Shoemaker impact structure
Shoemaker impact structure | |
---|---|
Teague Ring | |
Impact crater/structure | |
Confidence | Confirmed |
Diameter | minimum 30 km (19 mi) |
Age | 1630 ± 5 Ma (contested, see text) Proterozoic |
Exposed | Yes |
Drilled | No |
Location | |
Coordinates | 25°52′S 120°53′E / 25.867°S 120.883°E |
Country | Australia |
State | Western Australia |
District | Mid West |
Shoemaker (formerly known as Teague Ring) is an
Description
The prominent ring-like topographic feature, easily seen in satellite images, lies on the boundary between the
The first suggestion that the ring-like topographic feature may be an impact structure was published in 1974.[3] Subsequent research revealed definitive evidence for this hypothesis, including the presence of shatter cones and shocked quartz.[4][5][6] The feature has a central circular region of uplifted Archaean Granite (Teague Granite) about 12 km (7.5 mi) in diameter, surrounded by a downwarped ring (ring syncline) of sedimentary rocks with an outer limit of disturbance at about 30 km (19 mi) diameter, which is a minimum estimate of the size of the original crater.[5]
The age of the impact event is uncertain. It must be younger than the
See also
- Geology of Western Australia
- List of impact craters in Australia
References
- ^ "Shoemaker". Earth Impact Database. Planetary and Space Science Centre University of New Brunswick Fredericton. Retrieved 2017-10-09.
- ^ Pirajno F. & Glikson A.Y. 1998. Shoemaker impact structure Western Australia (formerly Teague ring structure). Celestial Mechanics and Dynamical Astronomy 69, 25–30.
- ^ Butler H. 1974. The Lake Teague ring structure, Western Australia: an astrobleme? Search 5, 536–537.
- ^ a b Bunting J.A., De Laeter J.R. & Libby W.G. 1980. Evidence for the age and cryptoexplosive origin of the Teague Ring structure, Western Australia. Geological Survey of Western Australia, Annual Review 1980, 81–85. GSWA download search Archived 2009-07-13 at the Wayback Machine
- ^ a b c d e Pirajno F., Hawke P., Glikson A.Y., Haines P.W. & Uysal T. 2003. Shoemaker impact structure, Western Australia. Australian Journal of Earth Sciences 50, 775–796. Abstract
- ^ Shoemaker E.M. & Shoemaker C.S. 1996. The Proterozoic impact record of Australia. AGSO Journal of Australian Geology and Geophysics 16, 379-398.
- ^ Pirajno F. 2002. Geology of the Shoemaker impact structure. Geological Survey of Western Australia Report 82. GSWA download search Archived 2009-07-13 at the Wayback Machine