Structural History of Sargur Supracrustals and Associated Gneisses, Southwest of Mysore, Karnataka

Results of structural investigations in Sargur schist complex around Sargur, Dodkanya and Gundlupet indicate four major fold episodes and associated fault movements. These episodes have resulted in the formation of antiform-synform structures(F₂), extensive interleaving and dome-basin patterns (F₂ and F₃). Tectono-metamorphic studies have brought out the polymetamorphic (with late retrogressive) and polydeformational nature of the terrain. At least two migmatization events and (anatectic) granitic intrusions (associated with F₂ and F₃) have been recognised. A classification of gneisses of the area has been made and reasons and criteria for the recognition of 'Kabini gneiss' are given.

The tectonic relations between the Sargurs, Dharwars and 'Khondalite-Char- nockites', point to structural continuity of the Sargur terrain with the 'Khondalite-Charnockite' terrain to its south.