Obolon' crater
| Obolon' crater | |
|---|---|
| Lua error in Module:Location_map at line 411: Malformed coordinates value. | |
| Impact crater/structure | |
| Confidence | Confirmed |
| Diameter | 20 km (12 mi) |
| Age | 169 ± 7 Ma Middle Jurassic |
| Exposed | No |
| Drilled | Yes |
| Bolide type | Iron meteorite? |
| Location | |
| Coordinates | Lua error in Module:Coordinates at line 489: attempt to index field 'wikibase' (a nil value). |
| Country | Ukraine |
| State | Poltava |
Obolon' crater (Ukrainian: Оболонь) is a 20 km (12 mi) diameter buried meteorite impact crater situated about 200 km (120 mi) southeast of Kyiv in Ukraine (Poltava Oblast).[1][2] The site has been drilled, which revealed the presence of shocked minerals and impact melt rock; the high chlorine content of the latter suggesting that the area was covered by shallow sea at the time of impact.[3] One estimate puts the age at 169 ± 7 million years (Middle Jurassic).[4]
Hypothetical multiple impact event
[edit | edit source]It has been suggested by Geophysicist David Rowley of the University of Chicago, working with John Spray of the University of New Brunswick and Simon Kelley of the Open University, that Obolon' may have been part of a hypothetical multiple impact event which also formed the Manicouagan impact structure in northern Quebec, Rochechouart impact structure in France, Saint Martin crater in Manitoba, and Red Wing crater in North Dakota.[5] All of the craters had previously been known and studied, but their paleoalignment had never before been demonstrated. Rowley has said that the likelihood that these craters could be aligned like this due to chance is nearly zero.[6] However, more recent work has found that the craters formed many millions of years apart, with the Saint Martin crater dating to 227.8 ± 1.1 Ma,[7] while the Rochechouart structure formed 206.92 ± 0.20/0.32 Ma.[8]
References
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- ^ Gurov E.P., Gurova E.P. (1995). "Impact melt composition of the Obolon crater: chlorine as a possible indicator of the submarine crater formation". Meteoritics, v. 30, p 515. Abstract
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Spray, J.G., Kelley, S.P. and Rowley, D.B. (1998). "Evidence for a late Triassic multiple impact event on Earth". Nature, v. 392, pp. 171–173. Abstract
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