Sill genesis in the Paleoproterozoic tectonic evolution of the Onega Trough,Baltic shield |
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| Authors: | A V Poleshchuk |
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| Institution: | 1.Geological Institute,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | This study considers the role of sill genesis in the tectonic evolution of the Onega Trough during the Middle to Late Paleoproterozoic
(Jatulian-Vepsian). The evolution of the Onega Trough is divided into three stages: pre-sill, or preparatory, subsynchronous,
and post-sill. Sill magmatism manifested itself most completely at the subsynchronous stage of the evolution of the Onega
Trough within the initial, principal, and final phases of sill genesis. Sill formation followed the stage of regional downwarping
of the area reaching its maximum during the Early Ludicovian. Paragenesis of sills and high carbon shungite rocks was accompanied
by the formation of peperites, while sills influenced the structure of the host rocks. A model reflecting the regular patterns
of manifestations of sill genesis identified in the Onega Trough has been proposed. |
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