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.