Tectonomagmatic activation

TECTONOMAGMATIC ACTIVATION (EN: tectonomagmatic activation; DE: tektonomagmatische Aktivisierung; FR: activation tectono-magmatique; ES: activacion tectono-magmatica; RU: активизация тектоно-магматическая) is the process of the increase of the intensity of the tectonic movements and magmatism, usually manifesting itself after the period of the relative tectonic quiescence. It is accompanied in some cases by the resumption of the mountain forming, the revival of the mountain relief on the place of the earlier plain territories. It is characterized by the fold-thrust tectonic deformations, by the rift forming, by the volcanism (usually (tholeiitic) alkaline-basaltic, rarely (calc-alkaline) calcareous-alkaline), by the forming of the fracture intrusions of the granites and alkaline rocks, less often by the repeated regional metamorphism.

The tectonomagmatic activation is explained by either the rise of the heated and lightweight material from the mantle to the base of the Earth crust, or by the collision of the continental lithospheric plates (for example, Hindustanic and Eurasian in the Central Asia) with the heating of their lower part. The phenomena of the tectonomagmatic activation occured over the significant length of the history of the Earth, at least since the early Proterozoic (2.5 billion years ago), but most clearly and fully since the Mesozoic. There is associated with the tectonomagmatic activation the forming of the numerous deposits of the non-ferrous metals (lead, zinc, tin, tungsten, and others), rare elements (tantalum, niobium, zirconium, thorium, and others), and precious stones.