Astronomy:Multi-ringed basin
A multi-ringed basin (also a multi-ring impact basin) is not a simple bowl-shaped crater, or a peak ring crater, but one containing multiple concentric topographic rings;[1] a multi-ringed basin could be described as a massive impact crater, surrounded by circular chains of mountains[2] resembling rings on a bull's-eye. A multi-ringed basin may have an area of many thousands of square kilometres.[3]
An impact crater of diameter bigger than about 180 miles (290 km) is referred to as a basin.[4]
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The structure of multi-ring basins
In adjacent rings, the ratio of the diameters approximates √2:1 ≈ 1.41 to 1.[5][6][7]
Formation
To start, a peak ring crater has
- one peak-ring, i.e., a crater rim, which is generally circular, and
- a mountainous region which surrounds the basin center.
A multi-ringed basin has an important difference, which is multiple peak-rings.
In extremely large collisions, following the impact the rebound of the surface can obliterate any trace of the initial impact point. Usually a peak ring crater has a high structure with a terrace, and has slump structures inside of it. In 2016, research brought forward new theories about the lunar mare called Mare Orientale on Earth's Moon, as to how it formed.[8]
Multi-ring basins are some of the largest, oldest, rarest and least understood of impact craters. There are various theories to explain the formation of multi-ringed basins, however there is currently no consensus.[9][10]
Examples
- Mare Orientale on Earth's Moon is a multi-ringed basin created by an impactor perhaps 60 kilometres (40 mi) in diameter traveling at 14 kilometres per second (9 mi/s), or about 52,100 kilometres per hour (32,400 mph)[11]
- Anubis on Ganymede, the largest moon of Jupiter
- Valhalla on Callisto, a moon of Jupiter
- Evander on Dione, a moon of Saturn
- Caloris Basin, surrounded by Caloris Montes, on Mercury
Chicxulub crater in Mexico has a sufficient area to have been a multi-ringed basin,[12]
See also
- Astronomy:Complex crater – Large impact craters with uplifted centres
- Astronomy:Impact crater – Circular depression in a solid astronomical body formed by the impact of a smaller object
- Astronomy:Impact event – Collision of two astronomical objects
- Astronomy:Peak ring (crater) – Roughly circular ring or plateau, possibly discontinuous, surrounding an impact crater's center
- Astronomy:Pedestal crater
- Astronomy:Expanded crater
- Astronomy:Traces of Catastrophe book from Lunar and Planetary Institute - comprehensive reference on impact crater science
References
- ↑ Head, J. W. (January 2010). "Transition from complex craters to multi-ringed basins on terrestrial planetary bodies: Scale-dependent role of the expanding melt cavity and progressive interaction with the displaced zone". Geophysical Research Letters 37 (2): L02203. doi:10.1029/2009GL041790. Bibcode: 2010GeoRL..37.2203H. http://www.planetary.brown.edu/pdfs/3925.pdf. Retrieved 2019-01-19.
- ↑ "Lunar Landforms Teacher Page". Hawai'i Space Grant Consortium, Hawai'i Institute of Geophysics and Planetology, University of Hawai'i. 1998. http://www.spacegrant.hawaii.edu/class_acts/LunarLandformsTe.html. Retrieved 18 January 2019.
- ↑ "Encyclopedia Britannica". Encyclopedia Britannica. February 1, 2018. https://www.britannica.com/science/multiringed-basin. Retrieved January 20, 2019.
- ↑ [(url is hijacked by suspicious site) "How Multi-Ring Craters Form Revealed by New Research"]. Ideas, Inventions And Innovations. October 29, 2016. (url is hijacked by suspicious site). Retrieved January 20, 2019.
- ↑ "Multi-Ring Basin". Encyclopedia.com. https://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/multi-ring-basin. Retrieved January 20, 2019.
- ↑ Moons & Planets, William K. Hartmann, 2005, p.255ff
- ↑ Martellato, Elena (January 31, 2011). The importance of being a crater: A tool in planetary surface analysis and datation (PDF) (PhD Thesis). Università degli Studi di Padova. Retrieved January 20, 2019.
- ↑ Stacey, Kevin (October 27, 2016). "Research helps explain formation of ringed crater on the Moon". News from Brown. https://news.brown.edu/articles/2016/10/orientale. Retrieved 20 January 2019.
- ↑ Potter, Ross W.K. (November 2015). "Investigating the onset of multi-ring impact basin formation". Icarus 261: 91–99. doi:10.1016/j.icarus.2015.08.009. Bibcode: 2015Icar..261...91P. https://pdfs.semanticscholar.org/c456/ee3092a5296496ef70158baa9987314c44dd.pdf.
- ↑ Stuart Ross Taylor (1982). "Meteorite impacts, craters and multi-ring basins". Planetary Science: A Lunar Perspective. Lunar and Planetary Institute. https://www.lpi.usra.edu/publications/books/planetary_science/chapter3.pdf. Retrieved 19 January 2019.
- ↑ Chu, Jennifer (October 27, 2016). "Retracing the origins of a massive, multi-ring crater". MIT News. https://news.mit.edu/2016/retracing-origins-massive-multi-ring-crater-moon-1027. Retrieved 20 January 2019.
- ↑ McKinnon, W. B.; Alexopoulos, J. S. (January 1994). "Some implications of large impact craters and basins on Venus for terrestrial ringed craters and planetary evolution". KT Event and Other Catastrophes.
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