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

Authors

Keywords:

gravity anomaly, East European Craton, magnetic anomaly, magnetotellurics, gravity modelling

Abstract

The Pomerania Gravity Low is a regular large-amplitude, oval-shaped anomaly of a disputable origin located at the East European Craton margin. In the past it was interpreted as a Proterozoic crustal keel or Early Paleozoic/Permian-Mesozoic depocenter. The origin of the anomaly has been reconsidered based on a reinterpretation of previous potential fields, seismic and magnetotelluric data and recent gravimetric modelling results. New alternative interpretations are proposed and discussed: felsic intrusion related to the Transscandinavian Igneous Belt and a large impact structure ca. 1.6-1.8 Ga old. In view of the presented data and regional comparisons the impact origin seems more probable. Nevertheless, a prolonged erosion, deep burial and metamorphic overprint hamper verification of this hypothesis, e.g. by finding impact ejecta or shock-affected minerals.

Downloads

Published

2024-04-25

Issue

Vol. 68 No. 1 (2024)

Section

Articles

License

Authors who publish with this journal agree to the following terms:
  1. Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
  2. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
  3. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as this can lead to productive exchanges and earlier and more frequent citation of the published work (See The Effect of Open Access).