OCCURRENCE AND PETROGENESIS OF LODA PAHAR TRONDHJEMITIC GNEISS FROM BUNDELKHAND CRATON, CENTRAL INDIA - REMNANT OF AN EARLY CRUST

The occurrence and the geochemistry of the typical high-Al trondhjemitic gneiss intruding into the highly deformed basic host rocks from Loda Pahar, Kabrai area, northeastern part of the Bundelkhand massif is reported. This large relict of the early crust is intruded by various phases of Proterozoic calc-alkaline granitoids. The highly fractionated REE pattern with HREE depletion and concave upward shape at the HREE end of the Loda Pahar trondhjemitic gneiss (LPTG), besides the major and trace element chemistry, is typical of Archaean TTG suites reported from shield areas of other continents. The evolution of such trondhjemitic magma is considered to have played a significant role during early crustal growth and the LPTG provides the first convincing evidence to qualify the Bundelkhand craton as a typical Archaean terrain.