Abstract
Signs of shock metamorphism in rocks and minerals of the layered Jarva-varaka massif and the host rocks are described. The massif is located in the Monchegorsk ore district of the Kola region. Signs of the impact genesis of the massif include pseudotachylite breccia, “kink-banding” structures in biotite and clinozoisite, planar deformations in quartz, diaplectic glasses of zircon, sillimanite, and plagioclase, and deformation microstructures in monazite. The totality of available features allows us to assume the impact origin of the Jarva-Varaka massif ca. 2.5 Ga ago.
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Schedule a callMore From: Proceedings of the Karelian Research Centre of the Russian Academy of Sciences
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