COMPARATIVE ANALYSIS OF CONTINENTAL AND OCEANIC PLATEAU BASALTS (data on the Siberian Platform and Ontong Java Plateau)
V.V. Zolotukhin†, V.A. Simonov, A.I. Al'mukhamedov*, A.Ya. Medvedev*, and Yu.R. Vasil'ev
Institute of Geology, Siberian Branch of the RAS, 3 prosp. Koptyuga, Novosibirsk, 630090, Russia
* Institute of Geochemistry, Siberian Branch of the RAS, 1a ul. Favorskogo, Irkutsk, 664033, Russia
Keywords: Plateau basalts, Siberian Platform, Ontong Java Plateau, Nauru basin
Pages: 1293-1302
Abstract
Previous research has shown that the sections of the vast volcanogenic trap field of the Siberian Platform bear analogs of oceanic A- and C-G-type plateau basalts. Comparative analysis of volcanic rocks shows that basalts of the Siberian Platform and the Ontong Java Plateau are similar in composition and differ considerably from MORB. This suggests that the geodynamic processes that formed great volumes of magmas in the former two regions were similar and differed from the deep-level processes that occurred beneath MOR. Basalts of both the Siberian Platform and the Java Ontong Plateau might have resulted from the ascent of plumes that acted, most likely, by the mechanism of huge
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