Petrological Study in the Northeastern India Ophiolite Belt

Investigations on cratonic and off-craton continental mantle lithosphere have been mainly focused on ultramafic xenoliths enclosed in kimberlite or alkali basalt lavas and/or orogenic iherzolite massifs, on the other hand, the abyssal peridotites collected from oceanic floor are believed to represent the modern oceanic lithospheric mantle. Ophiolite belts worldwide represent remnants of ancient oceanic lithosphere which escaped subduction. Mantle-derived xenoliths and alpine-type ultramafic massifs are the major source of information about the physical and chemical properties and processes of the uppermost mantle.