Current Science

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Basalts occur as sub-alkaline tholeiites in the Naga ophiolite belt. They bear an E-MORB affinity ascribed to aqueous fluid addition from a dehydrating oceanic crust in a supra-subduction zone during the Indo-Burma plate collision. They are commonly altered to spilite. They exhibit relatively poor REE fractionation with almost flat chondrite-normalized patterns. Eu-anomalies are not prominent, indicating the negligible role of plagioclase fractionation in their petrogenesis. Rock magnetic studies suggest that magnetite is the major magnetic mineral in these Upper Cretaceous basalts.

Keywords

Basalt, Geochemistry, Petrography, Rock Magnetism.
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