Evolution of stress fields in the Por’ya Guba dike field (Kandalaksha Gulf, White Sea) |
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Authors: | T I Vasil’eva E S Przhiyalgovskii |
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Institution: | (1) Geological Institute (GIN), Russian Academy of Sciences, Pyzhevskii per. 7, Moscow, 119017, Russia |
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Abstract: | The tectonic evolution of the Por’ya Guba segment of the White Sea Rift System began in the late Paleoproterozoic, i.e., soon
after completion of the Svecofennian collision. The fracture system that controlled localization of the lamproite dike complex
was formed under conditions of horizontal compression combined with shear. Subsequently, this system predetermined the location
of a rift-graben segment that formed as a result of simple shear. The reactivation of the rift system in the Middle Paleozoic
proceeded in two stages. The first stage, when strike-slip movements along previously formed faults predominated, resulted
in formation of quartz-carbonate veins bearing base-metal mineralization. The veins that filled the shear fractures opened
owing to local reorientation of the stress field. The second stage fitted the transtension conditions, and the Late Devonian
alkaline ultramafic dikes of this stage introded into the already existing fracture system, which was oriented at a roughly
right angle to the predominant stress orientation. |
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