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Sunday, 26 June 2011

impact crater? (Dnieper-Donets Basin)

impact crater? (Dnieper-Donets Basin)

in "impact crater?" at
Robert wrote:

"Thought some of you might like this...
When I first saw the illustration from this article:
on the top of the page at 
I thought, 'nice cross section... which unexposed crater 
made the news?' I'd love to see some chip samples from 
near the center."

The USGS publication cited above is 

Klett, T. R., C. J. Schenk, R. R. Charpentier, M. E.  Brownfield, 
J. K. Pitman, R. M. Pollastro, T. A. Cook, and M. E. Tennyson,
2011, Assessment of Undiscovered Oil and Gas Resources 
of the Dnieper–Donets Basin Province and Pripyat Basin 
Province, Russia, Ukraine, and Belarus, 2010. World 
Petroleum Resources Project Fact Sheet 2011-3051.
United States Geological Survey, Reston, Virginia.

Looking at figure 1 of the above fact sheet, the Dnieper-
Donets Basin that is just less than 1400 kilometers long 
and about 200 to less than 100 kilometers wide. Its general
morphology alone argues against it being of impact origin.
The cross-section of Dnieper–Donets Basin shown in 
figure 2 of the above fact sheet is typical of numerous 
basins of terrestrial, non-impact origin. There nothing 
about it that argues for any sort of impact origin. 

The geology of the Dnieper-Donets Basin is well known
and very well documented. It is an intracratonic rift basin 
that opened in Late Devonian (middle Frasnian) as the 
result of the clockwise rotation of the Ukrainian shield
relative to other parts of the Russian craton. It is
characterized by linear bounding faults, substantial 
crustal thinning, syn-rift volcanic activity and other 
geological features that are typical of rift basins (Chekunov 
et al. 1992, 1993; Ilchenko 1996, Starostenko et al. 1999; 
Stephenson et al. 2006; Ulmishek 2001; Wilson and 
Lyashkevich 1996). There exists more than enough 
interpretations and data to demonstrate that the Dnieper-
Donets Basin cannot be any sort of impact crater.

References Cited:

Chekunov, A. V., V. K. Garvish, R. I. Kutas and L. I. Ryabchun,
1992, Dnieper-Donets palaeorift. Tectonophysics. vol. 208, 
no. 1-3, pp. 257-272.

Chekunov, A. V., L. T. Kaluzhnaya, and L. I., Ryabchun, 1993,
The Dnieper-Donets Paleorift, Ukraine: deep structure and
hydrocarbon accumulations. Journal of Petroleum Geology.
vol. 16, pp. 183-196.

Ilchenko, T., 1996, The Dniepr-Donets Rift: deep structure 
and evolution from DSS profiling. Tectonophysics. vol. 268, 
pp. 83-98.

Starostenko, V. I., V. A. Danilenko, D. B. Vengrovitch, R. I. Kutas, 
S. .M. Stovba, R. A. Stephenson, and O.M. Kharitonov, 1999,
A new geodynamical–thermal model of rift evolution, with 
application to the Dnieper–Donets Basin, Ukraine. Tectonophysics. 
vol. 313, pp. 29–40

Stephenson, R., T. Yegorova, M-F. Brunet, V. Starostenko, 
and S. Stovba, 2006, Late Palaeozoic (rift) basins of the East 
European Craton, in: R. A. Stephenson and D .G. Gee, eds, 
pp.3463-479, European Lithosphere Dynamics. Memoir 
no. 32, Geological Society of London, London, United Kingdom.

Ulmishek, G. F., 2001, Petroleum Geology and Resources 
of the Dnieper-Donets Basin, Ukraine and Russia. Bulletin
no. 2201, United States Geological Survey, Reston, Virginia.

Wilson, M., and Z. M. Lyashkevich, 1996. Magmatism and 
the geodynamics of rifting of the Pripyat-Dniepr-Donets 
rift, East European Platform. Tectonophysics. vol. 268, 
pp. 65-81.


Paul H.

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