Obolon' crater

{{Infobox terrestrial impact site

| name = Obolon' crater

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| map = Ukraine

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| map_caption = Location of the crater in Ukraine

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| coordinates = {{coord|49|35|N|32|55|E|region:UA-53_type:landmark_scale:150000|display=inline,title}}

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| confidence = Confirmed

| diameter = {{convert|20|km|mi|abbr=on}}

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| age = 169 ± 7 Ma
Middle Jurassic

| exposed = No

| drilled = Yes

| bolide = Iron meteorite?

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| country = Ukraine

| state = Poltava

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Obolon' crater ({{langx|uk|Оболонь}}) is a {{convert|20|km|mi|abbr=on}} diameter buried meteorite impact crater situated about {{convert|200|km|mi|abbr=on}} southeast of Kyiv in Ukraine (Poltava Oblast).{{cite journal| last=Masaitis | first=V. L. | author2=A. N. Danilin | author3=G. M. Karpov | author4=A. I. Raikhlin | name-list-style=amp | date=1976 | title=Karla, Obolon' and Rotmistrovka astroblemes in the European part of the USSR | language=ru | journal=Doklady Akademii Nauk SSSR | volume=230 | pages=174–177}}{{cite journal| last=Val'ter | first=A. A. | author2=E. P. Gurov | author3=V. A. Ryabenko | name-list-style=amp | date=1977 | title=The Obolon' fossil meteorite crater astrobleme on the northeast flank of the Ukrainian Shield | language=ru | journal=Doklady Akademii Nauk SSSR | volume=232 | pages=170–173}}

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.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. [http://adsabs.harvard.edu/abs/1995Metic..30R.515G Abstract]

One estimate puts the age at 169 ± 7 million years (Middle Jurassic).{{cite Earth Impact DB |name=Obolon' |linkname=obolon |access-date=2017-10-09}}

Hypothetical multiple impact event

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.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. [http://www.nature.com/nature/journal/v392/n6672/abs/392171a0.html Abstract] 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.{{Cite news | last = Steele | first = Diana | title = Crater chain points to impact of fragmented comet | newspaper = University of Chicago Chronicle | date = 19 March 1998 | url = http://chronicle.uchicago.edu/980319/craters.shtml }}

References

{{reflist}}{{Portal|Geology|Ukraine

}}{{Impact cratering on Earth}}

Category:Impact craters of Ukraine

Category:Jurassic impact craters

Category:Geography of Poltava Oblast