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1980•Journal of the Geological Society of IndiaRequires access

The Pavagarh Rhyolite

P. O. Alexander

Open publisher page 6 citations

Abstract

Initial strontium isotopic ratio for the Pavagarh rhyolite is reported. The ratio, 0.7111 is of the same order of magnitude as generally met for rhyolites of continental region. Compared to rhyolites that can truly be called derivates of magmatic differentiation of tholeiitic magma only, this ratio is considerably higher. Incompatible elements like Ba, Sr, Zr, Rb, Pb, Nb and Y are similarly enriched in the Pavagarh rhyolite. The data indicate that rhyolite of Pavagarh could not have originated as a result of closed-system magmatic differentiation of basaltic magma alone and significant incorporation of sialic material into the magma is suggested for its derivation.

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What this paper is about

Initial strontium isotopic ratio for the Pavagarh rhyolite is reported. The ratio, 0.7111 is of the same order of magnitude as generally met for rhyolites of continental region. Compared to rhyolites that can truly be called derivates of magmatic differentiation of tholeiitic magma only, this ratio is considerably higher. Incompatible elements like Ba, Sr, Zr, Rb, Pb, Nb and Y are similarly enriched in the Pavagarh rhyolite. The data indicate that rhyolite of Pavagarh could not have originated as a result of closed-system magmatic differentiation of basaltic magma alone and significant incorporation of sialic material into the magma is suggested for its derivation.

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Available abstract

Initial strontium isotopic ratio for the Pavagarh rhyolite is reported. The ratio, 0.7111 is of the same order of magnitude as generally met for rhyolites of continental region. Compared to rhyolites that can truly be called derivates of magmatic differentiation of tholeiitic magma only, this ratio is considerably higher. Incompatible elements like Ba, Sr, Zr, Rb, Pb, Nb and Y are similarly enriched in the Pavagarh rhyolite. The data indicate that rhyolite of Pavagarh could not have originated as a result of closed-system magmatic differentiation of basaltic magma alone and significant incorporation of sialic material into the magma is suggested for its derivation.

Key concepts: Rhyolite, Magma, Geology, Geochemistry, Basalt, Igneous differentiation, Volcano, Petrology

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