The Belomorian mobile belt is defined as the belt of high-grade metamorphic rocks, made up predominantly of Meso- to Neoarchean tonalite-trondhjemite granodiorite (TTG) gneisses with numerous blocks of strongly retrogressed eclogites (retro-eclogite) sealed inside them. We highlight that the genesis of the Belomorian mobile belt was triggered by a far-field stress resulting in emergence of the fore-bulge belt during the development of the Lapland-Kola compressional orogeny and the related flexure of the Archean lithosphere. This led to ~10 % shortening of the Archean lithosphere, culminating both in significant enhancement of the dislocation creep rate in its crustal level and compactionderived fluid activity. The tectonic pressure was maximal in the North-Belomorian syntax area, which contains an overwhelming majority of eclogite blocks sealed in the Meso- to Neoarchean TTG gneisses.