Dehydroxylation of Minerals of Gadisunkapur Area with Special Reference to FTIR and Thermal Study

Abstract

This paper attempts to explain the presence of OH group for micas along with some sulfate, chlorite, quartz
and feldspar minerals. These minerals are found to be associated with barite vein, metasediments (quartz-chlorite
schist), metarhyolite and varieties of granitic rocks of Gadisunkapur area of Hungund-Kushtagi Schist belt. The
samples were collected in and around Gadisunkapur village of Bagalkote district, Karnataka and further processed to
determine OH group anion in different minerals present based on FTIR and Thermal studies such as
Thermogravimetric analysis (TGA) and Differential Thermal analysis (DTA). The high temperature dehydroxylation is
investigated using this analysis. Furthermore, present study indicates the presence of different extra species (CO2,
CO32- and OH-). The results show the incorporation of CO2 into the structures due to heating or enhanced by the
dehydroxylation process.

Keywords: FTIR, TGA, DTA, OH group, Gadisunkapur, Hungund-Kushtagi schist belt.