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Tectonics and Stratigraphy of the Gurgunta Schist Belt of the Dharwar Craton, South India
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The early Archaean oval-Shaped, high-Grade Gurgunta schist belt in the northern part of the eastern Dharwar craton of south India constitutes a part of the intensely deformed magmatized basement of the low-Grade volcano-Sedimentary sequence of the Dharwar craton. The Gurgunta schist belt consists of two blocks of a migmatised volcano-Sedimentary sequence separated by an E-W trending shear zone. Contrary to the earlier interpretations, the regional structure of the belt is not a dome.
The earliest episode of deformation (D1) has produced pervasive planar fabric in metavolcanics and in granitoid rocks after migmatisation of volcano-Sedimentary rocks in its early history D2 has produced major and minor isoclinal folds along with axial planar pervasive gneissic banding while the D3 has produced major and minor tight to isoclinal folds on foliation. The map pattern is controlled by D3 deformation D4 and D5 are of mild intensity and less prominent on a regional scale in comparison to earlier deformations.
The grade of metamorphism, migmatisation, the structural history and the presence of E-W trending shear zone suggest that the belt is probably older than the low-Grade supracrustal belts in the adjoining areas.
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