Obolon' crater
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Obolon' crater is a 20 kilometre (12 mi) diameter buried meteorite impact crater situated about 200 km southeast of Kiev in Ukraine.[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] However, stratigraphic evidence has been cited to support an older age of 215 ± 25 Myr (Late Triassic), and if correct suggests that Obolon' may have been part of a hypothetical multiple impact event.[5]
[edit] References
- ^ Masaitis, V.L. Danilin, A.N., Karpov, G.M. and Raikhlin, A.I. (1976). "Karla, Obolon' and Rotmistrovka astroblemes in the European part of the USSR". Doklady Akademii Nauk SSSR, v. 230, pp. 174-177 (in Russian).
- ^ Val'ter, A.A., Gurov, E.P. and Ryabenko, V.A. (1977). "The Obolon' fossil meteorite crater astrobleme on the northeast flank of the Ukrainian Shield". Doklady Akademii Nauk SSSR, v. 232, pp. 170-173 (in Russian).
- ^ 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. Retrieved on 2007-02-18.
- ^ 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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