Contiguous Laurentia and Baltica before the Grenvillian‐Sveconorwegian orogeny?

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Abstract
Close geochronological correspondence of Mesoproterozoic extension‐related magmatism and comparable tectonic and geochronological evolution of the Grenville and Svecononvegian orogens suggests that the Laurentian and Baltic Shields could have been joined during the Mesoproterozoic and did not separate until after the Grenvillian‐Sveconorwegian orogeny. The combined Grenville‐Svecononvegian orogen is here interpreted to have formed during the collision of coherent Laurentia‐Baltica with an unknown craton, which is in contrast to earlier explanations that favour a late‐Mesoproterozoic rotation between Laurentia and Baltica followed by collision of these two cratons with each other.