The Pomerania Gravity Low at the East European Craton margin – a granitic batholith or a Paleoproterozoic impact structure?

Abstract

As so ci ate Ed i tor: Jacek Szczepañski The Pomerania Grav ity Low is a reg u lar large-am pli tude, oval anom aly of dis put able or i gin lo cated at the East Eu ro pean Craton mar gin. In the past it has been in ter preted as a Pro tero zoic crustal keel or an Early Pa leo zoic/Perm ian-Me so zoic depocentre. The or i gin of the anom aly has been re con sid ered based on a re in ter pre ta tion of pre vi ous po ten tial fields, seismic and magnetotelluric data and re cent gravimetric mod el ling re sults. New al ter na tive in ter pre ta tions are pro posed and discussed, namely a fel sic in tru sion re lated to the Transscandinavian Ig ne ous Belt and a large im pact struc ture dat ing to ~1.6-1.8 Ga. The data as sem bled, to gether with re gional com par i sons, make the im pact or i gin seem more prob a ble. Nev erthe less, pro longed ero sion, deep burial and a meta mor phic over print ham per test ing of this hy poth e sis, e.g., through find ing im pact ejecta or shock-af fected min er als.