Аннотация:Thermobarometric data and fluid inclusions data of conditions of interaction between mafic xenolithes
(granulites) and plagiogranites in the Lotta river area, Lapland Granulite Belt, confirm the conclusion that leucocratic
garnet-bearing plagiogranites of the Lapland complex are associated with the anatexis of country khondalites during
peak of metamorphism. The formation of these magmas occurred at depths of 25-30 km. During ascent, granitic
magmas trapped mafic (two pyroxene-plagioclase) xenoliths at pressures 6.0-6.4 kbar. The interaction of predominantly
aqueous-salt fluids issued by the magmas with the xenoliths during cooling at depths less than 20 km (5.0-5.5 kbar) led
to their widespread amphibolization at temperatures of 740-780°C.
Key words: Lapland Granulite Belt, the River Lotta Area, plagiogranites, granulite, mafic xenolithsn,
thermobarometric data, fluid inclusions, amphibolization.
Mineral and end-member abbreviations: Ab – albite, Amph – amphibole, An – anorthite, Cherm – chermakite, Cpx-
clinopyroxene, Ed – edenite, Ilm – ilmenite, Mt – magnetite, Opx– orthopyroxene, Pl – plagioclase, Parg – pargasite,
Qtz – quartz, Tre – tremolite.