Petrology and geochemistry of granites in and around Chityala village, Nalgonda district, A.P., India

Granites of Chityala area which is located close to Hyderabad, have been selected for a systematic study. Petrographic studies on granites include modal analysis. These studies indicate that the original magmatic structures have been completely obliterated because of the onset of subsequent petrogenetic processes. Further, replacement structures and textural intergrowth of perthite and myrmekite are commonly observed. Seventeen representative granite samples were subjected to major elemental analysis and 6 samples have been analysed for trace elements. The data obtained is plotted in various binary and ternary diagrams and trends of the major oxides and trace elements is observed. Geochemical variation diagrams do not indicate any definite origin for the granites of the investigated area.