Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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Amphibolites of Precambrian age around Mathurapur occur in two distinct geologic settings i.e., (i) as discordant bodies associated with orthopyroxene-bearing gabbros (massive amphibolite) and (ii) as concordant bands following the general foliation direction (S2) of the gneissic country rock (schistose amphibolites). Both varieties of amphibolites have igneous parentage and have affinities with high alumina olivine . tholeiite magmatic liquid. The massive amphibolites have formed due to retrograde alteration of orthopyroxene gabbros. whereas, schistose amphibolites probably represent a separate metamorphosed basic magmatic phase in the area.
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