Abstract

Composition-paragenesis relationships in the North Siberian ultrabasic-alkalic complex, with a descriptive petrologic-petrographic analysis of the Gulya Pluton, the largest (2000 km2) and a most fully differentiated body of its kind in the world. The orderly successions of parageneses within the dunite-syenite series do not seem-to accord a stable position to melilitic rocks of the Gulya Pluton, however, in view of the interesting behavior of calcium; carbonatites of the Gulya Pluton complex appear to be products of a metasomatizing action of postrnagmatic solutions. — V.P. Sokoloff

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