Abstract
K-Ar dating of a set of flood basalts from eastern India indicates that volcanism ∼ 115 Ma ago was much more voluminous than heretofore recognised, covering an area of at least 2·10 5 km 2. Separation of India from Antarctica began ∼ 125 Ma ago and in this rift dominated regime, voluminous flood basalts were extruded with the Kerguelen Hotspot perhaps serving as the heat source. We report here on the occurrence of both alkali basalts and olivine tholeiites from the Rajmahal area; preliminary data indicate that more than one type of primary magma was present, one of which resulted from partial melting of a section of the mantle containing metasomatised veins.
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