Though reputedly discovered much earlier, it was first reported in the scientific literature in 1938.<ref name="Simpson_1938">Simpson E.S. 1938. Some new and little known meteorites found in Western Australia. Mineralogical Magazine 25, 157–171.</ref> The bedrock at the site is weathered [[Archaean]] [[granite]] of the [[Yilgarn Craton]]. The discovery of fragments of [[mesosiderite]] stony-iron meteorite around the crater confirms an impact origin,<ref name="Nininger_1960">Nininger H.H. & Huss G.I. 1960. The unique meteorite crater at Dalgaranga, Western Australia. Mineralogical Magazine 32, 619–639.</ref> making this crater unique as the only one known to have been produced by a mesosiderite projectile. Asymmetries in the crater structure and the ejecta blanket imply that the projectile impacted at low angle from the south-southeast.<ref name="Shoemaker_etal_2005">Shoemaker E.M., Macdonald F. A. & Shoemaker C.S. 2005. Geology of five small Australian impact craters. Australian Journal of Earth Sciences 52, 529–544. [http://journalsonline.tandf.co.uk/link.asp?id=t2n7222127867711 Abstract]</ref> The age is not accurately constrained by must be young because it is so well preserved for its small size, and the meteorite fragments have not weathered away; some authors suggest an age of as young as 3000 years. |
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<ref name="Shoemaker_1988">Shoemaker E.M. & Shoemaker C.S. 1988. Impact structures of Australia (1987). Lunar and Planetary Science Conference XIX, 1079–1080. [http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1988LPI....19.1079S Abstract]</ref> |
<ref name="Shoemaker_1988">Shoemaker E.M. & Shoemaker C.S. 1988. Impact structures of Australia (1987). Lunar and Planetary Science Conference XIX, 1079–1080. [http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1988LPI....19.1079S Abstract]</ref> |
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Revision as of 12:06, 27 May 2007
Dalgaranga crater is a small meteorite impact crater located on Dalgaranga pastoral station 75 km west of Mount Magnet (or north of Yalgoo) in Western Australia. It is only 24 m in diameter and 3 m deep, making it Australia's smallest impact crater (with exception of the smallest members of the Henbury crater field).[1] Though reputedly discovered much earlier, it was first reported in the scientific literature in 1938.[2] The bedrock at the site is weathered Archaean granite of the Yilgarn Craton. The discovery of fragments of mesosiderite stony-iron meteorite around the crater confirms an impact origin,[3] making this crater unique as the only one known to have been produced by a mesosiderite projectile. Asymmetries in the crater structure and the ejecta blanket imply that the projectile impacted at low angle from the south-southeast.[4] The age is not accurately constrained by must be young because it is so well preserved for its small size, and the meteorite fragments have not weathered away; some authors suggest an age of as young as 3000 years. [5]
References
- ^ Bevan A.W.R. 1996. Australian crater-forming meteorites. AGSO Journal of Australian Geology & Geophysics 16, 421–429.
- ^ Simpson E.S. 1938. Some new and little known meteorites found in Western Australia. Mineralogical Magazine 25, 157–171.
- ^ Nininger H.H. & Huss G.I. 1960. The unique meteorite crater at Dalgaranga, Western Australia. Mineralogical Magazine 32, 619–639.
- ^ Shoemaker E.M., Macdonald F. A. & Shoemaker C.S. 2005. Geology of five small Australian impact craters. Australian Journal of Earth Sciences 52, 529–544. Abstract
- ^ Shoemaker E.M. & Shoemaker C.S. 1988. Impact structures of Australia (1987). Lunar and Planetary Science Conference XIX, 1079–1080. Abstract
External links
[1] Dalgaranga at Earth Impact Database, retrieved 23 March 2007.
27°38′S 117°17′E / 27.633°S 117.283°E
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