Petrology of the amphibolites of the Tanaelv belt and granulites of the Lapland complex

The paper deals with the petrology of metamorphosed basic rocks from the dy namometamorphic Tanaelv belt bordering the Lapland granulite complex on the south and west. Microtextural, mineralogical, and thermodynamic parameters suggest that amphibolites enclosing the granulite complex experienced adve ction, i.e., a single-stage circulation in the Earth's crust. It was promot ed by the upwelling of a granulite diapir. Chemical zoning and reaction rel ationships between minerals in the rocks of the diapir allowed us to recons truct decompression and isobaric trends of rock evolution and determine the mechanism of their exhumation. It corresponds to the model of the gravitat ional redistribution of rocks in the Earth's crust under the influence of a mantle plume.