Several aspects of interpretation of geophysical data applied to the study of tectonics, geodynamics, metamorphism and magmatism are discussed. Examines the internal structure and development of mantle plumes, their metamorphic effects, major features of palingenic and anatectic granite formation and the anorthosite-rapakivi granite problem. The extent of megaintrusive emplacements is also evaluated, along with presentations of the tectonic and geodynamic roles of mantle plumes.