Geochemistry and Petrogenesis of Granite in Kundal Area, Malani Igneous Suite, Western Rajasthan

摘要

Kundal area from a part of the Malani Igneous Suite and consists of subvolcanic and volcanic rocks. Three major lithological units viz. extrusives, intrusives and dykes are exposed in this area. Kundal granites are low in Mg number, MgO, Fe_2O_3 (t), CaO, Sr and high in SiO_2, Na_2O, K_2O, Y and show both the LREE and HREE enriched patterns with large negative Eu anomalies suggestive of crustal origin. They are probably derived by low degrees of partial melting of pre-existing rocks of intermediate to felsic composition. The granites plot within the plate field of the discreminant diagrams, supporting an anorogenic tectonic setting for their emplacement.