LITHIUM AND TUNGSTEN MINERALIZATION IN SEWARIYA PLUTON, SOUTH DELHI FOLD BELT, RAJASTHAN - EVIDENCES FOR PREFERENTIAL HOST ROCK AFFINITY

'Sewariya batholith', the largest of Erinpura granite intrusions in the South Delhi Fold Belt is evolved from a two-stage subduction process. The Sewariya granitoids comprise three major mineralogical varieties, viz, hornblende-biotite granite, biotite granite and leucogranite. The hornblende-biotite granite is a deep-level I-type granite, whereas the other two are orogenic, S-type anatectic granites formed by partial melting of the same source material under varying physicochemical conditions, These two granite types also host the tungsten and lithium mineralization, The W and Li minerals show perfect separation and host rock discrimination, The W minerals are associated with biotite granite, whereas the leucogranite hosts the Li mineralization,