Timing the break-up of the Baltica and Laurentia connection in Nuna – Rapid plate motion oscillation and plate tectonics in the Mesoproterozoic

Meso– to Neoproterozoic geological and paleomagnetic data support a direct connection between Baltica Laurentia in both Nuna Rodinia supercontinents, however different relative configurations. Previous limit the time of break-up core configuration ca. 90° rotation 1.27 Ga 0.99 Ga. Despite well documented motion continents, tectonic mode during has been questioned operation single lid tectonics at 1.6–1.0 Nuna-Rodinia supercontinent cycles proposed. In this study, new whole rock 40Ar-39Ar geochronological from basic dyke Stugun central Sweden are combined with coeval produce 1.22 (1.244–1.200 Ga) moderate-quality pole. This is done better estimate explore plate Mesoproterozoic. The pole fills part 1.247–1.140 gap record Baltica. By comparing apparent polar wander paths (APWPs) calculated drift velocities, 1.12–1.04 suggested. Plate velocities for Laurentia, Siberia supercycle similar low moderately high corresponding present-day speeds. Furthermore, obtained velocity peaks may be related onset supercontinent, Baltica–Laurentia nascent Rodinia. We suggest that large oscillating shifts late Mesoproterozoic positions result combination inertial interchange true (IITPW) events. Both IITPW events motions argue an Neoproterozoic.