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Russian Geology and Geophysics

2005 year, number 9

PHYSICOCHEMICAL PARAMETERS OF CONTINENTAL AND OCEANIC PLATEAU-BASALT MAGMATIC SYSTEMS ( from data on melt inclusions )

V.A. Simonov, S.V. Kovyazin, Yu.R. Vasil'ev, and J. Mahoney*
Institute of Geology, Siberian Branch of the RAS, 3 prosp. Akad Koptyuga, Novosibirsk, 630090, Russia
* School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, USA
Keywords: Melt inclusions, plateau basalts, Siberian Platform, Ontong Java Plateau
Pages: 886-903

Abstract

Based on new data on melt inclusions in minerals, the physicochemical and geochemical parameters of plateau-basalt magmatic systems of the Siberian Platform and Ontong Java, Pacific, have been established. The studied melts are enriched in Fe, which differs them from the magmatic melts of mid-ocean ridges (MOR). A comparative analysis of data on inclusions showed a similarity of continental and oceanic plateau-basalt magmatic systems, differing considerably from those of MOR and within-plate oceanic islands. Crystallization of oceanic plateau basalts took place at lower temperatures and pressures as compared with such rocks of the Siberian Platform. The data on inclusions evidence that the melts of the Siberian Platform and Malaita Island underwent a serious evolution in contrast to magmas of the Nauru Basin with more stable geochemical parameters. The most fractionated low-temperature high-Fe magmas with elevated contents of trace and rare-earth elements have been revealed for Malaita Island (Ontong Java Plateau).