Geochemistry and petrology of xenolith-bearing lamprophyres from Murud-Janjira, Raigarh Dist., Maharashtra, India

The N-S trending lamprophyre dykes from Murud-Janjira contain felsic and ultramafic xenoliths alongside unusually zoned clinopyroxene phenocrysts and xenocrysts that are found in an analcime base. On the basis of mineralogy and chemistry, the lamprophyres have been classified as monchiquites. The lamprophyres are probably emplaced along a system ef chasmic faults that are parallel to the West Coast arm of the Khambat triple junction. They may represent flank activity of the mid-ocean ridge anomaly and are the products of tlte waning stages of Deccan magmatism.