International Journal of Earth Sciences and Engineering

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The petrographic and major element geochemical characteristics clearly suggest that the metavolcanic rocks of Medur Formation in the central part of the Dharwar-Shimoga greenstone belt comprise basalt, andesite, dacite and rhyolite (BADR) sequence. These metavolcanic rocks are metamorphosed to greenschist-amphibolite facies. The basalts show mixed tholeiitic and komatiitic composition. The andesites are mainly tholeiitic, while dacite and rhyolites are calc alkaline nature. Good correlation exists between SiO2 and major oxides, which suggests that these metavolcanic series (BADR) compositions are genetically inter-related and were derived probably from differentiation of magma at different depths.

Keywords

Metavolcanics, Petrography, Geochemistry, Dharwar-Shimoga Greenstone Belt, Dharwar Craton.
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