Konkanhundi Pluton: A New Layered Basic Intrusion from Karnataka

Abstract Konkanhundi pluton is the first recorded occurrence of a layered basic intrusion in Karnataka. It is an oval shaped mass having an area of 50km2 and is composed mainly of layered gabbro with cumulates of gabbro, norite and anorthosite, arranged concentrically. Non-layered norites are also conspicuous. Rhythmic layering is ubiquitous and cumulus textures are not uncommon. The pluton is emplaced into the gneissic complex of the Archaean high grade terrain. Subsequent to emplacement, it has been deformed and metamorphosed. It is considered to be a magmatic intrusion emplaced under plutonic conditions.