ELECTRON-MICROPROBE DATING OF MONAZITE FROM SPINEL GRANULITE IN THE EASTERN GHATS BELT, INDIA

Electron microprobe dating method is same as chemical aging method of TS-Th minerals used in geochronology. The Th-U-Pb concentrations obtai ned from a single electron probe analysis allow calculation of geologi cally meaningful age. Based on this method monazite from spinel granul ite of Visakhapatnam in the Eastern Ghats Belt (EGB) gave similar to 1 ,000 Ma, corroborating the late Proterozoic metamorphism and charnocki te emplacement, established in parts of the EGB and Antarctica. Microg eochronology of commonly occurring accessory mineral such as monazite in granulite variants is recommended for quick reconnaissance correlat ion in Gondwanian fragments in East Gondwanaland.