Petrographic, mineralogical and microstructural studies in the mafic dyke occurred in the area of Mettur, Salem District, Tamil Nadu, India

A mafic dyke is a mass of rock generated in either sedimentary or igneous terrain and intrudes pre-existing cracks. It was common to see many enormous swarms the southern granulitic landscape made up archean rocks. Dykes tend be younger than surrounding body. Generally, dolerite has an ophitic texture medium fine grained. In study area country rocks petrographical microscope, XRD, FE-SEM techniques were analysed. Plagioclase feldspar, augite, biotite, hornblende, quartz minerals presented Alternating wedges, augite/labradorite grain boundaries are shown microstructure as white rectangle. Two augite wedges observed with rounded ends. The mineral percentage rich because its intergrowth low cooling temperature pressure. So, magma crystallized rapidly on surface thus, crystallizing low. Thus, shows high quartz. quartz-dolerite.