The Cretaceous-Paleogene magmatism of the Sredinnyi range of Kamchatka: Magma sources |
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| Authors: | G. B. Flerov V. A. Seliverstov |
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| Affiliation: | (1) Institute of Volcanology and Seismology, Far East Division, Russian Academy of Sciences, 9 Piipa Boulevard, Petropavlovsk-Kamchatskii, 683006, Russia;(2) The Earth Sciences Museum, Moscow State University, Moscow, 119899, Russia |
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| Abstract: | Based on published and new data, a new petrological model of the preorogenic Late Cretaceous-Paleogene intrusive rock association is suggested. The principle of plume geodynamics is the essential one: homodromous intrusion of dunite-clinopyroxenite-gabbro magmas into upper layers of the lithosphere results from melting of a nonuniform substratum of the upper mantle caused by an ascending fluid and containing a phosphorus-potassium component. Different rock series are of comagmatic character: basalt-trachybasalt-latite and gabbro-monzogabbro-syenite, evolving in the process of crystallization differentiation of the basalt magma influenced by transmagmatic fluid. We suggest a petrogenesis of high-potassic basalt series. |
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