Abstract

Forty-two samples of the Jogimardi trap from Chitaldrug schist belt, Mysore, were analysed for their major elements. It is inferred that the Jogimardi trap is a submarine lava flow of eugeosynclinal environment. The composition of the suite varies from tholeiitic basalt to andesite and spilite. The original magma, which was probably tholeiitic in nature, might have given rise to this association due to varying and incomplete degree of spilitisation, which in turn seems to be related to the short period of contact between metasomatic liquid and the tholeiitic flows.

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