Plate tectonic lecture - High grade gneiss terranes and ensialic zones.

High grade gneiss terranes:

General characteristics:

Minnesota River valley a good example.

Role of tectonic exhumation in their history?

One model for formation: deep crustal roots of an orogen that has undergone thickening, and partial melt segregation; i.e. highly reworked continental crust.

Ensialic zones:

Course materials for Plate Tectonics, GEOL 3700, University of Nebraska at Omaha. Instructor: H. D. Maher Jr., copyright. This material may be used for non-profit educational purposes with appropriate attribution of authorship. Otherwise please contact author.