Geochemistry of Rare Metal Bearing A-Type Dhanota Granite, Mahendragarh District, Haryana

The Proterozoic Dhanota granite has intruded the Delhi Supergroup in the North Delhi Fold Belt (NDFB). Geochemically, it is a silica-Rich, weakly paraluminous, sodic granite, enriched in high field strength elements (Zi, Nb, Y, Th) and Ga, with higher Ga/Al, Th/U and lower Ba/Rb ratios. The mineralogical and geochemical characters indicate the Dhanota granite as A-type, emplaced in an extensional/Non-Compressive tectonic regime around 665° C at pressure of 5 kb. The anorogenic nature of the Dhanota granite distinguishes it from the other syn-Orogenic, S-Type granitoid bodies emplaced in the NDFB.

Uranium-Thorium-REE mineralization as uranothorite and xenotime is recorded in the Dhanota granite. This together with its ocurrence in proximity to the U-Mineralized albitite line, and enrichment of HFS elements necessitate exploration for radioactive, rare metal and rare earth minerals in the area.