Satellite picture of the Richat Structure
By NASA/GSFC/MITI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team – http://asterweb.jpl.nasa.gov/gallery-detail.asp?name=Richat, Public Domain, https://commons.wikimedia.org/w/index.php?curid=2974815
It was at first believed to be an impact crater. However, it does not have the kinetic shock related features associated with such craters. Instead, it has features indicating that it was produced by an even application of pressure across its 50 km diameter.
Current thinking is that it is a collapsed dome. Hot water or magma produced a circular hill which subsequently collapsed into the concentric circular structure we see today.
The thinking is that since it was not produced by a concentrated blast at the center, it must have been produced through a swelling, followed by a collapse. The possibility that an incoming meteorite may have produced an evenly distributed pressure wave does not appear to have been considered.
Any electrical considerations have almost certainly been ignored since current mainstream cosmology does not take electromagnetic forces into account when dealing with meteorites.
However, the Richat Structure has all the characteristics of an electrical event. It displays the tell tale twist of a Birkeland Current.
The structure may well be the result of a meteorite that exploded differently than normal. Instead of a pin point explosion, the object may have produced a sheet of lightning.
This would have been an extremely powerful lightning event. It may have lifted the top soil off the entire 50 km diameter area. The subsequent explosion of the meteorite would have blown the top soil to the side.
Being produced by a sheet lightning, rather than a concentrated flash, the explosion is likely to have produced a more evenly distributed pressure wave.
Such a sheet lightning would also have produced a lot of gamma rays and positrons, which is the sort of stuff required for transmutations of elements.
Electricity, heat and evenly distributed pressure would have produce electrolytic effects. Gamma rays and positrons may well have produced rare elements and isotopes as well. An unusual chemistry would be the expected result of such a cocktail of chemical and nuclear processes.