Evaluation of the tectonic setting of precambrian dalma volcanic belt, eastern India, using major and trace element characters

Abstract

Geochemical characterisation of Dalma basalt, the upper member of a volcanic belt occupying the spine of a Precambrian basin, has been used to elucidate the eruptive environment. Dalma basalt in general is high magnesian in character as well as depleted in incompatible elements. The major and trace element distributions are strongly indicative of ocean-ridge magmatism with a feeble impression of arc volcanism. Such a transitional tectonic environment, corroborated by the overall geologic setting of the volcanic belt, is strongly indicative of a marginal basin situation during Proterozoic time in this part of the Indian shield.