Dalgaranga crater
| Dalgaranga crater | |
|---|---|
Yilgarn craton | |
| Coordinates | 27°38′6″S 117°17′20″E / 27.63500°S 117.28889°E |
| Country | Australia |
| State | Western Australia |
  Location of the crater in Western Australia | |
Dalgaranga crater is a small
Henbury crater field).[1][2] Though discovered in 1921, it was not reported in the scientific literature until 1938.[3] 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,[4] making this crater unique as the only one known to have been produced by a mesosiderite projectile.[5]
Description
Asymmetries in the crater structure and the ejecta blanket imply that the projectile impacted at low angle from the south-southeast.[6] The age is not accurately constrained but 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.[7]
Discovery
The crater was discovered by an
Aboriginal stockman named Billy Seward in 1921. The meteorites were found shortly after by Gerard Wellard, the station manager, when Seward took him to the site. It was not until 1923 that meteorite fragments were sent to the Western Australian Museum.[8][9]
References
- ^ "Dalgaranga". Earth Impact Database. Planetary and Space Science Centre University of New Brunswick Fredericton. Retrieved 19 August 2009.
- 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.
- .
- ^ Bevan, A; Griffin, Brendan (1994), Re-examination of the Murchison Downs meteorite: a fragment of the Dalgaranga mesosiderite, retrieved 5 November 2017
- S2CID 130096764.
- ^ Shoemaker E.M. & Shoemaker C.S. 1988. Impact structures of Australia (1987). Lunar and Planetary Science Conference XIX, 1079–1080. Abstract
- ^ Wellard, G.E.P. (1983). Bushlore: or this and that from here and there. Perth: Artlook. pp. 95–97.
- S2CID 119249953.
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