ABYSSAL MINERAL ASSOCIATIONS IN DIKES AND KIMBERLITE PIPES OF PALEOZOIC ALKALINE PROVINCE OF BALTIC SHIELD

Chemical composition of xenocrysts and minerals in mantle nodula found in dikes and pipes of the Kola province and Fen area (SE Norway) was investigated. Estimation of PT conditions have proved the heterogeneit y of the mantle sources of dike magmatism, during Paleozoic tectonomag matic activity of the Baltic Shield. It is shown that the initial picr itic melts were generated at the depth of spinel Iherzolite facies (T = = 1000-degrees-C, P = 15 +/- 1 kbar), olivine melilitites are connec ted with magmatic process at the level of garnet - Iherzolite facies, and the deepest kimberlite melts were generated from the depth of diam ond - pyrope mantle facies (T = 1100-degrees-C, P > 40 kbar).