Complex of tectonic rifts in the White Sea
The White Sea Rift System is a complex of rifts manifested as numerous individual grabens located chiefly in the White Sea but including onshore areas and a strip of the Barents Sea. The rifts run in a subparallel manner from northwest to southeast where the rift system continues under the East European Platform. The system or complex originated due to extensional tectonics acting during the Middle to Late Riphean in the Proterozoic. This tectonic environment is believed to have been related to the break-up of the ancient supercontinent Palaeopangea. During the Riphean the graben structures were filled by Jotnian sediments. During the Middle Paleozoic the rift system was reactivated resulting in intrusion of alkaline magmas. In the Late Cenozoic the rift system was reactivated again resulting in the formation of the modern White Sea.
The White Sea Rift System includes the following rifts: 
Many of the grabens are filled with Jotnian sediments.
Notes.
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