A Geo-illustration Studies of Nagamangala, Mayasandra, Yediyur area of Chitradurga Schist belt, Dharwar Craton, Southern India

Basavaraj Hatti, Sharath Kumar P

Abstract


In recent times the Precambrian shields of the world have became nerve centers of global research aimed mainly at decipher the early history of the Earth. Various agencies like the Geological Survey of India (GSI), Ministry of Mines (MoM), Ministry of Earth Sciences (MoES), research institutes and universities of not only India but from the other countries also are involved in this task. As such the craton portion of Karnataka has been gaining lot of importance in recent years on account of its unique geo-illustration. The present study area covers southern extensions of the Chitradurga schist belt, which includes the parts of Nagamangala, Mayasandra and Yadiyur schist belts and associated gneissic terrain with enclaves of mafic and ultramafic rocks exposed around Nagamangala town. Both the Nagamangala and Mayasandra schist belts are correlated to the Sargur Group (> 3400 my) while the Yadiyur schist belt to Dharwar Super Group. The present area is better suited for above mentioned studies as in this area the various litho units belonging to two stratigraphic units are well exposed and lie almost side by side. The present study of the area around the parts of Nagamangala, Mayasandra and Yadiyur dykes of Chitradurga schist belts of Dharwar Craton and is situated in Mandya and Tumkur district of Karnataka State. Sampling has been done so as to include all the noted variations in the field characters and to have a good geographic coverage. Satellite imagery has helped in picking up a number of major and minor lineaments cutting across the schist belts and gneisses. The geological map produced here has been prepared on the basis of the detailed observations in the field using Geoinformatics tools. The representative samples have been examined using geological microscope and the rocks have been classified on the basis of their mineral assemblages and textural features. The extensive igneous activity undergone by the study area is represented by the numerous dykes. A detailed geological characterization of the environs in the Nagamangala, Mayasandra and Yadiyur area on the basis of field observations has tried to give not only an unified illustration of the geology of the area but also has commented on the possible modes of advancement of the different necessary components like topography, climate, rainfall, drainage, soil and lithology of the study area.

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References


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