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Russian Geology and Geophysics

2005 year, number 9

MAGMATISM AND GEODYNAMICS OF THE PALEOASIAN OCEAN AT THE VENDIAN-CAMBRIAN STAGE OF ITS EVOLUTION

N.L. Dobretsov, V.A. Simonov, M.M. Buslov, and A.V. Kotlyarov
Institute of Geology, Siberian Branch of the RAS,
3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Paleoasian ocean, magmatism, geodynamics, ophiolites, melt inclusions
Pages: 933-951

Abstract

Comprehensive studies with the use of geological, petrologo-geochemical, and thermobarogeochemical methods have revealed specific features of the formation of Paleoasian ocean structures. Because of intense secondary alteration of rocks, it is especially important to analyze melt inclusions, which have retained the direct signature of ancient magmatic systems. Data on inclusions testify to the formation of boninites by crystallization of high-temperature (1330-1150