Abstract
Crystalline minerals in granite rocks has been quantatively analysed by powder X-ray diffraction (XRD) and Scanning Electron Microscope supported with Energy Dispersed Spectroscopy (SEM-EDS). SEM microphotograph reveals that rock is dominated by brightly illuminated quartz imbedded in the matrix with mica and other minor minerals. The X-ray mineral composition data have been plotted with SEM-EDS mineral composition, data shows that the composition obtained by two technique are in consistent within the experimental limit and in good agreement. Further plot of chemical composition of constituent oxides of granite sample by XRD and SEM-EDS confirm the consistency of two technique and similarity with Jharkhand mean granite composition. Silica composition have been plotted with trace element Pb, Ba, Zr, Rb, and Alumina composition with Pb , Ba, Zr and Rb shows that these elements are randomly imbedded in the matrix with almost uniform composition. Al2O 3 composition have been plotted with Ba, Pb, and Zr shows almost constant composition in all the five samples. Based on XRD and SEM-EDS results, it was reveals that granite sample from the study areas are peraluminius rocks composed of mainly quartz, muscovite, kaolinite, chlorite and albite.
Highlights
Abraham Werner gave the first definition of granite “Granite is an aggreagate rock which consist of Quatz, Fieldspar and Mica united each other in granular texture ( Middlemost 1986)
Deoghar Jharkhand granite were analysed by two different X-ray and Scanning Electron Microscope (SEM)-Energy Dispersive Spectroscopy (EDS) technique
Remarkable good agreement were found between X-ray diffraction (XRD) quantitative analysis and SEM –EDS analysis
Summary
Abraham Werner gave the first definition of granite “Granite is an aggreagate rock which consist of Quatz , Fieldspar and Mica united each other in granular texture ( Middlemost 1986). Granite rocks(Indian Mineral Year Book 2015) are produced from many quarries located throughout the Jharkhand for mixing and matching stone.Granites are coarse-grained rocks with a mottled appearance They comprise a mixture of glassy white, pink or red alkali feldspar, minor amounts of dark minerals, and often white, sodic plagioclase (Amral 2006). These rocks commonly display a pervasive amphibolite to high-temperature (HT) granulite facies overprint of the (U)HP mineral assemblages that was imposed during exhumation, yet the mechanism causing the warmer thermal regime remains unclear Geologists use it either in a restricted sense, or as a blanket term for granitoids of acid or intermediate composition (Klika 2016). This study with advance analytical instruments will be helpful in deciding the better and efficient applications granite rocks
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