Geochemistry and Petrography of U-Th-Y Mineralisation in Alkali Feldspar Granite (Alaskite) Dykes around Dhanota, Mahendragarh District, Haryana, India

Radioactive alkali feldspar granite (alaskite) occurs as dykes within the Proterozoic granite gneiss around Dhanota. Samples have assayed 0.011 to 0.16% U 3 O 8 and 0.005 to 0.16% ThO 2 . Yttrium values range from 250 to 800 ppm. Uranothorite occurs in association with zircon, xenotime, magnetite, hematite, sphene and goethite. The U-Th-Y mineralisation in alaskites of Dhanota is disseminated syn-magmatic intrusive type.