The Phanerozoic fold set of indicators of high-pressure changes crustal substrate are metamorphogenic eclogites, whose appearance is a sign of subduction-collision mechanisms of formation of the crust. The lack of Archean eclogites was a serious argument against the action of plate tectonics in the Archean. Found Archaean eclogite in the White Sea mobile belt (BPP) in Gridino tectonic m?lange zone (North Karelia) and on the Kola Peninsula and the proof of their Precambrian geochronology isotope methods are of great interest because of their importance to the reconstruction of the Archaean geodynamics.
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