Obolon' crater
| Obolon' crater | |
|---|---|
  Location of the crater in Ukraine | |
| 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 | 49°35′N 32°55′E / 49.583°N 32.917°E |
| 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
It has been suggested by
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]
References
- Doklady Akademii Nauk SSSR(in Russian). 230: 174–177.
- ^ Val'ter, A. A.; E. P. Gurov & V. A. Ryabenko (1977). "The Obolon' fossil meteorite crater astrobleme on the northeast flank of the Ukrainian Shield". Doklady Akademii Nauk SSSR (in Russian). 232: 170–173.
- ^ 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
- ^ "Obolon'". Earth Impact Database. Planetary and Space Science Centre University of New Brunswick Fredericton. Retrieved 2017-10-09.
- ^ 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
- ^ Steele, Diana (19 March 1998). "Crater chain points to impact of fragmented comet". University of Chicago Chronicle.
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