Authors: Dhananjay M.1, Tejas K.2, Sunil S K.3, Jithendra S.4
Abstract: Melukotelying in 12°40’05” N 76°38’07” Ein Pandavapura taluk of Mandya district, Karnataka, in southern India isgeologically aGranitic and Mylonitic terrain. Karnataka being on hard rock terrain called Dharwar Carton, it has been further divided into Eastern Dharwar and Western Dharwar the eastern Dharwar being the youngest of two they have been sheared against each other forming Chitradurga schist belt a metamorphic terrain. In general the basement rock is Sargur schist belt 3.1 Ga old (billion years) overlain by Peninsular gneiss 2.9 Ga old (billion years) they have been over laying by younger Granitic rocks which is around 2.1 Ga old(billion years). This shows that the rocks are old and hard rocks and laying in Seismic ZoneII by BIS i.e. Bureau of Indian Standards. The even though they are hard rock terrains they have undergone structural deformations. Different structural features such as folds different sizes, faults different sizes, shears zones of different sizes running from micro shears of less than a meter to mega shears that run for hundreds of kilometers have been identified at different places. Hence the basic knowledge of this says that where ever we move around in Karnataka that would be on hard rocks of any of this kind. That is until and unless we encounter a mineralized terrain or structural feature the construction planning and execution would not be affected by the soft rocks or sedimentary rocks except a few basins such as Bhīma and Kaladgi Basin.
Coming to the geology of Melkote the place is known for huge hillocks or outcrops in geological sense and the have been recognized of extension of Bukapatna Granite of Chitradurga. The place is mylonictic terrain.Myloniteisanindicator of intense structural deformations such as faults, folds and shear zones. Hence the prime objective of Civil Engineer in the field is to identify the structural plains and then pre analyze the effect of the same on the civil structure that would be planed for. The rocks have undergone physical, chemical, biological, weathering. Chemical weathering processes are among the most fundamental natural processes operating at and near the surfaces of earth.
Keywords: Granitic, Mylonitic, Sargur schist belt, peninsular gneiss and Mylonite.
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