LUMINESCENCE OF PLAGIOCLASES FROM GEOLOGICAL FORMATIONS OF PRECAMBRIAN STRUCTURAL ZONES WITH DIFFERENT GEODYNAMIC REGIMES (BY EXAMPLE OF THE STRUCTURES OF SIBERIAN PLATFORM AND BALTIC SHIELD)
X-ray luminescence (XL) and photoluminescence (PhL) properties were studied for plagioclases (Pl) from highly metamorphosed rocks and muscovite pegmatites occurring in six large-scale structural-tectonic zones of Siberian and East-European platforms. These structures relates to two geodynamic types: protoriftogenic troughs (including the greenstone belts) and the collision zone type (mobile belts). As a consequence, there are observed processes of petrogenesis sharply different by their characters and activity. Those processes are reflected in luminescence characteristics of rock-forming plagioclases. In relatively calm tectonic structures of the first type plagioclases are poor in admixture ions-luminogenes, first of all in Ce3+ and Eu2+, excluding the local activation zones. In collision zones, with general high-baric metamorphism, active granitization and the pegmatite-forming, plagioclases are characterized by the far higher intensity of XL and PhL, especially due to highly mobile Eu2+, Ce3+ and Mn2+, and in pegmatites also Pb2+. Intensity of the Pl luminescences was sharply increasing during the collision structures evolution. This may be explained by accumulation of luminogenes in plagioclases in processes of multiple activations of the structures, activations accompanied by a fluid-magmatic processing of rocks